Removal

PROCEDURE
1. Disconnect negative (ground) cable from the battery and isolate cable.

Master Cylinder Fluid Level Sensor:

2. Disconnect vehicle wiring harness connector from brake fluid level sensor at base of master cylinder brake fluid reservoir.

Fig 7 Type 3 Primary And Secondary Output Ports. With ABS:

3. Disconnect primary and secondary brake tubes from master cylinder housing. Install plugs at brake tube outlets of master cylinder assembly.
4. Clean area where master cylinder attaches to booster using a suitable brake cleaner.

CAUTION: On ABS equipped vehicles, vacuum in power booster must be pumped down before removing master cylinder to prevent the booster from sucking in any contamination. This can be done simply by pumping the brake pedal, with the engine not running, until a firm brake pedal is achieved.

Master Cylinder Mounting To Vacuum Booster:

5. Remove the 2 nuts attaching master cylinder to power brake booster unit.
6. Slide master cylinder assembly straight out, and away from power brake booster unit.

Electrical Connections To HCU And Relay Box:

7. Disconnect the 6 way connector from the Hydraulic Control Unit (HCU) wiring harness and 10 way connector from the relay box located on the HCU.

Primary And Secondary Brake Tubes From Master Cylinder To HCU:

8. Remove the primary and secondary master cylinder brake tubes from the HCU.

Proportioning Valve Location On Hydraulic Control Unit:

9. Remove the chassis brake tubes from the proportioning valves and outlet ports of the (HCU).
10. Raise vehicle.

Hydraulic Control Unit Mounting Bracket:

11. Loosen and remove the 2 bolts attaching the HCU mounting bracket to the side of the front frame rail.
12. Lower vehicle.
13. Loosen and remove the bolts attaching the HCU mounting bracket to the top of the frame rail.
14. Remove HCU and its mounting bracket as an assembly from the vehicle.