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Pressure-control relief valve (non-ABS models) - removal and refitting
Braking system / Pressure-control relief valve (non-ABS models) - removal and refitting


Removal
1 On non-ABS models, the two pressurecontrol relief valves (sometimes referred to as pressure-conscious reducing valves) are located on the master cylinder outlets to the rear brake line circuits.

2 Unscrew and remove the fluid reservoir filler cap, and draw off the fluid - see Section 11.

3 Position some rags beneath the master cylinder, to catch any spilled fluid.

4 Clean around the valve to be removed.

Hold the PCR valve stationary with one spanner, and unscrew the hydraulic pipe union nut with another spanner. Pull out the pipe, and bend it slightly away from the valve.

5 Unscrew the PCR valve from the master cylinder.

6 Note that the primary and secondary PCR valves have different thread diameters, to prevent incorrect fitment. The primary valve has a 12 mm diameter thread, and the secondary valve has a 10 mm diameter thread (see illustration).

18.6 Pressure-control relief valve locations
18.6 Pressure-control relief valve locations

1 Primary PCR valve (12 mm) 2 Secondary PCR valve (10 mm)

Refitting
7 Refitting is a reversal of the removal procedure. On completion, bleed the hydraulic system as described in Section 15.


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