ParkAvenue 1997-1999

Master Cylinder

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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


WARNING
All new master cylinders should be bench bled prior to installation. Bleeding a new master cylinder on the vehicle is not a good idea. With air trapped inside, the master cylinder piston may bottom in the bore and possibly cause internal damage.

  1. Remove the master cylinder from the vehicle, and plug the outlet ports.
  2.  
  3. Secure the master cylinder in a soft jawed bench vise, with the front end slightly down.
  4.  
  5. Remove the master cylinder reservoir cap.
  6.  
  7. Fill the master cylinder reservoir with clean, fresh brake fluid.
  8.  
  9. Use a blunt tipped rod (a long socket extension works well) to slowly depress the master cylinder primary piston about 1 in. (25mm). Make sure the piston travels full its full stroke. As air bleeds from the master cylinder, the primary piston will not travel the full inch.
  10.  
  11. Reposition the master cylinder in the vise with the front end tilted slightly up.
  12.  
  13. Stroke the primary piston about 1 in. (25mm) several times again.
  14.  
  15. Reposition the master cylinder in the vise, so it is level.
  16.  
  17. Loosen the plugs in the outlet ports on at a time. Then push the piston into the bore in order to force the air from the cylinder.
  18.  
  19. Tighten the plugs before allowing the piston to return to its original position. This prevents air from being drawn back into the cylinder.
  20.  
  21. Fill the master cylinder reservoir with clean brake fluid, then install the master cylinder reservoir cap.
  22.  
  23. Install the master cylinder on the vehicle, then follow normal bleeding procedures.
  24.  

 
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