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#1652 - 11/06/06 02:49 PM Improved Bleeding Procedure for Hydraulic Clutch  
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Subject: Info - Improved Bleeding Procedure for Hydraulic Clutch Release System #01-07-31-002B - (11/01/2006)

Models: 2007 and Prior GM Passenger Cars and Light Duty Trucks (including Saturn)

This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 01-07-31-002A (Section 07 -- Transmission/Transaxle).

This bulletin is being issued to inform dealers of an improved procedure to aid in the ease of bleeding the clutch hydraulic system for the above listed vehicles. This procedure can be used anytime air is introduced into the hydraulic system.
Following this procedure may also reduce the number of unnecessary parts replaced for low clutch pedal reserve and high shift effort.

Verify that all the lines and fittings are dry and secure.
Clean the dirt and grease from the reservoir cap in order to ensure that no foreign substances enter the system.
Remove the reservoir cap.
Fill the reservoir to the proper level with the required fluid.
Attach the J 43485 (Adapter) to the J 35555 (Mity Vac), or equivalent.

Important: Brake fluid will deteriorate the rubber on J 43485. Use a clean shop cloth to wipe away the fluid after each use.

Place and hold the adapter on the reservoir filler neck to ensure a tight fit. In some cases, the adapter will fit into the reservoir opening.
Apply a vacuum of 51-68 kPa (15-20 hg) and remove the adapter.
Refill the reservoir to the proper level.
Repeat Steps 6 and 7 until fluid is clean

If needed, refill the reservoir and continue to pull a vacuum until no more bubbles can be seen in the reservoir or until the fluid level no longer drops.

Caution: The vehicle will move if started in gear before the Actuator Cylinder is refilled and operational. Start the vehicle the first time in neutral to help prevent personal injury from vehicle movement and see if the transmission will shift easily into gear.

Pump the clutch pedal until firm (to refill actuator cylinder).
Add additional fluid if needed.
Test drive vehicle to ensure proper operation.


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#1653 - 12/22/06 04:02 PM Re: Improved Bleeding Procedure for Hydraulic Clutch  
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Here is a minivac that I modified to allow getting pressure into the system to allow for a better draining of fluids under pressure
This allows a valve installed inline to be closed, then can pump up the pressure in the minivac bottle to pressure you want and then when valve is opened the fluids are sucked out without getting air into the fluid lines

[Linked Image]


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#1654 - 12/29/06 03:44 PM Re: Improved Bleeding Procedure for Hydraulic Clutch  
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By allowing the minivac to get under pressure then when opening the pressure valve it sucks the crap out of whatever your wanting to purge out and lesson getting air into the system

This is what was sucked out of a C5's master for clutch

[Linked Image]


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