On-Vehicle Inspection

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT BRAKE BOOSTER ASSEMBLY
1. Airtightness check
  1. Start the engine and stop it after 1 or 2 minutes Slowly depress the brake pedal several times.
    
    Fig 1: Depressing Brake Pedal
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT.
    
    If the pedal can be depressed to the floor the first time, but on the 2nd and 3rd time cannot be depressed as far, the booster is airtight.
  2. 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
2. Operation check
1. Depress the brake pedal several times with the engine switch off and check that there is no change in the pedal reserve distance when the pedal is depressed.
2. Start the engine with the brake pedal depressed
HINT

If the pedal goes down slightly, operation is normal.

Fig 2: Depressing Brake Pedal Several Times
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002