Valve block (ABS) - removal and refitting

Caution: Refer to the precautions in Section 1.

Removal
1 Disconnect the battery negative lead.

2 Depressurise the hydraulic system by pumping the brake pedal at least 20 times, or until it becomes hard.

3 Apply the handbrake, and slacken the left-hand front wheel nuts. Jack up the front of the vehicle and support on axle stands (see Jacking and Vehicle Support).Remove the left-hand front wheel.

4 Remove the plastic liner from under the wheel arch.

5 Prepare a suitable container to catch spilt fluid, clean around the unions on the valve block, then unscrew and disconnect the fluid pipes (see illustration). Plug the open ends of the pipes and valve block to prevent fluid leakage and dirt ingress. If fluid is accidentally spilt on the paintwork, wash off immediately with cold water.

20.5 Valve block and associated components - ABS
20.5 Valve block and associated components - ABS

A Bracket screws
B Adapter plate
C valve block
D Multi-plug
E Earth strap anchor point

6 Disconnect the multi-plug and the earth strap from the valve block.

7 Working through the wheel arch, unscrew the three nuts which secure the valve block mounting bracket (see illustration).

20.7 Unscrewing the valve block mounting bracket nuts (arrowed) - ABS
20.7 Unscrewing the valve block mounting bracket nuts (arrowed) - ABS

8 Remove the valve block and mounting bracket, taking care not to spill brake fluid on the paintwork.

9 No further dismantling of the valve block is possible, but the pressure regulating valve in the rear brake pipe union can be renewed if desired.

Refitting
10 Refitting is a reversal of removal.

11 On completion, bleed the complete hydraulic system and check for leaks around all disturbed components.

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