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 visually to confirm a suspected
leak.
| • | Master Cylinder Fluid Levels. While a slight drop in the levels
occurs with normal lining wear, an abnormally low level, resulting in illumination
of the BRAKE 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 slight leakage.) |
| • | Brake Hose and Pipe Connections. If leakage is found, verify the
torque of the fasteners and/or replace the hose or pipe. |
| • | Connecting Brake Components. Inspect for damage, rebuild or replace
as needed. |
| • | Caliper and Wheel Cylinder Boots. If leakage is found, rebuild
or replace the assembly as specified in Front Disk Brake Caliper or Drum Brake. |
Also, check the service brake pedal travel, the brake adjustment and
the parking brake adjustment.
