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Problem
Brakes chatter
Hissing noise when
brake pedal is held with
engine stopped
Brake pressure warning
light will not go out or
stays on excessively long
after start-up
Cause
Air in brake system
Worn brake surface material
Wrong oil in differential
Leakage in brake valve, or brake
piston
Malfunction in brake low
pressure warning switch
Brake accumulator pressure too
low
Low brake pump standby
pressure setting.
Leakage in pressure reducing
manifold block
Leakage in brake system
Worn brake pump
Leakage in parking brake
solenoid
Do brake bleed procedure.
Inspect brake surface material.
Drain. Refill.
Do brake system leakage test.
Replace switch.
Recharge accumulator.
Do brake pump standby pressure test.
Do pressure reducing valve manifold leakage test.
Do brake system components leakage tests.
Do brake pump flow test.
Do parking brake pressure test.
4-38
Remedy
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