Brake Fluid: Testing and Inspection

With engine running at idle and the range selector lever in "NEUTRAL," depress the brake pedal and hold with constant foot pressure. If the pedal gradually falls away with constant pressure, the brake hydraulic system may be leaking. Perform visual check to confirm any suspected leak. Check the master cylinder fluid level. While a slight drop in master cylinder reservoir level does result from normal pad wear, an abnormally low level in the reservoir indicates a leak in the system. The brake hydraulic system may be leaking either internally or externally. Also, the system may appear to pass this test but still have a slight leakage. Check for possible brake fluid leaks at the brake pipe and brake hose connections. If any signs of leakage are found, replace the brake pipe or hose. Also, inspect the connecting brake component to determine if it is damaged and should be rebuilt or replaced. Check the brake caliper boots and rear wheel cylinder boots for leaks. If any brake fluid appears to be leaking, rebuild or replace the part in question. When checking the brake fluid levels, the master cylinder rear reservoir may be as low as 25.4 mm (1 inch) from the top if the pads are worn. This is not abnormal.