Toyota Highlander Service Manual: On-vehicle inspection
1. INSPECT BRAKE BOOSTER
(a) Airtightness check.
- Start the engine and stop it after 1 or 2 minutes. Depress
the brake pedal several times slowly.
HINT: If the pedal can be depressed (to the floor) the first time, but cannot be depressed as far on the 2nd or 3rd time, the booster is airtight.
- Depress the brake pedal while the engine is running,
and stop the engine with the pedal depressed.
HINT: If there is no change in the pedal reserve distance while holding the pedal for 30 seconds, the booster is airtight.
(b) Operating check.
- Depress the brake pedal several times with the ignition switch off and check that there is no change in the pedal reserve distance.
- Start the engine with the brake pedal depressed.
HINT: If the pedal goes down slightly, operation is normal.
2. INSPECT VACUUM CHECK VALVE
(a) Check vacuum check valve.
- Slide the clip and disconnect the vacuum hose.
- Remove the vacuum check valve.
- Check that there is ventilation from the booster to engine, and no ventilation from the engine to the booster.
- If any fault is found, replace the vacuum check valve.
COMPONENTS
Replacement
1. REMOVE FRONT SUSPENSION BRACE SUB-ASSY UPPER CENTER (SEE PAGE 32-14 )
2. REMOVE AIR CLEANER ASSY (2AZ-FE ENGINE TYPE) (SEE PAGE 14-24 )
3. REMOVE AIR CLEANER CAP SUB-ASSY (3MZ-FE ENGINE TYPE) (SE ...
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