Only clean, new Heavy Duty brake fluid meeting DOT 3 or 4 specifications should be used in the brake hydraulic system.
The brake master cylinder is located under the hood on the driver's side of the car.
Before removing the master cylinder reservoir cap, make sure the car is resting on level ground and clean all dirt away from the top of the master cylinder. Pry off the retaining clip. The brake fluid level should be within 1 / 4 inch of the top of the reservoir in both sides.
If the level of the brake fluid is less than half the volume of the reservoir, check the brake hydraulic system for leaks. Leaks most commonly occur at the wheel cylinders (rear).
There is a rubber diaphragm in the top of the master cylinder cap. As the fluid level drops due to normal brake shoe wear or leakage, the diaphragm takes up the space. This prevents the loss of brake fluid out of the vent cap and contamination by dirt. After filling the master cylinder to the proper level with brake fluid, fold the rubber diaphragm up into the cap, replace the cap on the reservoir and snap the retaining clip into place. Use only Heavy Duty brake fluid meeting DOT 3 or 4 specifications.