Check for a restricted line or hose.

Replace or repair the line.

Check for a faulty air brake valve.

Refer to Air Brake Application Valve Operational Check .

Check if the brakes are out of adjustment.

Refer to Air Drum Brake Adjustment in Air Drums.

Check for air line leaks.

Refer to Low Air Pressure Switch Operational Check .

Check if the governor cut-out adjustment is too low.

Refer to Air Compressor Governor Valve Adjustment in Air Compressor.

Check for worn linings or drums.

Refer to Air Drum Brake System Inspection in Air Drums.

Check for brake pedal linkage binding.

Refer to Air Brake Pedal Replacement .

Check for brake shoe binding.

Refer to Brake Shoe Inspection in Air Drums.

Check for camshaft bushing binding.

Refer to Air Drum Brake Adjustment in Air Drums.

Check for a safety valve malfunction.

Refer to Air Brake Dryer Safety Valve Exhausting Air .