GENERAL
30 - 14
30Braking system purging
The air existence in the hydraulic circuit may be noticed by an elastic displacement of the brake
pedal, sometimes even, close to the floor. This fact is more evident with the engine running.
GENERAL RE COM M E NDATIONS
· Always use for completion or total changing the brake fluid SAE J 1703 , DOT 4.
· In case of changing the brake fluid it is necessary to wash the system with industrial alcohol.
· During the purging, the brake fluid from the reservoir must not go down bellow the MINIM
level marked on the reservoir.
To perform the purging, one person will stay on the driver place, to press the brake pedal and
the other one will perform t he purging at purging points, using a 500 ml vessel, a tra nsparent
plastic tube and brake fluid for completion.
REMARK:
The brake fluid obtaine4d during performing the purging operation IS NOT TO BE
REUSED, but after 48 hours, to avoid air bubbles introduction in the hydraulic circuit.
PR OCED UR E
Place on the purging screw, a transparent tube with its end in a vessel with brake fluid a nd
proceed as follows : - press the brake pedal slowly;
- dismount the bleeding screw, maintaining the full stroke of the pedal;
- tighten the bleeding screw;
- slowly release the brake pedal.
Repeat the same procedure until complete cease of bubbles.
Pr oceed in the same way also for the other purging places.
T ake into consideration the existence all the time of the brake fluid in the reservoir.
OBSERVATION : Before beginning the purging procedure, dismount the I.C.P. contact
from the brake pump that it will be remounted at the end of the operation, brake pedal released.
It is important to observe the following sequence of the purging points:
1.Main brake cylinder;
2. Left rear wheel brake cylinder;
3. Right rear wheel brake cylinder ;
4. Caliper of front right wheel ;
5. Caliper of front left wheel;
6. By-pass circuit through main cylinder purge.
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