We now have two setups for these cars; one that fits inside most 14" rims, and a new setup that is heavier duty, but requires 15" rims. This HD setup also includes a pair of custom machined hubs (required). Installation is almost identical, so they wil share the same info page... but note that each of these applications require a specific bracket: you cannot use the HD set up with the normal brackets.

1. Crack front lugnuts loose. Block rear wheels. Jack up front end, and support car with sturdy jackstands. Remove lugnuts and wheels. Remove dust cap, cotter pin, nut, washer and bearing. Pull off drum.


2. Get a can of AeroKroil or other penetrant, and give the hydraulic line nuts along with drum backing plate nuts and bolts a good squirt. Break loose hydraulic line nuts, then remove retaining clip. Remove brake shoes, then upper attaching bolt and lower steering arm bolts. Remove drum backing plate as a unit.

3. Clean off spindle. Attach disc bracket, with caliper opening to the rear and the caliper mounting nut welds to the inside. Thread in provided upper bolt, about 1-1/2" long and use a few drops of Lok-Tite Red to keep from vibrating loose. Reattach lower bolts and torque all to 55- foot pounds. we supply to different size bolts. 5/8 and 1/2, as GM has several different variants of this spindle. If we send the wrong upper bolt, please notify us by e-mail and we'll send you out the correct set.


4. Insert rotor bearing spacer with taper facing inward (not required with HD setup). Wash off rotor with lacquer thinner, and repack bearings, install new seal and place on spindle (HD setup - do the same thing to the hubs). Insert outer bearing, washer and nut. Tighten nut with wrench while turning hub. When snug, back off 1 turn, then tighten nut with fingers. Insert cotter pin. This should enable the rotor to rotate freely with play. If so, bend cotter over and install dust cap. (HD - attach rotor, secure temporarily with 3 lugnuts). Wash hands well.


5. Lube slide points, then install caliper (1990 Celebrity, or 1990 Astro AWD for HD), then tighten slide bolts to 35 ft-lbs and wipe down rotor with solvent. Assembly should look as the picture - except for the hose routing: some applications preferred the hose to run down from the caliper, and then up to the hose mount.


8. Attach new hoses (1979 Cadillac Seville) with banjo bolts and new copper crush washers. Torque to spec. Attach hose at frame with clip, then tighten hardline nut. Cycle steering back and forth to verify hose is not interfering with suspension.

9. If you are not replacing the master cylinder, bleed brakes and test for leaks. Remount wheels, lower car and retorque lugnuts. When road testing vehicle, do it slowly- no panic stop in the first 50 miles to give the pads a chance to bed-in.