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Home >> Lexus >> 2006 >> GS 300 RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes - Mechanical >> BRAKE MASTER CYLINDER (w/ VSC) >> Inspection

BRAKE MASTER CYLINDER (w/ VSC): Inspection

  1. INSPECT AND ADJUST BRAKE BOOSTER PUSH ROD 
    NOTE: Make an adjustment with no vacuum in the brake booster assembly. (Depress the brake pedal several times with the engine stopped.)

    HINT:

    Adjustment of the brake booster push rod is required when the brake master cylinder sub-assembly is replaced with a new one. Adjustment is not necessary when the removed brake master cylinder sub-assembly is reused and the brake booster assembly is replaced with a new one.

    1. Apply chalk to the tip of the accessory tool.

      HINT:

      An accessory tool is enclosed with a new brake master cylinder sub-assembly.

    2. Place the accessory tool on the brake booster assembly.
    3. Measure the clearance between the brake booster push rod and accessory tool.

      Standard clearance: 

      0 mm (0 in.) 

      HINT:

      Adjust the clearance in the following cases:

      • If there is a clearance between the accessory tool and the shell of the brake booster (floating accessory tool), the push rod is protruding too far.
      • If the chalk does not stick on the tip of the brake booster push rod, the push rod protrusion is insufficient.
        Fig 1: Measuring Clearance Between Brake Booster Push Rod And Accessory Tool
        G04025323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. If the clearance is not as specified, adjust the push rod length by holding the rod using SST and turning the tip of the rod using a socket driver (7 mm).

      SST 09737-00020 

      HINT:

      Check the push rod clearance again after adjustment.

      Fig 2: Adjusting Push Rod Length
      G04025324Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002