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BRAKING SYSTEM . . ... ... .. . ... : BRAKES DESCRIPTION The mechanical components of the Land Rover 90 and 110 braking system consist of single cylinder Girling drum brakes at the rear and Lockheed, four piston controlled handbrake is a mechanically operated single drum on the output shaft of the transfer box and is completely independent of the main braking system. Adjustment of all drum brakes is by a snail cam turned by a square peg on the back-plates. The basic hydraulic system involves two separate and 50 direct acting servo, is fed by a divided fluid reservoir. The rear section contains fluid Land Rover 90 models have a brake fluid loss switch fitted to the master cylinder filler cap. The switch is wired to a warning lamp bulb on the drivers control panel and the bulb will illuminated momentarily when is functioning correctly. A hydraulic failure in the primary o r secondary circuits will result in fluid loss and cause the warning bulb to illuminate, in such an event, the driver must stop the vehicle In some territories, alternative and additional switches and Land Rover 110 models have a Pressure Differential brakes. braking classification regulations prevailing in the territory to operate. Both types of valve incorporate an electrical switch wired to a bulb on the vehicle control panel. The bulb will illuminate in either the primary or secondary circuits is evident if the warning bulb illuminates upon application of the foot brake while the engine is running. Should a pressure failure occur in the front brake circuit (secondary) the piston in the P.D.W.A. move in the diretion of the failed circuit causing the switch to operate and the warning bulb to in the . primary circuit to the rear brakes will continue. The 80 vacuum servo is fitted when a combination valve is used. The P.C.R. valve allows fluid to the rear brakes until a predetermined pressure is reached when the valve closes. the valve, from this point on, will only permit a of any increase in fluid pressure to reach rear brakes to prevent premature locking of the rear of the valve will ensure that the fluid to the rear brakes will by-pass the valve and allow full circuit pressure to the rear wheel cylinder. To satisfy the demand of other regulations certain vehicles are equipped with a deceleration actuated instead of a P.C.R. valve. Then this valve is used a Girling type 80 vacuum servo is fitted. The valve is situated on the inner face of the chassis right-hand side an angle of 20" to the horizontal so that the angle of inclination is towards the front of the vehicle. Under normal braking conditions the valve remains passive. When fierce or emergency braking is necessary of increase in the hydraulic pressure to the wheel cylinders. A. Primary circuit. Secondary circuit. or combination valve. 1 |