34 51 520 Removing and installing / replacing ABS hydraulic control unit
NOTE:
Note "General Information", Refer to 34 00... GENERAL DATA
CAUTION:
After finishing work:
Check function of hydraulic control unit.
Check function of hydraulic control unit.
Installation:
Bleeding brake system, refer to 34 00 047 BLEEDING BRAKE SYSTEM WITH ABS
Switch off ignition.
Disconnect battery negative lead.
Draw brake fluid out of expansion tank with a suction bottle reserved for exclusive use with brake fluid.
Unlock central connector (1) and pull off. Unfasten nut (2) and remove ground wire.
NOTE:
Keep brake fluid out of cable connector.
Unfasten brake lines.
CAUTION:
Do not mix up brake lines, mark before removing if necessary.
Installation:
- Line connections
- (F) from THZ circuit F to hydraulic control unit circuit F (front-axle circuit)
- (R) from THZ circuit R to hydraulic control unit circuit R (rear-axle circuit)
- (FR) from hydraulic control unit FR to front right wheel brake
- (FL) from hydraulic control unit FL to front left wheel brake
- (RA) from hydraulic control unit RA to rear-axle wheel brake
Tightening torque. Refer to BRAKES - TIGHTENING TORQUES
Unfasten screw and remove hydraulic control unit.