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This little jewel is a Residual Pressure Relief Valve. It is used to keep the seals in the rear drum brakes against the bore housing of the wheel cylinders. It does this by keeping a slight pressure in the rear brake lines. If you have Four Wheel Di...

This little jewel is a Residual Pressure Relief Valve. It is used to keep the seals in the rear drum brakes against the bore housing of the wheel cylinders. It does this by keeping a slight pressure in the rear brake lines. If you have Four Wheel Disks like our cars then it is not needed.