Vacuum Brake Booster Check Valve: Testing and Inspection

CHECK VALVE OPERATION CHECK
1. Remove the check valve.

CAUTION
Replace the check valve when it is faulty.





2. Using a vacuum pump, check operation of the check valve.





BLEEDING

CAUTION
Be sure to use the specified brand and type of brake fluid.
Avoid mixing with other type of brake fluid.
Brake fluid: DOT3 or DOT4

BLEEDING OF BRAKE PIPELINE





Perform the bleeding in the order shown in the figure.

DISK BRAKE BLEEDING

CAUTION
Take care not to contact the parts or tools to the caliper because the paint of caliper will be scratched. And if there is brake fluid on the caliper, wipe it off quickly.





Connect a vinyl tube to the outer end of the air bleeder screws to bleed the circuit of air. Then, connect the vinyl tube to the inner end and bleed the circuit of air. Except for these, the conventional procedures shall be followed. After the circuit has been bled of air, tighten both air bleeder screws securely.