Master Cylinders - BENDIX & DELCO-Moraine Dual Piston Master Cylinder: Description

CHANGES, CAUTIONS, CORRECTIONS

PUSH ROD RETAINER NOTE - Replacement master cylinders may have push rod retainer on end of cylinder or at rear of primary piston. Push rod retainer is for manual brakes only. Discard retainer if master cylinder is used on power brakes.

1973 MASTER CYLINDER/POWER UNIT INTERCHANGE NOTE (CHEVROLET MODELS) - Master cylinder and power units are interchangeable between Bendix and Delco-Moraine for all like usages. For example, a Bendix master cylinder for Camaro can be used with a Delco power unit for Camaro; the reverse is also true.

Unit is a single cylinder with front and rear, piston 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 & 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.