Hi I’m having a problem with a valve selenoid wabco S42 170, In a 2013 Cascadia, every time I press the service brake this valve start leaking air, I replaced the valve for a new one and nothing change. Any Idea ?
Not sure which valve your talking about by the part number, but if it's the priority valve mounted under your steer axle and you have Roll stability and traction control, then you need to clean the vents on the little solenoid valve near mounted near them. The event is a little black plastic button on the bottom (away from the air lines) if will snap off there and a little air and water will clean it up.