• Prevent Spring Brake Drag
  
• May use a Single Air Tank - allows the elimination of the protected reservoir
  
• Small Size is Gentle on Tanks, weigh less than two pounds
  
• Easy Installation & Conversion from Old Systems
  
• Fully Compatible with Anti-Lock Systems
  
• View the Spring Brake Valve presentation

TEV Bulletin and installation information (pdf)

The logic of the TEV valve retains the ability of the driver to repeatedly apply and release the Parking/Emergency brakes, even with a damaged tank.

DESCRIPTION	PART NO.
TEV Valve Assembly	51301
TEV Valve Rebuild Kit	51305

SENSING TRAILER EMERGENCY VALVE (STEV)
Provides Service Brake Priority
To Assure Adequate Supply Is Available from the Tractor.

STEV Bulletin and installation information (pdf)

The logic of the STEV valve assures that the trailer parking brakes will not release before there is sufficient air pressure in the reservoir to apply service brakes.