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 for ice in the air system.

Refer to Air Dryer/Moisture Ejector System 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 Air Brake System Leak Test .

Check for service chamber diaphragm leaks.

Refer to Air Brake System Leak Test .

Check for worn linings or drums.

Refer to Air Drum Brake System Inspection in Air Drums.

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.