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Hydraulic Clutch Bleeding

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: DO NOT use fluid which has been bled from a hydraulic clutch system, in order to fill the clutch master cylinder reservoir; due to the possibility that the fluid may be aerated, have too much moisture content or be contaminated and may cause system or vehicle damage.
  1. Ensure the reservoir is filled to the fill line with new hydraulic clutch fluid. Add fluid if required. Use hydraulic clutch fluid GM P/N 12345347 (Canadian P/N 10953517) or equivalent.
  2. Press the clutch pedal in completely to the floor panel.
  3. Open the bleeder screw in order to purge the air from the system. If equipped with a NV 3500 or NV 4500 transmission, the bleeder is located on the clutch actuator cylinder, if equipped with a ZF S6-650 transmission the bleeder is located on the master cylinder housing.
  4. Close the bleeder and release the clutch pedal.
    IMPORTANT: Ensure no air is drawn into the clutch system.
  5. Repeat steps  2,  3, and  4 until all the air is out of the clutch system.
    1. 5.1. Check and refill the reservoir as needed while bleeding.
    2. 5.2. After bleeding, pump the clutch pedal several times. If clutch engagement is not satisfactory, repeat the bleed procedure.
  6. If the previous procedures are unsuccessful, perform the following steps.
    1. 6.1. Pump the clutch pedal very fast with full strokes for 30 seconds.
    2. 6.2. Stop pumping and let the air escape into the reservoir while moving the rubber pad up and down 12 mm (0.5 in) for 30 seconds.
    3. 6.3. Repeat this procedure as necessary.
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