MASTER CYLINDER
Description
The master cylinder is mounted inside the engine com-partment on the rear bulkhead.
When pressure is applied to the brake pedal, the piston moves down the cylinder bore compressing the piston return spring against the centre valve and closes the seal onto the feed port cutting off the supply of fluid from the master cylinder reservoir. Continued movement of the piston forces the fluid out of the pressure port through the servo unit to the front calipers and rear wheel cylinders and also keeps the centre valve hard on the feed port.
On the return stroke, the piston moves back along the cylinder bore and with the final movement of the piston lifts the centre valve off the feed port thus permitting the free flow of fluid between the master cylinder and its fluid reservoir.
To remove and refit
1. Destroy all vacuum in the servo unit by repeated operation of the brake pedal, otherwise difficulty will be experienced in completely expelling the air from the hydraulic system. DO NOT start the engine before bleeding the system has been completed.
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2. Disconnect the pressure pipe from the master cylinder by releasing the union nut and trapping any escaping fluid in a drip tray.
3. Remove the pedal return spring cap from the master cylinder push rod by moving it forward away from the pedal lever and sliding the cap off the push rod.
4. Identify the position of the clevis pin in the pedal lever and detach the master cylinder push rod from the pedal lever by removing the spring clip, washer and withdrawing the clevis pin.
5. Remove the master cylinder and distance piece from the rear bulkhead inside the engine compartment by removing two nuts, washers and bolts which pass through the mounting flange and collect the pedal return spring from inside the car.
6. Refitting Is the reverse of the removal sequence but particular attention must be given to the following:
(i) The pedal lever has two push rod clevis pin holes and the push rod must be returned to its original position.
(ii) The pedal lever is held rearwards, the pedal return spring is compressed while the spring cap is fed over the master cylinder push rod so its recessed face accommodates the forkend of the push rod.
(iii) Bleed the hydraulic system of air, see under "Bleeding the hydraulic system".
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