The master cylinder is usually located under the hood and near the fire wall on the driver's side. Take out the cover and check the gasket, or Hydraulic hose fittings. Inspect the cover for damage or plugged vent holes. Clean the vent holes, if necessary.
Check the brake fluid level the actual planet master cylinder. A cast-iron reservoir is frequently filled to within 1/4 inch on the top. A plastic reservoir may have fluid level mars. Do not overfill a reservoir. If fluid must be added, a leak probably has developed or the shoes and/or pads are worn. Check the system carefully to locate the leak. To test for contaminated fluid, place a touch of brake fluid in a clear glass jar. If for example the fluid is dirty or separates into layers, it is contaminated. Contaminated fluid must be replaced instead. Contaminated brake fluid can damage rubber parts and cause leaks. When replacing contaminated brake fluid, it crucial to flush and refill the brake system with new fluid. Always use fluid with a DOT rating of three or higher. Follow manufacturer's recommendations. Check the master cylinder for dampness and leaks around the body fittings, especially in the rear. A leak where it is mounted to the fire wall or power brake unit indicates a defective rear piston seal. The actual cylinder must be rebuilt or replaced.
Check all tubing, hoses, and connections from under the hood to the wheels for leaks and damage. Wheels and tires should likewise be inspected for signs of brake fluid leaks. Check all hoses for flexibility, bulges, and cracks. Check parking brake linkage, cable and connections for damage and display. Replace parts where necessary. Depress and release the brake pedal many. Check for friction and noise. Pedal movement should be smooth, with no squeaks from the pedal or brakes. The pedal should return quickly when ought to released. When operating the engine, guarantee the transmission lever is in neutral or park. Guaranteed the area is properly ventilated for the exhaust to move out.
Apply heavy foot pressure to the brake pedal. Verify a spongy pedal and pedal schedule. Spongy pedal action is springy. Pedal action should feel trim. Pedal reserve is the gap between the brake pedal and the ground after the pedal has been depressed fully. The pedal should not get smaller than 1 or 2 inches over the floor. With you can off, hold light foot pressure about the pedal for about 15 seconds. There should be no pedal movement during this time around. Pedal movement indicated a leak. Repeat an hour or so using heavy pedal pressure. If work involved . pedal movement, but the fluid level is not low, the master cylinder has internal leakage. It must be rebuilt or swapped out. If the fluid level is low, there a good external leak somewhere in the brake system. The leak must be refurbished.
To check power brake operation, depress and release the pedal several times while the engine is stopped. This eliminates vacuum from the Hydraulic hose lighting fixtures. Hold the brake down with moderate foot pressure and start the engine. IF the power unit is operating properly, the brake pedal moves downward once the engine is going.