BENDIX/DELCO-Moraine Dual Piston Master Cylinder: Description

Unit is a single cylinder with front and rear pistons and a separate reservoir and outlet for each piston. Rear piston is operated by pushrod. Front piston is operated by rear piston. In a combination drum and disc system, reservoir that feeds disc brakes is larger, to correspond with large size of the disc brake caliper cylinders. Master cylinder outlet that feeds drum brakes has a residual pressure valve under the tube seat. Disc brake outlet has no valve, because 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.

A stopscrew, which is screwed in from outside of cylinder, limits return stroke of front piston. Some master cylinders have one outlet on bottom and other outlet on side. A bleeder screw on these master cylinders allows trapped air to be released.

NOTE: Dodge models do not have a residual valve for rear drum brakes. Cup expanders must be used on Monaco, Charger, Coronet, Challenger, and manual disc brakes on Dart models rear wheel cylinders.