ParkAvenue 1997-1999

Fluid Level Check

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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

It should be obvious how important the brake system is to safe operation of your vehicle. The brake fluid is key to the proper operation of your vehicle. Low levels of fluid indicate a need for service (there may be a leak in the system or the brake pads may just be worn and in need of replacement). In any case, the brake fluid level should be inspected at least during every oil change, but more often is desirable. Every time you open the hood is a good time to glance at the master cylinder reservoir.

  1. Make sure the vehicle is parked on a level surface, then raise the hood.
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Fig. Some vehicles may have a warning label on the master cylinder reservoir

  1. Wipe off the master cylinder cover before you remove it, to prevent contaminating the fluid with dirt.
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Fig. Use a paper towel to wipe all of the dirt from around the master cylinder cap

On some models, a see-through reservoir is used, eliminating the need of removing the cylinder cover.

  1. On early model vehicles, the cover is snapped into place on the master cylinder. To remove the cover, just press up on the two tabs on the side of the cover, tilt it, then remove it. Be careful not to damage the rubber seal under the cover.
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Fig. On early model vehicles, the master cylinder lid is a snap-on type, and the fluid level markings are on the side of the reservoir

  1. On later model vehicles, the master cylinder cap is a screw-on type. Simply unscrew the cap (and diaphragm, if equipped), and remove it from the reservoir.
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Fig. On newer vehicles, the master cylinder cap screws onto the reservoir



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Fig. After cleaning the area, unscrew the master cylinder reservoir cap


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.

Don't leave the cover off of the master cylinder or the cap off of the brake fluid container any longer than necessary.

  1. The fluid level in each master cylinder reservoir should be 1 / 4 in. (6mm) below the lowest edge of the filler opening or reach the marking shown in the reservoir. Use fresh brake fluid to adjust the level if necessary.
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Fig. Add just enough brake fluid to bring the level up to the mark on the reservoir



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Fig. When adding brake fluid, only use fluid from a fresh sealed container

It is normal for the master cylinder fluid level to drop as the brake linings wear - 1 / 8 in. (3mm) drop about every 10,000 miles (16,100km). If the fluid level is constantly low, the system should be checked for leaks.

  1. Carefully seat the cover seal into the cover, then snap or screw the cover into place on the master cylinder. If equipped, with a snap-on lid, make sure that all four snaps latch completely.
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