Mirage Sedan DE L4-1468cc 1.5L SOHC MFI (1997)
Vacuum Brake Booster: Testing and Inspection
OPERATIONAL TEST
For simple checking of the brake booster operation, carry out the following tests:
1. Run the engine for one or two minutes, and then turn the engine "OFF." If the pedal depresses fully the first time but gradually becomes higher
when depressed succeeding times, the booster is operating properly. If the pedal height remains unchanged, the booster is defective.
2. With the engine stopped, step on the brake pedal several times. Then step on the brake pedal and start the engine. If the pedal moves downward
slightly, the booster is in good condition. If there is no change, the booster is defective.
3. With the engine running, step on the brake pedal and then stop the engine. Hold the pedal depressed for 30 seconds. If the pedal height does not
change, the booster is in good condition. If the pedal rises, the booster is defective.
4. Brake booster performance is satisfactory if it passes all three operating tests. If the brake booster does not pass all three tests, there may be a fault
in the check valve, vacuum hose or in the booster itself.
