Notice: 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.
- 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. If the vehicle is equipped
with a ZF S6-650 transmission, use super DOT-4 hydraulic fluid GM P/N 88958860
(Canadian P/N 88901244).
- Press the clutch pedal in completely to the floor panel.
- 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.
- Close the bleeder and release the clutch pedal.
Important: Ensure no air is drawn into the clutch system.
- Repeat steps 2, 3, and 4 until all the air is out of the clutch system.
5.1. | Check and refill the reservoir as needed while bleeding. |
5.2. | After bleeding, pump the clutch pedal several times. If clutch engagement
is not satisfactory, repeat the bleed procedure. |
- If the previous procedures are unsuccessful, perform the following steps.
6.1. | Pump the clutch pedal very fast with full strokes for 30 seconds. |
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. |
6.3. | Repeat this procedure, as necessary. |