Withdrawal
Drain the brake fluid.
Disconnect the brake pipes from the master brake cylinder.
Disconnect the brake fluid level sensor.
Remove the rear brake pressure regulator bracket.
Remove the brake master cylinder assembly.
Remove the vacuum hose (4).
Remove the spring clip.
After removing the cotter pin, remove the axle (2) fastening the fork to the pedal.
Loosen the four nuts (3) and remove the vacuum brake booster (1).
Elements of the main brake cylinder (early car models)
1 - body;
2 - piston of the first chamber;
3 - piston of the second chamber;
4 - retaining ring;
5 - shield;
6 - vacuum amplifier;
7 - expansion tank.
Installation
Installation is carried out in the reverse order, taking into account the following:
Adjust the gap between the pusher of the vacuum brake booster and the piston.
A=B-C-D=0,7±0,1mm.
If the clearance does not correspond to the nominal value, adjust it by changing the length of the pusher by turning the adjusting screw of the pusher (arrow)