2010 Chevrolet Colorado
2010 BRAKES Drum Brakes - Canyon & Colorado
DIAGNOSTIC INFORMATION AND PROCEDURES
BRAKE DRUM DIAMETER MEASUREMENT
     Fig. 1: Measuring Brake Drum
     Courtesy of GENERAL MOTORS CORP.
 1. Clean the brake shoe lining contact surface of the brake drum with denatured alcohol or an equivalent
    brake cleaner.
 2. Using a brake drum micrometer calibrated in thousands of an inch, measure and record the largest
    diameter of the brake drum at 4 or more points, equally spaced around the drum.
     Ensure that the measurements are only taken within the brake shoe lining contact area and that the
     micrometer is positioned the same distance from the outside edge of the drum for each measurement.
 3. The maximum allowable diameter :
     Specification: Maximum allowable measurement 296.5 mm (11.673 in)
 4. If the largest diameter measurement of the brake drum is less than the maximum allowable diameter,
    the drum may be able to be resurfaced, depending upon surface and wear conditions which may be
    present.
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                                15:30:09         Page 1   © 2011 Mitchell Repair Information Company, LLC.
                                           2010 Chevrolet Colorado
                                   2010 BRAKES Drum Brakes - Canyon & Colorado
  5. If the largest diameter measurement of the brake drum is equal to or greater than the maximum
     allowable measurement, the drum requires replacement.
BRAKE DRUM SURFACE AND WEAR INSPECTION
Special Tools
J 8001 Dial Indicator Set, or equivalent
             WARNING: Refer to Brake Dust Warning .
Inspection
  1. With the brake drum removed, clean the braking (friction) surface of the brake drum with denatured
     alcohol or an equivalent approved brake cleaner.
  2. Inspect the braking surface of the brake drum for the following Braking Surface Conditions:
           Heavy rust and/or pitting
                Light surface rust can be removed with an abrasive disc; heavy surface rust and/or pitting must
                be removed by refinishing the drum.
            Cracks and/or heat spots
            Excessive blueing discoloration
            Missing balance weights
  3. If the braking surface of the brake drum exhibits one or more of the Braking Surface Conditions, the
     drum requires refinishing or replacement.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 2: Measuring Brake Drum
     Courtesy of GENERAL MOTORS CORP.
 4. Using a brake drum micrometer calibrated in thousands of an inch, measure and record any grooves
    present on the drum braking surface.
     Ensure that the measurements are only taken within the brake shoe lining contact area.
 5. Compare the groove, scoring, depth recorded to the following specification:
     Specification: Brake drum maximum allowable scoring 1.5 mm (0.06 in).
 6. If the brake drum scoring depth exceeds the specification, or if an excessive amount of scoring is
    present, the drum requires refinishing or replacement.
 7. Mount the brake drum on a brake lathe.
 8. Mount a dial indicator, J 8001 or equivalent, and position the indicator button so it contacts the
    braking surface of the brake drum at a 90 degree angle, approximately 19 mm (0.75 in) from the
    drum's outer edge.
 9. Measure and record the radial runout of the brake drum.
       1. Rotate the drum until the lowest reading is displayed on the indicator dial, then zero the dial.
       2. Rotate the drum until the highest reading is displayed on the dial.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
 10. Compare the radial runout of the brake drum to the following specification:
      Specification: Brake drum maximum allowable radial runout 0.15 mm (0.006 in).
 11. If the brake drum radial runout exceeds the specification, the drum requires refinishing or
     replacement.
DRUM BRAKE ADJUSTING HARDWARE INSPECTION
  1. Inspect the drum brake adjusting hardware for the following:
           Excessive corrosion
           Damaged or broken adjuster spring
           Damaged or broken adjuster lever
           Damaged or broken adjuster star wheel and or adjuster thread
  2. If components are found to be damaged, replace them.
REPAIR INSTRUCTIONS
BRAKE SHOE INSPECTION
Inspect the linings every 9,650 km (6,000 mi) and any time the wheels are removed (tire rotation, etc.).
Inspect the lining for wear by removing the brake drum. Replace the shoe and lining assemblies when the
thickness of any lining is worn within 0.72 mm (0.030 in) of the shoe. Replace riveted shoe and lining
assemblies when the lining is worn to within 0.76 mm (0.030 in) of any rivet head. Always replace shoe and
lining assemblies as a complete axle set.
BRAKE DRUM REPLACEMENT
Special Tools
J-42450-A: Wheel Hub Resurfacing Kit
Removal Procedure
          WARNING: Refer to Brake Dust Warning .
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation .
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 3: Brake Drum Retainers
     Courtesy of GENERAL MOTORS CORP.
 3. Remove and discard the brake drum retainers (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
      Fig. 4: Brake Drum
      Courtesy of GENERAL MOTORS CORP.
  4. Remove the brake drum (1).
  5. If the brake drum is difficult to remove, retract the brake shoes using the following procedure:
        1. Remove the rubber adjuster access hole plug located below the wheel cylinder on the rear brake
            backing plate.
        2. Insert a small, flat bladed tool through the access hole at a slight downward angle to contact the
            adjuster lever.
        3. Insert a second small, flat bladed tool straight into the access hole just above the first tool to
            contact the adjuster teeth.
        4. While applying slight inward pressure on the first tool, rotate the adjuster counter clockwise
            using the second tool against the adjuster teeth.
        5. Continue to rotate the adjuster until the brake shoes are retracted and the brake drum can be
            removed.
  6. Using the J-42450-A: Wheel Hub Resurfacing Kit, clean the brake drum and rear axle flange mating
     surfaces of any accumulated dirt or corrosion.
Installation Procedure
  1. Adjust the rear drum brakes. Refer to Drum Brake Adjustment.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
      Fig. 5: Brake Drum
      Courtesy of GENERAL MOTORS CORP.
  2. Install the brake drum (1).
  3. Install the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation .
BRAKE DRUM REFINISHING
Tools Required
J 41013 Rotor Resurfacing Kit. See Special Tools.
Refinishing
IMPORTANT: Do NOT refinish the brake drums in order to correct any of the following
           complaints:
                       Brake noise (growl/squeal)
                       Premature brake lining wear
                       Cosmetic or superficial corrosion of the drum braking surface
                       Drum discoloration
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
                Refinish the brake drums ONLY when 1 or more of the following conditions
                exist:
                       Severe scoring of the drum braking surface (groove depth in excess of
                       specification)
                       Brake pulsation caused by the following:
                            Brake drum out of round (runout in excess of specification)
                            Corrosion or pitting that is deeper than the drum braking surface
  1. Use a micrometer in order to measure the largest diameter of the brake drum. If the largest diameter of
     the brake drum exceeds the brake drum maximum refinish diameter, do NOT refinish the brake drum.
     Replace the brake drum.
  2. Use the J 41013 or an equivalent tool in order to THOROUGHLY clean the rust from the brake drum
     flange. See Special Tools.
  3. Refinish the brake drum. Refer to the brake lathe manufacturer's operating instructions.
      IMPORTANT: Failure to obtain the best possible braking surface finish may cause
                 the vehicle to stop with difficulty.
  4. After machining the brake drum, use 120 grit aluminum oxide sandpaper in order to create a non-
     directional braking surface.
  5. Clean the braking surfaces with GM P/N 12377981 (Canadian P/N 10953463) or equivalent brake
     parts cleaner.
BRAKE SHOE REPLACEMENT
Removal Procedure
         WARNING: Refer to Brake Dust Warning .
  1. Remove the brake drum. Refer to Brake Drum Replacement.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 6: Brake Shoe Adjuster Spring
     Courtesy of GENERAL MOTORS CORP.
 2. Remove the brake shoe adjuster spring (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 7: Brake Shoe Adjuster Lever
     Courtesy of GENERAL MOTORS CORP.
 3. Remove the brake shoe adjuster lever (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 8: Brake Shoe Adjuster Assembly
     Courtesy of GENERAL MOTORS CORP.
 4. Carefully spread the top of the brake shoes away from the wheel cylinder and remove the brake shoe
    adjuster assembly (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 9: Brake Shoe Hold Down Springs And Cups
     Courtesy of GENERAL MOTORS CORP.
 5. Remove the brake shoe hold down springs and cups (1) by compressing the springs inward and
    rotating the cups 1/4 turn.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 10: Forward Brake Shoe & Lower Retaining Spring
     Courtesy of GENERAL MOTORS CORP.
 6. Rotate the forward brake shoe (1) toward the rear axle flange.
 7. Remove the brake shoe lower retaining spring (2).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 11: Forward Brake Shoe
     Courtesy of GENERAL MOTORS CORP.
 8. Remove the forward brake shoe (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 12: Brake Shoe Upper Return Spring
     Courtesy of GENERAL MOTORS CORP.
 9. Remove the brake shoe upper return spring (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
      Fig. 13: Rear Brake Shoe And Park Brake Lever Assembly
      Courtesy of GENERAL MOTORS CORP.
 10. Release the park brake cable fitting (1) from the brake shoe park brake apply lever.
 11. Remove the rear brake shoe and park brake lever assembly (2)
 12. Remove the park brake lever from the brake shoe.
Installation Procedure
  1. Clean the rear brake backing plate brake shoe contact points.
  2. Apply a light coat of high temperature silicone brake lubricant to the rear brake backing plate brake
     shoe contact points.
  3. Install the park brake lever to the brake shoe.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 14: Rear Brake Shoe And Park Brake Lever Assembly
     Courtesy of GENERAL MOTORS CORP.
 4. Install the park brake cable fitting (1) to the brake shoe park brake apply lever and position the brake
    shoe (2) to the rear brake backing plate.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 15: Brake Shoe Upper Return Spring
     Courtesy of GENERAL MOTORS CORP.
 5. Install the brake shoe upper return spring (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 16: Forward Brake Shoe
     Courtesy of GENERAL MOTORS CORP.
 6. Install the forward brake shoe (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 17: Forward Brake Shoe & Lower Retaining Spring
     Courtesy of GENERAL MOTORS CORP.
 7. Rotate the forward brake shoe (1) toward the rear axle flange.
 8. Install the brake shoe lower retaining spring (2).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 18: Brake Shoe Hold Down Springs And Cups
     Courtesy of GENERAL MOTORS CORP.
 9. Install the brake shoe hold down springs and cups (1) by compressing the springs inward and rotating
    the cups 1/4 turn.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 19: Brake Shoe Adjuster Assembly
     Courtesy of GENERAL MOTORS CORP.
10. Carefully spread the top of the brake shoes away from the wheel cylinder and install the brake shoe
    adjuster assembly (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 20: Brake Shoe Adjuster Lever
     Courtesy of GENERAL MOTORS CORP.
11. Install the brake shoe adjuster lever (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 21: Brake Shoe Adjuster Spring
     Courtesy of GENERAL MOTORS CORP.
 12. Install the brake shoe adjuster spring (1).
 13. Adjust the rear brake shoes. Refer to Drum Brake Adjustment.
 14. Install the brake drum. Refer to Brake Drum Replacement.
REAR BRAKE BACKING PLATE REPLACEMENT
Removal Procedure
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the rear wheel speed sensor. Refer to Rear Wheel Speed Sensor Replacement .
  3. Remove the park brake cable from the rear brake backing plate. Refer to Parking Brake Rear Cable
     Replacement - Left Side or Parking Brake Rear Cable Replacement - Right Side .
  4. Remove the wheel cylinder. Refer to Rear Brake Cylinder Replacement.
  5. Remove the rear axle shaft. Refer to Rear Axle Shaft Replacement .
martes, 4 de septiembre de 2018 15:30:10        Page 24   © 2011 Mitchell Repair Information Company, LLC.
                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 22: Rear Brake Backing Plate Bolts
     Courtesy of GENERAL MOTORS CORP.
 6. Remove the rear brake backing plate bolts (1).
martes, 4 de septiembre de 2018 15:30:10        Page 25   © 2011 Mitchell Repair Information Company, LLC.
                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
      Fig. 23: Rear Brake Backing Plate
      Courtesy of GENERAL MOTORS CORP.
  7. Remove the rear brake backing plate (1).
Installation Procedure
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 24: Rear Brake Backing Plate
     Courtesy of GENERAL MOTORS CORP.
 1. Install the rear brake backing plate (1).
martes, 4 de septiembre de 2018 15:30:10        Page 27   © 2011 Mitchell Repair Information Company, LLC.
                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
       Fig. 25: Rear Brake Backing Plate Bolts
       Courtesy of GENERAL MOTORS CORP.
               CAUTION: Refer to Fastener Caution .
  2. Install the rear brake backing plate bolts (1) and tighten to 135 N.m (100 lb ft).
  3. Install the rear axle shaft. Refer to Rear Axle Shaft Replacement .
  4. Install the wheel cylinder. Refer to Rear Brake Cylinder Replacement.
  5. Install the park brake cable to the rear brake backing plate. Refer to Parking Brake Rear Cable
     Replacement - Left Side or Parking Brake Rear Cable Replacement - Right Side .
  6. Install the rear wheel speed sensor. Refer to Rear Wheel Speed Sensor Replacement .
DRUM BRAKE ADJUSTING HARDWARE REPLACEMENT
Removal Procedure
          WARNING: Refer to Brake Dust Warning .
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
 1. Remove the brake drum. Refer to Brake Drum Replacement.
 2. Fully retract the brake shoe adjuster by holding the adjuster lever away from the adjuster wheel and
    rotating the adjuster wheel counter clockwise.
     Fig. 26: Brake Shoe Adjuster Spring
     Courtesy of GENERAL MOTORS CORP.
 3. Remove the brake shoe adjuster spring (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 27: Brake Shoe Adjuster Lever
     Courtesy of GENERAL MOTORS CORP.
 4. Remove the brake shoe adjuster lever (1).
martes, 4 de septiembre de 2018 15:30:11        Page 30   © 2011 Mitchell Repair Information Company, LLC.
                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
      Fig. 28: Brake Shoe Adjuster Assembly
      Courtesy of GENERAL MOTORS CORP.
  5. Carefully spread the top of the brake shoes away from the wheel cylinder and remove the brake shoe
     adjuster assembly (1).
Installation Procedure
  1. Disassemble the brake shoe adjuster assembly and clean the adjuster screw thread.
  2. Apply a light coat of high temperature silicone brake lubricant to the adjuster screw threads.
  3. Assemble the brake shoe adjuster assembly and position the adjuster screw to the fully retracted
     position.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 29: Brake Shoe Adjuster Assembly
     Courtesy of GENERAL MOTORS CORP.
 4. Carefully spread the top of the brake shoes away from the wheel cylinder and install the brake shoe
    adjuster assembly (1).
martes, 4 de septiembre de 2018 15:30:11        Page 32    © 2011 Mitchell Repair Information Company, LLC.
                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 30: Brake Shoe Adjuster Lever
     Courtesy of GENERAL MOTORS CORP.
 5. Install the brake shoe adjuster lever (1).
martes, 4 de septiembre de 2018 15:30:11         Page 33   © 2011 Mitchell Repair Information Company, LLC.
                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 31: Brake Shoe Adjuster Spring
     Courtesy of GENERAL MOTORS CORP.
  6. Install the brake shoe adjuster spring (1).
  7. Adjust the rear brake shoes. Refer to Drum Brake Adjustment.
  8. Install the brake drum. Refer to Brake Drum Replacement.
REAR BRAKE CYLINDER REPLACEMENT
Removal Procedure
         WARNING: Refer to Brake Dust Warning .
  1. Remove the rear brake shoes. Refer to Brake Shoe Replacement.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 32: Brake Pipe Fitting
     Courtesy of GENERAL MOTORS CORP.
 2. Disconnect the brake pipe fitting (1) from the wheel cylinder.
     Cap the brake pipe fitting and plug the wheel cylinder inlet port to prevent brake fluid loss and
     contamination.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 33: Wheel Cylinder Bolts
     Courtesy of GENERAL MOTORS CORP.
 3. Remove the wheel cylinder bolts (1).
martes, 4 de septiembre de 2018 15:30:11        Page 36   © 2011 Mitchell Repair Information Company, LLC.
                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
      Fig. 34: Wheel Cylinder
      Courtesy of GENERAL MOTORS CORP.
  4. Remove the wheel cylinder (1).
Installation Procedure
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 35: Wheel Cylinder
     Courtesy of GENERAL MOTORS CORP.
 1. Install the wheel cylinder (1).
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 36: Wheel Cylinder Bolts
     Courtesy of GENERAL MOTORS CORP.
               CAUTION: Refer to Fastener Caution .
 2. Install the wheel cylinder bolts (1) and tighten to 18 N.m (13 lb ft).
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                                        2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
      Fig. 37: Brake Pipe Fitting
      Courtesy of GENERAL MOTORS CORP.
  3. Connect the brake pipe fitting (1) to the wheel cylinder and tighten to 19 N.m (14 lb ft).
  4. Install the rear brake shoes. Refer to Brake Shoe Replacement.
  5. Bleed the wheel cylinder. Refer to Hydraulic Brake System Bleeding (Pressure) .
DRUM BRAKE ADJUSTMENT
Special Tools
J 21177-A Drum to Brake Shoe Clearance Gauge. See Special Tools.
          WARNING: Refer to Brake Dust Warning .
NOTE:           The rear brakes must be adjusted manually after replacing the rear brake
                shoes.
Adjustment
martes, 4 de septiembre de 2018 15:30:11           Page 40   © 2011 Mitchell Repair Information Company, LLC.
                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 38: View Of Rear Brake Drum
     Courtesy of GENERAL MOTORS CORP.
 1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
 2. Loosen the adjuster nut for the park brakes.
 3. Remove the brake drum. Refer to Brake Drum Replacement.
martes, 4 de septiembre de 2018 15:30:11        Page 41   © 2011 Mitchell Repair Information Company, LLC.
                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 39: Measuring Brake Drum
     Courtesy of GENERAL MOTORS CORP.
 4. Using the J 21177-A (1), measure the inside diameter of the brake drum. See Special Tools.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
     Fig. 40: Adjusting Rear Brake Shoes
     Courtesy of GENERAL MOTORS CORP.
      NOTE:           When performing the following service procedure, ensure that the J
                      21177-A (1) is level, before taking the measurement. See Special Tools.
 5. Using the J 21177-A (1), adjust the brakes shoes until there is approximately 0. See Special Tools.76
    mm (.030 in) clearance between the rear brake shoes and the rear brake drum.
martes, 4 de septiembre de 2018 15:30:11        Page 43    © 2011 Mitchell Repair Information Company, LLC.
                                         2010 Chevrolet Colorado
                                 2010 BRAKES Drum Brakes - Canyon & Colorado
       Fig. 41: View Of Rear Brake Drum
       Courtesy of GENERAL MOTORS CORP.
  6.   Install the brake drum.
  7.   With heavy force, apply the brake pedal 2 times in order to center and adjust the brake shoes.
  8.   Inspect the drums again for light drag. If necessary, repeat the previous step for adjusting the brakes.
  9.   Lower the vehicle. Refer to Lifting and Jacking the Vehicle .
 10.   Adjust the park brake. Refer to Parking Brake Adjustment .
DESCRIPTION AND OPERATION
DRUM BRAKE SYSTEM DESCRIPTION AND OPERATION
System Component Description
The drum brake system consists of the following:
Drum Brake Shoes
       Applies mechanical output force (from hydraulic brake wheel cylinders) to friction surface of brake
       drums.
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
Brake Drums
      Uses mechanical output force applied to friction surface from drum brake shoes to slow speed of tire
      and wheel assembly rotation.
Drum Brake Hardware
      Secures drum brake shoes firmly in proper relationship to hydraulic brake wheel cylinders. Enables
      sliding motion of brake shoes needed to expand toward friction surface of drums when mechanical
      output force is applied; provides return of brake shoes when mechanical output force is relieved.
Drum Brake Adjusting Hardware
      Provides automatic adjustment of brake shoes to brake drum friction surface whenever brake apply
      occurs during rearward motion of the vehicle.
System Operation
Mechanical output force is applied from the hydraulic brake wheel cylinder pistons to the top of the drum
brake shoes. The output force is then distributed between the primary and secondary brake shoes as the
shoes expand toward the friction surface of the brake drums. The brake shoes apply the output force to the
friction surface of the brake drums, which slows the rotation of the tire and wheel assemblies. The proper
function of both the drum brake hardware and adjusting hardware is essential to the proper distribution of
braking force.
SPECIAL TOOLS AND EQUIPMENT
SPECIAL TOOLS
                   Illustration                                Tool Number/ Description
                                                                      J 21177-A
                                                          Drum to Brake Shoe Clearance Gauge
                                                                         J 41013
                                                                  Rotor Resurfacing Kit
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                                       2010 Chevrolet Colorado
                               2010 BRAKES Drum Brakes - Canyon & Colorado
                                                                   J 42450-A
                                                            Wheel Hub Resurfacing Kit
                                                                       J 8001
                                                                 Dial Indicator Set
martes, 4 de septiembre de 2018 15:30:11        Page 46   © 2011 Mitchell Repair Information Company, LLC.