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
- Remove the master cylinder from the vehicle, and plug the outlet ports.
- Secure the master cylinder in a soft jawed bench vise, with the front end slightly down.
- Remove the master cylinder reservoir cap.
- Fill the master cylinder reservoir with clean, fresh brake fluid.
- 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.
- Reposition the master cylinder in the vise with the front end tilted slightly up.
- Stroke the primary piston about 1 in. (25mm) several times again.
- Reposition the master cylinder in the vise, so it is level.
- 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.
- Tighten the plugs before allowing the piston to return to its original position. This prevents air from being drawn back into the cylinder.
- Fill the master cylinder reservoir with clean brake fluid, then install the master cylinder reservoir cap.
- Install the master cylinder on the vehicle, then follow normal bleeding procedures.