Power Brake Unit Push Rod Clearance
WARNING: This page is about a different car, the 1991 Plymouth Laser and 1991 Eagle Talon. However, it is still accessible from the selected car via links, so may be relevant.
- Clearance between power brake unit push rod and master cylinder piston (dimension "A") prevents brake drag. See Fig 1 . To measure this clearance, place straight edge across master cylinder end face. Measure distance between surface of straight edge and master cylinder piston. Record dimension measured.
- Subtract thickness of straight edge from dimension obtained in step 1). This is dimension "B". Measure distance between master cylinder-to-power brake unit mating surface (on master cylinder) and master cylinder end face. This is dimension "C".
- Place straight edge across master cylinder-to-power brake unit mating surface (on power brake unit). Measure distance between straight edge and end of push rod. Record this dimension.
- Subtract thickness of straight edge from dimension recorded in step 3). This is dimension "D".
- Subtract dimension "C" from dimension "B". Record the difference; subtract dimension "D" from this difference. This is dimension "A".
- On vehicles with 7" or 8" (178 mm or 203 mm) power brake unit, if dimension "A" is not .020-.028" (0.5-0.7 mm), turn adjustable end of push rod until dimension "A" is within specification.
- On vehicles with 9" (229 mm) power brake unit, if dimension "A" is not .031-.039" (0.8-1.0 mm), turn adjustable end of push rod until dimension "A" is within specification.