Master Cylinders - WAGNER Tandem Dual Piston Master Cylinder: Description

NOTE: Some models use other units. See Bendix/Delco-Moraine Tandem Dual Piston Master Cylinder and Chrysler Tandem Dual Piston Master Cylinder in this Section.

Wagner tandem dual piston master cylinder is a single casting with front and rear pistons, and a separate reservoir and outlet for each piston. Rear piston is operated by a push rod connected to brake pedal. Front piston is operated by rear piston. In a combination drum and disc brake system, reservoir which feeds disc brakes is larger, to correspond with larger size of disc brake caliper cylinders. Master cylinder outlet which feeds drum brakes has a residual valve under tube seat. Disc brake outlet has no valve, since disc brakes must not have any residual pressure.

NOTE: Master cylinder used with 4-Wheel drum brakes has residual pressure valves and springs in both brake line outlets.

Failure in either front or rear system does not result in failure of entire system.