L-SB-0069-09 June 2, 2009
Squawk/Bark Type Noise from Brake Actuator
Service
Category Brake
Section Brake Control/Dynamic Control System Market USA
Applicability
YEAR(S) MODEL(S) ADDITIONAL INFORMATION
2007 – 2009 LS460, LS600H
Introduction
Small amounts of air in the brake system may cause a squawk or bark type noise from the brake
actuator in some LS 460/460L and LS 600h vehicles. If present, this condition is most noticeable
when the vehicle is not moving and the brake pedal is depressed, or when coming to an abrupt stop.
Follow the procedures outlined in this bulletin to remove any residual air from the system that could
contribute to this condition.
This procedure should also be followed anytime the brake actuator assembly is replaced.
Refer to the video link below for an example of the squawk/bark noise condition:
LS Squawk/Bark Noise Example
Warranty Information
OP CODE DESCRIPTION TIME OFP T1 T2
BR9002 Special Brake Bleed Procedure 1.0 44050-50130 91 99
APPLICABLE WARRANTY
• This repair is covered under the Lexus Comprehensive Warranty. This warranty is in effect for
48 months or 50,000 miles, whichever occurs first, from the vehicle’s in-service date.
• Warranty application is limited to correction of a problem based upon a customer’s specific
complaint.
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Squawk/Bark Type Noise from Brake Actuator
Required Tools & Equipment
REQUIRED MATERIALS PART NUMBER QTY
SAE J1703 or FMVSS No.
Brake Fluid As Needed
116 DOT 3
Vinyl Tube for Brake Bleeder – 1
Clear Plastic Bottle (to Bleed Brake Fluid into) – 1
REQUIRED EQUIPMENT SUPPLIER PART NUMBER QTY
TIS Techstream*
ADE TSPKG1 1
NOTE: Software version 4.11.000 or later is required.
* Essential SST.
NOTE
Additional TIS Techstream units may be ordered by calling Approved Dealer Equipment (ADE) at
1-800-368-6787.
SPECIAL SERVICE TOOLS (SST’S) PART NUMBER QTY
GR8 Battery Diagnostic Station* 00002-MCGR8 1
* Essential SST.
NOTE
Additional SSTs may be ordered by calling 1-800-933-8335.
© 2009 Lexus, a division of Toyota Motor Sales, USA
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure Overview
The brake bleed procedure consists of 5 main sections:
• Section 1: Zero Down Accumulator Pressure (Zero Down)
This procedure is used to release the pressure from the accumulator prior to bleeding the brakes
(or replacing the brake actuator). Techstream is used for this procedure.
• Section 2: Disable Electronic Controlled Brakes (ECB Invalid)
This procedure, using Techstream, disables the ECB system temporarily to allow the front
brakes to be bled manually. Using Techstream to disable brake control causes the master
cylinder cut solenoid to turn OFF and the line from the master cylinder to front brake calipers to
open, allowing manual bleeding of the front brakes.
• Section 3: Front Brake Bleed — Manual Process
This is a two-man process in which one technician pumps and holds the brake pedal, while
another technician opens the right front bleeder screw to remove air from the system. The
same procedure is repeated for the left front.
• Section 4: Rear Brake Bleed
• Right Rear Brake Line Air Bleed
During this procedure, Techstream opens the solenoid for the right rear brake line and
then the accumulator pump runs during this process to push fluid and air out of the right
rear caliper bleeder valve. During this process, the brake pedal is NOT applied — the
accumulator pump will automatically pump fluid out of the right rear caliper bleeder valve.
This process bleeds the red brake line (suction line from the accumulator to the actuator)
and passes air out through the right rear caliper bleeder.
• Left Rear Brake Line Air Bleed
The left rear brake line is bled using a combination of the brake pedal being
pressed-and-held and the accumulator pump.
• Section 5: Reset Memory and Linear Valve Offset Calibration
The purpose of this step is to erase all previously memorized brake actuator linear valve
calibration values and to re-calibrate the brake actuator linear valves after all brake bleeding
procedures are finished. This procedure resets the memory of the skid control computer
and then performs the Linear Valve Offset Learning Process. During the Linear Valve Offset
Learning Process, the skid control computer memorizes the characteristics of the actuator
linear solenoids.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure
Section 1: Zero Down Accumulator Pressure (Zero Down)
IMPORTANT
• When the actuator is replaced, there is no pressure in the accumulator and the Zero Down
procedure is NOT necessary.
• If the actuator has just been replaced and no bleeding has yet been performed, DO NOT
connect accumulator connectors and press the "Engine Start/Stop" button to the ignition ON
position. (If the connectors are plugged in and the ignition is turned “ON”, pressure will be
built up in the accumulator.)
Press the "Engine Start/Stop" button to the ignition ON position, then start with “Section 2:
Disable Electronic Controlled Brakes (ECB Invalid)”.
This procedure releases pressure from the accumulator.
1. Connect a battery charger to maintain battery voltage.
2. Press the "Engine Start/Stop" button to the ignition ON position.
3. Using Techstream, navigate to the following menu:
ABS/VSC/TRAC
Figure 1.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 1: Zero Down Accumulator Pressure (Zero Down) (Continued)
4. Select the “Utility” menu.
Figure 2.
5. Select “ECB Utility”.
Figure 3.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 1: Zero Down Accumulator Pressure (Zero Down) (Continued)
6. Select “Zero Down” from the ECB Utility screen Figure 4..
and press “Next”.
7. Press “Next” to proceed. Figure 5..
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 1: Zero Down Accumulator Pressure (Zero Down) (Continued)
8. Confirm the conditions listed on Techstream and Figure 6..
press “Next”.
9. Press “Next” to proceed. Figure 7..
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 1: Zero Down Accumulator Pressure (Zero Down) (Continued)
10. Wait for the Zero Down process to finish and Figure 8..
press “Next”.
NOTE
The Zero Down process will take 20 seconds
to complete.
The Low Pressure beeper will sound at the end of
Zero Down to indicate the accumulator pressure
is low. This is normal.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 1: Zero Down Accumulator Pressure (Zero Down) (Continued)
11. STOP — DO NOT turn the ignition OFF and ON as instructed by Techstream. Just press “Next”.
Figure 9.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 1: Zero Down Accumulator Pressure (Zero Down) (Continued)
12. Once the “Zero Down” function is complete, press Figure 10..
“Exit”.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 1: Zero Down Accumulator Pressure (Zero Down) (Continued)
13. Navigate back to the ABS/VSC/TRAC utility menu, select “Data List”, then “Accumulator Sensor”,
and check accumulator pressure. Pressure should be approximately 0.5 volts.
Figure 11.
14. Press the "Engine Start/Stop" button to the ignition OFF position.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 1: Zero Down Accumulator Pressure (Zero Down) (Continued)
15. Disconnect both accumulator pump electrical connectors.
Figure 12.
1 Push Here to Disconnect LH Connector 2 Push Here to Disconnect RH Connector
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 2: Disable Electronic Controlled Brakes (ECB Invalid)
1. Press the "Engine Start/Stop" button to the ignition ON position.
2. Select “ECB Utility” from the Utility menu screen.
Figure 13.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 2: Disable Electronic Controlled Brakes (ECB Invalid) (Continued)
3. Select “ECB invalid” from the ECB Utility screen, Figure 14..
and press “Next”.
4. Press “Next” to proceed. Figure 15..
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 2: Disable Electronic Controlled Brakes (ECB Invalid) (Continued)
5. Confirm the conditions listed on Techstream and Figure 16..
press “Next”.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 2: Disable Electronic Controlled Brakes (ECB Invalid) (Continued)
6. STOP — DO NOT turn the ignition OFF as instructed by Techstream. Press “Next” — DO
NOT PRESS “Exit”.
Figure 17.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 3: Front Brake Bleed — Manual Process
NOTE
• Keep doors closed during bleeding.
• Ignition must be ON before starting this procedure.
1. Connect a clear vinyl tube to the FR (Front Right) Figure 18. .
bleeder screw.
2. Pump and hold pressure on the brake pedal while an assistant opens the bleeder screw.
NOTE
Make sure fluid level in reservoir does NOT fall below the low mark during this procedure.
3. When fluid/air bubbles stop coming out, tighten the bleeder screw and then release the brake
pedal.
4. Repeat steps 2 and 3 until all air is removed from the FR line.
5. Connect a vinyl tube to the FL (Front Left) bleeder screw.
6. Repeat steps 2 and 3 until all air is removed from the FL line.
7. Press the "Engine Start/Stop" button to the ignition OFF position.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 3: Front Brake Bleed — Manual Process (Continued)
8. Connect the accumulator pump electrical Figure 19. .
connectors.
9. Press the "Engine Start/Stop" button to the ignition ON position.
IMPORTANT
• Accumulator pressure must be approximately 0.5 volts before starting the rear brake
bleed procedure.
• You should NOT hear the accumulator pump motor run after the ignition is turned ON.
If the accumulator pump runs after ignition is turned ON, return to “Section 1: Zero Down
Accumulator Pressure”.
10. Check and adjust the brake fluid level to MAX. Figure 20. .
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed
1. Select “Air Bleeding” from the Utility menu screen. Figure 21..
2. Press “Next” from the Air Bleeding Utility screen. Figure 22..
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
3. Confirm the conditions listed on Techstream and Figure 23..
press “Next”.
4. Select “Actuator has been removed” and press Figure 24..
“Next”.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
5. STOP — DO NOT turn the ignition OFF as instructed by Techstream.
DO NOT unplug relays or disconnect accumulator connectors. Select “Next” — But DO NOT
turn the ignition OFF.
Figure 25.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
6. Press “Next” through the Techstream screens Figure 26..
concerning front brake bleed — front brakes have
already been manually bled in section 3.
7. Press “Next” through the FR (Front Right) and FL Figure 27..
(Front Left) brake bleed Techstream screens.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
8. Press “Next” through the FL brake bleed Figure 28..
Techstream screens.
9. Press “Next” at this screen since front brakes Figure 29..
have already been manually bled.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
10. Follow the instructions on Techstream and press Figure 30..
“Next”.
IMPORTANT
DO NOT press the brake pedal at this time.
A. Attach the vinyl tube and bottle.
B. Loosen the RR (Rear Right) bleeder screw.
NOTE
This step removes air from the RR (Rear
Right) line and actuator.
“Air Bleeding has failed” MESSAGE DISPLAYED
Figure 31.
If Techstream displays the message shown in
Figure 31:
• Repeat “Section 1: Zero Down Accumulator
Pressure”.
• Repeat “Section 2: Disable Electronic
Controlled Brakes”.
• Repeat “Section 3: Front Brake Bleed”,
except for manually bleeding front brake
circuits.
• Repeat “Section 4: Rear Brake Bleed”.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
11. DO NOT press the brake pedal. Figure 32..
During this step, Techstream opens the solenoid
in the actuator for the RR line and then runs the
accumulator pump.
NOTE
This step takes 30 seconds.
12. Tighten the bleeder screw and press “Next”. Figure 33..
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
13. Adjust the brake fluid level to MAX before bleeding Figure 34..
RL (Rear Left).
14. Follow instructions on Techstream for RL (Rear Figure 35..
Left) brake, then press “Next”.
NOTE
• Press and hold the brake pedal during RL
(Rear Left) brake bleeding.
• The accumulator pump will run when the
RL brake bleeder screw is opened.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
15. Wait for completion of operations listed on Figure 36..
Techstream, then press “Next”.
16. Wait for completion of operations listed on Figure 37..
Techstream, then press “Next”.
NOTE
Lowering accumulator pressure takes 20
seconds.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
17. Follow instructions on Techstream and press Figure 38..
“Next”.
NOTE
Techstream will instruct you to perform the
accumulator Zero Down procedure 4 times.
18. Press “Next” to proceed. Figure 39..
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
19. Follow instructions on Techstream and press Figure 40..
“Next”.
20. Press “Next” after cycling the ignition switch OFF Figure 41..
and then ON. Press “Next” AFTER the pump
motor stops running.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 4: Rear Brake Bleed (Continued)
21. Perform the “Zero Down” procedure 4 times, Figure 42..
per Techstream. At the end of the 4 “Zero
Down” procedures, the “Air bleeding is complete”
message will be displayed. Press “Exit”.
22. Check and adjust the brake fluid level to MAX. Figure 43..
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 5: Reset Memory and Linear Valve Offset Calibration
1. Select “Reset Memory” from the Utility menu screen.
Figure 44.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 5: Reset Memory and Linear Valve Offset Calibration (Continued)
2. Confirm the conditions listed on Techstream and Figure 45..
press “Next”.
3. Press “Next” to proceed. Figure 46..
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 5: Reset Memory and Linear Valve Offset Calibration (Continued)
4. Press “Exit”. Figure 47..
5. Select “ECB Utility” from the Utility menu screen.
Figure 48.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 5: Reset Memory and Linear Valve Offset Calibration (Continued)
6. Select “Linear Valve Offset” from the ECB Utility Figure 49..
screen and press “Next”.
7. Press “Next” to proceed. Figure 50..
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 5: Reset Memory and Linear Valve Offset Calibration (Continued)
8. Press “Next” to proceed. Figure 51..
9. Confirm the conditions listed on Techstream and Figure 52..
press “Next”.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 5: Reset Memory and Linear Valve Offset Calibration (Continued)
10. Press “Next” to proceed. Figure 53..
11. Techstream is now performing Linear Valve Figure 54..
Offset.
DO NOT depress the brake pedal at this time.
NOTE
This process takes 120 seconds.
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Squawk/Bark Type Noise from Brake Actuator
Repair Procedure (Continued)
Section 5: Reset Memory and Linear Valve Offset Calibration (Continued)
12. Press “Exit”. Figure 55..
13. Clear all stored DTCs.
14. Test drive vehicle to confirm NO warning lights illuminate and there are NO abnormal brake
concerns.
15. Verify the squawk/bark noise has been eliminated.
© 2009 Lexus, a division of Toyota Motor Sales, USA
