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70 BRAKES 4 REPAIR PRESSURE REDUCING VALVE (PRV) Service repair no - 70.25.21 Remove 1. Disconnect battery. brake fluid. 4. Disconnect primary circuit pipe unions æAæ from valve. 5. Disconnect secondary circuit pipe unions æBæ from valve. 6. Cover pipes to prevent ingress of dirt. valve to engine bulkhead. 8. Remove valve. Refit 9. Fit valve to engine bulkhead. Tighten bolt to 15 Nm (11 lbf/ft). 10. Connect primary and secondary circuit pipes to valve. Tighten to 16 Nm (12 lbf/ft). 11. Fill brake reservoir with recommended brake fluid See LUBRICANTS, FLUIDS AND CAPACITIES, Information, Recommended 12. Bleed the brake system See Brake system bleed . 13. Reconnect battery and road test vehicle. SERVO NON RETURN VALVE Service repair no - 70.50.15 Remove 1. Disconnect brake vacuum hose from servo non return valve. 2. Carefully prise valve out with a screwdriver blade between valve and grommet. Take care not to 3. Remove rubber grommet but be careful not to allow it to fall into the vacuum chamber. 4. Check the valve for correct operation; it should not be possible to pass air through into the servo Refit 5. Fit rubber grommet. grease to assist assembly, and push valve fully 7. Connect vacuum hose to the valve. |