ABS Only

CAUTION: After finishing work, check function of hydraulic control unit. Refer to Testing and Inspection.

- Installation:
Bleed brake system. Service and Repair

Procedure
- Switch off ignition.
- Disconnect battery ground wire.
- Remove air intake hose.
- M3 models:
If necessary, unfasten heating valves and pipes from brackets and press to one side.





- Draw brake fluid out of expansion tank with a suction bottle reserved for exclusive use with brake fluid.





- Unlock and pull off central connector.

NOTE: Keep brake fluid out of cable connector.





CAUTION: Do not interchange (confuse) brake leads and mark where appropriate.

- Unfasten brake leads (1 through 5) from hydraulic unit.
- Installation:
Pipe connections
1. front right
2. front left
3. rear axle
4. master brake cylinder V (front axle)
5. master brake cylinder H (rear axle)
Tightening torque, refer to Tightening. Specifications





- Pull suction hoses off elbow on pump body and catch escaping brake fluid.

NOTE: Suction hoses were only fitted until 09/94.





- Loosen retaining nut and lift hydraulic unit out of bracket.