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Clutch System Vacuum Bleeding Guide

The document provides instructions for bleeding air from a vehicle's clutch system using a vacuum bleeding method. It lists the necessary equipment, which includes a vacuum source, rubber stopper, fitting, catch can and brake fluid. It describes inserting the rubber stopper into the master cylinder reservoir, pulling a vacuum to 25-28 inches while rapidly pumping the clutch pedal to break up any air bubbles, and potentially needing to repeat the process until no more air is seen.

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83 views1 page

Clutch System Vacuum Bleeding Guide

The document provides instructions for bleeding air from a vehicle's clutch system using a vacuum bleeding method. It lists the necessary equipment, which includes a vacuum source, rubber stopper, fitting, catch can and brake fluid. It describes inserting the rubber stopper into the master cylinder reservoir, pulling a vacuum to 25-28 inches while rapidly pumping the clutch pedal to break up any air bubbles, and potentially needing to repeat the process until no more air is seen.

Uploaded by

Mshibonium
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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CLUTCH SYSTEM BLEEDING

INSTRUCTIONS
If, during the course of the installation, you introduced air into the clutch system, the system
must be bled before attempting to drive the vehicle. The following procedure is the only way
to ensure that all air is bled from the system. Because the bleeder is approximately 4” above
the clutch slave cylinder, you will not be using the bleeder. The process you will be using is
known as vacuum bleeding.

What you will need:


• Vacuum source with gauge capable of pulling 25-30” Hg
• Rubber stopper at least 1.5” diameter at the large end
• Fitting to connect vacuum source to rubber stopper.
• A small can of new Dot3 brake fluid
• A catch can between the vacuum source and rubber stopper

Remove the cap from the brake master cylinder (the brakes and clutch use the same
reservoir). Place the rubber stopper (hooked to the vacuum source) over the opening in the
master cylinder. While holding the stopper flush against the opening, begin to pull a vacuum
in the system until the stopper is sealed. Continue to pull a vacuum to about 25-28” Hg. Get
inside the vehicle and rapidly pump the clutch pedal 25 – 30 times, making sure that the
pedal is allowed to return to the full up position each time. At this time, you should be able
to see a column of fluid in the hose between the stopper and the catch can. There should
be bubbles coming up through the column of fluid. If not, repeat the process of pumping the
clutch pedal rapidly (rapid pumping of the pedal breaks up the air so that it can be pulled out
of the system).

Depending on how much air you have in the system, you may need to pull a vacuum 3 or 4
times before you get all of the air out. Also, it is not uncommon for air to move overnight
requiring a bleed the next day. When done, replenish the fluid in the reservoir.

NOTE: Each time you are done pulling a vacuum, you must pump up both the clutch and
brake pedals. It is easier to pump up the brake pedal with the engine running. Failure to
pump up both pedals following a vacuum pull can result in serious injury or death.

clutchmasters.com Tech Line (909)877-6800

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