14.7. MASTER BRAKE CILINDER

It is better that you do not recondition the master brake cylinder. If the master brake cylinder is broken or worn out, it is better to replace it with a new original one.
The removal of the master brake cylinder is as follows:

2CV:

- Loosen the two brake pipes turning the nipples and pulling out the pipes very carefully.
- Loosen the reservoir by turning it gently to the left or the right and tilt it. Collect the brake oil.
- Disconnect the throttle cable and the clutch cable from the pedals.
- Loosen the master brake cylinder by removing the 2 M9 bolts in the engine.
- Disconnect the wires from the brake light switch.
- Remove the pedals together with the master brake cylinder from inside the car.

Burton:

- Loosen the 2 brake pipes turning the nipples and pulling out the pipes very carefully.
- Loosen the reservoir by turning it gently to the left or the right and tilt it. Collect the brake oil.
- Disconnect the throttle cable and the clutch cable from the pedals.
- Disconnect the wires from the brake light switch.
- Loosen the master brake cylinder with the pedal support by removing the 2 M10 bolts by the pedals.

- Remove the left aluminium pedal support removing the 4 M6 bolts.
- Remove the pedals together with the master brake cylinder from inside the car.
- Loosen the master brake cylinder from the pedal bracket.
- Place the master brake cylinder back in the reverse order of removal.
- Set the throttle cable and the clutch cable to the pedal bracket and adjust it if necessary.
- Install the brake pipes with new rubber pipes for that type of brake oil. Remember that the brake pipes of the rear brakes go in the front hole and the brake pipes of the front brakes go in the rear hole (closest to the bulkhead).
- Check the tank for any cracks.
- Lubricate the reservoir rubbers with the proper brake oil and press the reservoir with your hand to the master brake cylinder. Fill the reservoir with the proper brake fluid. Vent the system (14.2).
- Check the margin of the pressure pin in the master brake cylinder, the pressure pin can be pressurized from 0.5 till 1 mm before it supports the master brake cylinder (see drawing).
- Check the pedal rubbers, they must be fitted very securely and may not be worn out. (APK= ‘Vehicle Testing Regulations’ requirement).
- Check the free stroke of the pedal when the brake is engaged, there must be enough margin to brake in an emergency.

If you have trouble reaching the pedals it is also possible to install a ‘short leg kit’, see chapter 5.8.

RELATED PARTS

>>Main brake cylinder LHM double original

>>Brake pipe rubber 3,5 mm LHM

>>Brake pipe between calipers, stainless steel

>>Brake fluid reservoir sealing per piece

>>Two section brake fluid reservoir LHM.