BENDIX/DELCO-Moraine Dual Piston Master Cylinder: Overhaul: Reassembly
- Put check valve spring in drum brake outlet.CAUTION: Check valve in disc brake outlet will cause disc brakes to lock up.
Put check valve on top of spring and insert tube seat in outlet against valve. Use a spare tube nut, and screw nut into outlet to bottom tube seat. Remove nut and inspect for burrs or shavings caused by installing seat.
- Install new secondary cups on rear of front (secondary) piston, with cup lips facing away from each other. Some front pistons use a cup in the rear grooves and an "O" ring in the second groove from the rear, with the cup lip facing the rear. Install protector washer, if equipped, over front of secondary piston and install primary cup with lip facing forward and back of cup against protector washer.NOTE: Protector washer may be permanently attached to cup.
- If it is necessary to disassemble rear (primary) piston for replacement of parts see "Primary Piston Assembly" illustration.
- Coat bore of cylinder and all cups with brake fluid, then put spring retainer on end of front spring and put spring on end of front piston so that retainer is seated inside cup. Hold open end of cylinder down and push front spring and piston up into bore until spring seats against end of cylinder.
- Hold cylinder with open end up and insert rear piston assembly, spring end first, into master cylinder. Install lock ring in groove, or screw and retainer, if used. Push rear piston into bore and install stop screw and "O" ring, if used.CAUTION: Stop screw is a special screw. Do not substitute with any other type.
- Install master cylinder cover and gasket with beaded side of gasket facing cylinder casting. On manual brake systems, assemble pushrod through retainer, if used, and push retainer over end of master cylinder. Install new boot over pushrod and press boot down over pushrod retainer.
TIGHTENING SPECIFICATIONS
| Application | Ft. Lbs. | ||
|---|---|---|---|
| American Motors | |||
| Master Cylinder-to-Firewall | 20-35 | ||
| Master Cylinder-to-Power Unit | 20-35 | ||
| Brake Line-to-Master Cylinder | 10-15 | ||
| Chrysler Corp. | |||
| Master Cylinder-to-Firewall | 17 | ||
| Master Cylinder-to-Power Unit | 7-17 | ||
| Brake Line-to-Master Cylinder | |||
| 3/8-7/16" | 7-13 | ||
| 1/2-9/16" | 10-15 | ||
| Ford Motor Co. | |||
| Master Cylinder-to-Firewall | 13-25 | ||
| Master Cylinder-to-Power Unit | 13-25 | ||
| Brake Line-to-Master Cylinder | |||
| 3/8-7/16" | 10-15 | ||
| 1/2-9/16" | 10-17 | ||
| General Motors | |||
| Master Cylinder-to-Firewall | 24 | ||
| Master Cylinder-to-Power Unit | 24 | ||
| Brake Line-to-Master Cylinder | 14 | ||