Remove the reservoir from the master cylinder.
Remove the plug from the brake light switch.
Remove all brake lines near the master cylinder without exception.
If necessary, unscrew the nuts connecting the brake master cylinder and the brake booster. Remove the brake master cylinder.
When assembling, insert a new sealing ring between the brake booster and the brake master cylinder.
Wet the seal on the reservoir connection pipe inside with brake fluid before putting it on the reservoir nipple.
Bleed the brake system.
The figure shows the parts of the master brake cylinder (5) and the brake booster (7): 1 - rack; 2 - safety bracket; 3 - locking pin; 4 - fork; 6 - sealing ring; 8 - pusher
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