How To Check a PCV Valve Remove the PCV valve to check it Remove the PCV valve from its grommet. With the engine off, shake the valve. If it’s good, you’ll hear a solid clicking sound.

This built in check valve located in the front will help tell the difference between the two most common proportioning valves. This one is for drum brakes in the rear. 4.

This is Wilwood PN 260-11179, an adjustable aftermarket proportioning valve. It's used to adjustably lower the amount of hydraulic pressure that gets sent to the rear brakes.