POSSIBLE CAUSES SUGGESTED CORRECTIVE ACTION
TROUBLE: The Low Pressure Warning Circuit Not Operating Properly
The Low Brake Pressure lamp is burned out.
The electrical circuit is open.
Pressure switch defective.
Replace the bulb.
Check switch circuit wiring.
Replace the pressure switch.
TROUBLE: Low Pressure Warning is On Even Though System Pressure is Proper
Short in electrical system.
Pressure switch is defective.
Check wiring.
Replace the switch.
TROUBLE: Low Pressure Warning Comes On and Pressure is Low
Steering circuit is malfunctioning.
The pump is worn.
Check steering circuit pressures.
Rebuild or replace pump.
TROUBLE: A Brake Accumulator Bleeds Off Quickly When Supply Pressure is Cut Off
Accumulator bleeddown valve is open.
Accumulator precharge is low.
Leak in one circuit.
Malfunction in brake valve.
Close valve, check precharge.
Recharge accumulator
Check plumbing.
Remove, disassemble, clean, reassemble; or replace.
TROUBLE: A “Squeal” is Heard When Controller is Operated
Rapid operation of controller.
Brake Valve assembly is damaged.
Hydraulic oil is too hot.
Normal
Replace the brake valve assembly.
Check entire hydraulic system for restriction etc.
TROUBLE: The Output Pressure At Controller is Correct but Brakes are Not Applying
Brake lines are blocked or improperly connected. Check plumbing.
TROUBLE: The Brake Pressures Drift Excessively While Pedal is Held Steady
Contamination in brake valve assembly.
Damage in brake valve assembly.
Dual relay valve malfunctioning
Remove, disassemble, clean, reassemble; or replace.
Repair or replace brake valve assembly.
Repair or replace dual relay valve assembly.
J04025 Brake Circuit Checkout J4-11
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