Gilera 633721 Workshop Manual page 322

Braking system
Rear - combined
To bleed the integral system, first bleed the rear
break calliper.
- Remove the rubber cap from the bleed screw and
insert a rubber pipe to recover the brake fluid.
- With the left-had brake lever, load the system and
bring it up to the required pressure.
- Keeping the left-hand brake lever pulled, loosen
the bleed screw to purge the air. Then tighten the
bleed screw.
- Repeat the operation until only brake fluid comes
out of the rubber pipe.
- Then repeat the bleed operations for both the
regulating valve and the front left calliper.
- To access the regulating valve, it is necessary to remove the front shield.
- Top up the brake fluid to the right level in the tank.
N.B.
DURING THE BLEEDING OPERATIONS, MAKE SURE THE BRAKE FLUID DOES NOT COME INTO
CONTACT WITH THE BODYWORK SO AS NOT TO DAMAGE IT. FURTHERMORE, DURING THE
BLEEDING OPERATIONS REGARDING THE BRAKE CALLIPERS, MAKE SURE THE BRAKE
FLUID DOES NOT COME INTO CONTACT WITH THE DISC BRAKES AND WITH THE BRAKE
PADS. FAILURE TO COMPLY WITH THIS NORM WILL ENDANGER THE PROPER WORKING AND
EFFICIENCY OF THE BRAKING SYSTEM
If necessary, bleeding can be done using a special vacuum pump
Specific tooling
020329Y MityVac vacuum-operated pump
Locking torques (N*m)
BRAK SYS - 322
Nexus 500 euro 3