Which valve is better for an air-ride suspension, service brake priority or spring brake priority?
Either is fine, but Hendrickson prefers (not recommends) a service brake priority valve over a spring brake priority valve. The service brake priority valve ensures that there is pressure in the onboard air tank before the trailer is able to move. This helps to reduce the length of time a loaded trailer can be operated without sufficient pressure in the air springs. The service brake priority valve also helps to reduce the possibility of SURELOK’s mechanical support arms being held in place, after the trailer parking brakes are released, due to friction between the SURELOK arms and the rear suspension beams.
