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Dual circuit braking system
A dual line braking system was fitted to later cars. A tandem master
cylinder is fitted for use with the dual line system.
The master cylinder incorporates a pressure failure switch, the
purpose of which is to provide a visual warning of front or rear brake
failure caused by pressure loss. Pressure generated in the master
cylinder passes either side of a shuttle valve, which under normal
conditions remains stationary. A pressure failure in either the front or
rear circuits causes the shuttle valve to move and actuate the switch.
This completes and electrical circuit which operates a warning light on
the dash panel, located between the speedometer and the
combination gauge. The warning light includes a test switch that can
be manually operated to test the circuit and the bulb operation.
Repairs and maintenance of the dual circuit system are the same as
for the single line system with the exception of the pressure release
valve, not fitted to the earlier cars.
The hydraulic system pressure reducing valve is fitted to stop the rear
wheels locking prematurely under heavy braking. In the event of front
hydraulic failure the valve allows full pressure to operate the rear
brakes.
The valve is fitted to a bracket on the right-hand chassis main rail
below the drivers' foot well.
To remove
1. Disconnect the brake fluid pipes from the valve and plug to
avoid leakage/ dirt ingress.
2. Remove the single set screw securing the valve to the
chassis bracket and withdraw the valve.
Replace in reverse order
Figure 8 Dual circuit braking system
1. Master cylinder 10. R/H bundy link pipe 19. Set screw
2. Pressure reducing valve 11. Front flexible hose 20. Lock washer
3. Bolt 12. Lock nut 21. Nut
4. Lock washer 13. Lock washer 22. L/H rear brake bundy pipe
5. Nut 14. Wheel cylinder link bundy pipe 23. R/H rear brake bundy pipe
6. Set screw 15. Clip 24. Bundy clip
7. Primary bundy pipe 16. PRV to rear circuit bundy pipe 25. Bundy clip
8. Secondary bundy pipe 17. Rear flexible hose 26. Bundy to axle clip
9. L/H bundy link pipe 18. 3-way connector
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