ParkAvenue 1997-1999

Calipers & Wheel Cylinders

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Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999


CAUTION
Never reuse brake fluid which has been bled from the brake system. Brake fluid should be changed every few years. It wears out due to moisture being absorbed, which lowers the boiling point.

Old brake fluid is often the cause of spongy brakes returning a week or so after bleeding the system. If all parts check good. Change the fluid by repeated bleeding.

  1. Deplete the booster reserve by applying the brakes a few times with the engine OFF until all reserve is depleted.
  2.  
  3. Fill the master cylinder reservoir to the full level mark with brake fluid from a fresh, sealed container. You must maintain the fluid level during the bleeding procedure.
  4.  


WARNING
Clean, high quality brake fluid is essential to the safe and proper operation of the brake system. You should always buy the highest quality brake fluid that is available. If the brake fluid becomes contaminated, drain and flush the system, then refill the master cylinder with new fluid. Never reuse any brake fluid. Any brake fluid that is removed from the system should be discarded. Also, do not allow any brake fluid to come in contact with a painted surface; it will damage the paint.

  1. If the master cylinder is known or suspected to have air in the bore, bleed it as follows before bleeding any of the wheel cylinders or calipers:
    1. Loosen the forward brake line connection and the master cylinder.
    2.  
    3. Fill the master cylinder until fluid begins to flow from the front pipe connector port, maintaining the fluid level.
    4.  
    5. Tighten the front brake pipe on the master cylinder securely.
    6.  

  2.  


WARNING
Make sure the master cylinder reservoir cap is installed before the brake pedal is pressed. This prevents brake fluid from spraying out of the reservoir.

    1. Have an assistant depress the brake pedal slowly one time, and hold. Loosen the forward brake pipe connection again to purge air from the bore. Tighten the connection and then slowly released the brake pedal. Wait 15 seconds. Repeat the sequence, including the 15 second wait, until all air is removed from the bore.
    2.  
    3. Tighten the brake pipe connection to 11 ft. lbs. (15 Nm).
    4.  


  1. After all the air has been removed from the front connection, repeat the same procedure at the rear connection of the master cylinder.
  2.  
  3. Individual wheel cylinders and calipers are bled only after all the air has been removed from the master cylinder.
  4.  


WARNING
Make sure the master cylinder reservoir cap is installed before the brake pedal is pressed. This prevents brake fluid from spraying out of the reservoir.

  1. If all of the wheel circuits must be bled, use one of the following two sequences, depending upon the year of your vehicle:
    1. 1986-90 vehicles: right rear, left front, left rear, then right front.
    2.  
    3. 1991-99 vehicles: right rear, left rear, right front, then left front.
    4.  

  2.  
  3. Fill the master cylinder reservoir with brake fluid. Keep the level at least 1 / 2 full during the bleeding operation.
  4.  
  5. Raise and support the vehicle safely.
  6.  
  7. Remove the bleeder valve cap, and place a proper size box end wrench, or suitable bleeder wrench, over the bleeder valve.
  8.  



Click image to see an enlarged view

Fig. To bleed the rear brakes, remove the cap from the wheel cylinder bleeder screw (see arrow)



Click image to see an enlarged view

Fig. Attach a hose to the bleeder valve with the other end submerged in a container of clean brake fluid



Click image to see an enlarged view

Fig. If necessary, you can remove the bleeder valve from the wheel cylinder by unscrewing it

  1. Attach a transparent tube to the bleeder valve, and submerge the other end of the tube in a clear container, partially filled with clean brake fluid.
  2.  



Click image to see an enlarged view

Fig. There are special bleeder wrenches available, that make bleeding the brakes easier

  1. Have an assistant slowly depress the brake pedal one time, and hold.
  2.  
  3. Loosen the bleeder valve to purge the air from the cylinder.
  4.  



Click image to see an enlarged view

Fig. To bleed the front brakes, remove the protective cap covering the bleeder valve/screw



Click image to see an enlarged view

Fig. Attach the brake bleeder line, with the other end submerged in a container full of clean brake fluid, then open the valve

  1. Tighten the bleeder screw, then slowly release the brake pedal. Wait 15 seconds.
  2.  
  3. Repeat this sequence until all the air is removed. Depending upon the amount of air in the system, you may have to repeat the sequence at least 10 times to remove all of the air from the system.
  4.  
  5. Lower the vehicle and refill the master cylinder.
  6.  
  7. Check the brake pedal for sponginess. If the pedal is spongy, repeat the entire bleeding procedure.
  8.  
  9. For 1994-99 vehicles, use a Tech 1® or equivalent scan tool to pressure bleed the brake system, using the "Auto Bleed" sequence. Then, repeat the wheel cylinder and caliper bleeding sequence.
  10.  

 
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