Operation CHARM: Car repair manuals for everyone.

Brake Fluid Leaks

With the engine running at idle and the shift lever in neutral, depress the brake pedal and hold a constant foot pressure on the pedal. If the pedal gradually falls away with the constant pressure, the hydraulic system may be leaking. Perform a visual check to confirm any suspected leak.

Check the master cylinder fluid levels. While a slight drop in reservoir level does result from normal lining wear, an abnormally low level in either reservoir indicates an external leak in the system. The hydraulic system may be leaking either internally or externally.