Brake Caliper: Reassembly

Install bleeder screw and tighten to 80-140 INCH Lbs. Install fitting and bolt using new copper washers. Tighten to 30 ft. lbs. Lubricate new piston seal with brake fluid and install into caliper bore groove. Fit boot on piston with inside lip of boot in piston groove and boot fold toward end of piston that contracts inboard brake shoe. Install new thrust washer and seal on actuator screw. Lube actuator screw with brake fluid and install in piston. Fit balance spring into piston and start piston assembly into caliper housing.
NOTE: Caliper housing and activator screws must be installed on the same side of the car as they were removed from. If parts are on the wrong side parking brake will not work.

Fig 1: Exploded View of Delco-Moraine Single Piston Rear Caliper
Courtesy of GENERAL MOTORS COMPANY
Using suitable tool (J-23072) screw piston all the way back into housing. Ensure that piston is straight or screw may damage seal as is passes through. Before removing tool, install lubricated anti-friction washer and new lever seal. Install lever away from stop, rotate forward and hold while tightening nut.
Remove tool (J-23072), rotate lever back to stop and install return spring (red-right side & black-left side). Using suitable boot installer tool (J-26296 on Buick & Pontiac models and J-28678 on all other models), drive boot in until seal bottoms in housing. Install lining and caliper. See SHOE AND LINING REPLACEMENT .

TIGHTENING SPECIFICATIONS

DISC BRAKE SPECIFICATIONS

Application		Disc Diameter	Lateral Runout	Parallelism	Original Thickness	Minimum Refinish Thickness	Discard Thickness
Buick
	Riviera	10.50"	.003"	.0005"	1.030"	1.020"	.956"
Cadillac
	Eldorado & Seville	10.43"	.004"	.0005"	1.030"	.....	.....
Oldsmobile
	Toronado	10.50"	.005"	.0005"	1.040"	1.020"	.960"
Pontiac
	Firebird	10.50"	.005"	.0005"	1.040"	1.020"	.....