WIMWM148A | Genuine Williams Controls/Eaton® Air Brake Control Valve

1. Control braking pressure
It adjusts how much air goes to the brake chambers based on how hard the driver presses the brake pedal.

2. Ensure smooth, balanced braking
It distributes air correctly so all wheels apply brakes evenly, preventing skidding or uneven wear.

3. Release brakes properly
The valve vents air out of the system to let the brakes release when the pedal is lifted.

4. Improve braking response
It helps the brakes engage quickly and efficiently, especially on large trucks and buses.

5. Enhance safety
Proper air management ensures the vehicle stops reliably even when fully loaded or traveling downhill.

1. Air leaks

Hissing sounds near the valve often indicate air is escaping, which can reduce braking efficiency.

2. Slow or uneven brake response

Brakes may apply too slowly, too abruptly, or only on some wheels.

3. Brake dragging

Brakes may stay partially applied even when the pedal is released, causing excessive wear and heat.

4. Low or fluctuating air pressure

The system may fail to build or maintain proper air pressure, triggering warnings or ABS lights.

5. Pedal feels spongy or stiff

You may notice inconsistent pedal resistance or difficulty controlling braking force.

6. Warning lights

ABS, brake system, or air pressure warning lights may come on if the valve malfunctions.

7. Vehicle pulls to one side when braking

Uneven airflow to the brakes can cause the vehicle to veer during stops.

8. Inability to fully release brakes

The valve may not vent air properly, keeping brakes partially engaged.