Hydraulic System Inspection

With the engine running at idle and the shift lever in "NEUTRAL" (N), 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. Check the following parts visually to confirm a suspected leak:
^ Master Cylinder Fluid Levels. While a slight drop in the level occurs with normal lining wear, an abnormally low level, resulting in illumination of the "BREAK" warning lamp, may mean a leak in the system. The system may be leaking internally or externally; refer to master cylinder for diagnosis of possible master cylinder leaks. (the system may appear to pass this test, but still have a slight leakage.
^ Brake Hose and Pipe Connections. If leakage is found, verify torque of fasteners and/or replace the hose or pipe.
^ Connecting Brake Components. Inspect for damage, and rebuild or replace as needed.
^ Caliper. If leakage is found, rebuild or replace the assembly as specified in Front Disc Brake Caliper or Rear Disc Brake Caliper. Also check the service brake pedal, brake adjustment and parking brake adjustment.