S-25211 | Genuine Wabco® Air System Clutch Control Swith

1. Monitors Air Pressure Going to the Clutch

• Ensures there is enough air pressure in the system for the clutch to operate correctly.

2. Signals When the Clutch Can Be Safely Engaged

• If air pressure is too low, the switch prevents clutch engagement to avoid damage.

3. Sends Input to the Vehicle’s Electronics

• May signal the ECM, transmission controller, or dashboard indicators.

• Helps coordinate clutch operation in vehicles with automated or semi-automatic transmissions.

4. Provides Safety Protection

• Prevents clutch slipping or failure caused by low air pressure.

• Ensures the clutch only operates under the right pressure conditions.

1. Clutch Won’t Engage or Disengage Properly

• Delayed engagement

• Clutch feels unresponsive

• Clutch may not release when shifting
  This happens because the switch isn’t correctly detecting or controlling air pressure.

2. Low Air Pressure Warning When Pressure Is Normal

• The dash may show a false “low air pressure” or clutch air system warning.

• The switch may send incorrect signals to the system.

3. Trouble Shifting Gears

• Hard shifting

• Grinding gears

• Transmission refusing to go into gear
  This is common in systems where the switch communicates with the transmission controller.

4. Intermittent or Unpredictable Clutch Behavior

• Clutch works sometimes and fails other times.

• Often due to internal switch wear or loose electrical/air connections.

5. Air Leaks Around the Switch

• Hissing sound near the switch area.

• A cracked or failing switch body can allow air to escape, reducing pressure to the clutch.

6. Warning Lights or Error Codes

You may see:

• Clutch system warning

• Transmission fault

• Air system fault
  Depending on the vehicle, diagnostic codes may point to the clutch pressure switch.

7. Clutch Slipping Under Load

• Low or unstable air pressure caused by a faulty switch can cause the clutch to slip.

• This can damage the clutch if not corrected.