Lexus GS, SC 1998-06

Bleeding the Brake System

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If any work is done on the brake system or if air in the brake lines is suspected, bleed the system of air.


NOTE
Do not let brake fluid remain on painted surfaces. Wash it off immediately.

  1. Fill the reservoir with brake fluid.
    NOTE
    If the master cylinder has been disassembled or if the reservoir becomes empty, bleed the air from the master cylinder.

  2.  
  3. Bleed the brake master cylinder as follows:


    1. Disconnect the brake lines from the master cylinder.
    2.  
    3. Slowly depress the brake pedal and hold it.
    4.  
    5. Block off the outer holes with your fingers, and release the brake pedal.
    6.  
    7. Repeat the previous 2 steps 3 or 4 times.

      Click image to see an enlarged view

      Fig. Bleeding the brake line

    8.  

  4.  
  5. Bleed the brake line as follows:


    1. Connect the vinyl tube to the brake caliper.
    2.  
    3. Depress the brake pedal several times, then loosen the bleeder plug with the pedal held down.
    4.  
    5. At the point when fluid stops coming out, tighten the bleeder plug, then release the brake pedal.
    6.  
    7. Repeat the previous 2 steps until all the air in the fluid has been bled out.
    8.  
    9. Repeat the above procedure to bleed the air out of the brake line for each wheel.
    10.  
    11. Tighten the bleeder plug to 8 ft. lbs. (11 Nm).
    12.  

  6.  
  7. Bleed the brake actuator as follows:


    1. Remove the reservoir cap.
    2.  
    3. Install the SST 09992-00242, 09992-00350 to the reservoir.
    4.  
    5. Connect the vinyl tube to the bleeder plug of the brake actuator.
    6.  
    7. Using SST, apply the 14.2 psi (98.1kpa) of pressure to the reservoir.
    8.  
    9. Loosen the bleeder plug.
    10.  
    11. Bleed the air out of the brake actuator, tighten the bleeder plug to 74 inch lbs. (8.3 Nm).
    12.  

  8.  
  9. Check the fluid level and add fluid if necessary.
  10.  

 
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