FAQ for Brake Disc Repair
Q: What is the recommended torque for the brake caliper bracket mounting bolts (25 Series).?
A:
The recommended torque is 300 Nm (221 lb-ft).
By BobGM Specialist
01/11/2022 Q: What should we do to obtain the desired non-directional finish after refinishing the brake rotor?
A:
You should follow the brake lathe manufacturer's recommended speed setting for applying a non-directional finish, apply the non-directional finish, and clean each friction surface of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
By BobGM Specialist
01/11/2022 Q: What should we do when before installing the 2 brake caliper bracket mounting bolts?
A:
You should remove all traces of the original adhesive patch, clean the threads of the bolts with brake parts cleaner or the equivalent and allow them to dry, and apply Threadlocker GM P/N 12345493 (Canadian P/N 10953488) to the threads of the bolts.
By BobGM Specialist
01/11/2022 Q: What is the removal procedure for the disc brake backing plate in the rear (15 Series W/NYS)?
A:
You need to release the parking brake, raise and support the vehicle, remove the tire and wheel assembly, relieve the tension from the park brake cable, remove the rear park brake bracket bolt, the park brake cable, the park brake shoe, the park brake actuator lever housing, and the backing plate.
By BobGM Specialist
01/11/2022 Q: What should be noticed when the brake rotor has been separated from the hub/axle flange?
A:
You should clean any rust or contaminants from the hub/axle flange and the brake rotor mating surfaces.
By BobGM Specialist
01/11/2022 Q: What should we do if the rotor is difficult to remove due to corrosion in the hub area?
A:
You should clean all the surface areas and the threaded holes of contamination, generously apply penetrating oil or the equivalent to the hub/rotor area, insert M10 x 1.5 bolts into the threaded holes of the rotor, and tighten both bolts evenly to force the rotor from the hub.
By BobGM Specialist
01/11/2022 Q: What should we do before installing the brake caliper bracket mounting bolts.?
A:
You should remove all traces of the original adhesive patch, clean the threads of the bolt with brake parts cleaner or the equivalent and allow them to dry, and apply Threadlocker GM P/N 12345493 (Canadian P/N 10953488) to the threads of the bolt.
By BobGM Specialist
01/11/2022 Q: What is the recommended torque for the brake caliper bracket mounting bolts?
A:
The recommended torque is 200 Nm (148 ft. lbs.).
By BobGM Specialist
01/11/2022 Q: How do on-car lathes react to Axle Float? Does the play affect the machining of the rotor, either surface finish or LRO?
A:
Because the Pro-Cut on-car lathe adjusts in a live mode while spinning the hub/rotor, the dynamics of a floating axle are effectively eliminated. Once the lathe is compensated, there is no difference in the cutting/surface finish and LRO are just the same as with a non-floating axle.
By BobGM Specialist
01/11/2022 Q: What is the expected tip life for an on-car lathe?
A:
The geometry and composition of the Pro-Cut tips are designed for °single pass° cutting. When using the Pro-Cut the cutting depth should be set to take all material needed to get below rust grooves, eliminate all run-out and resurface the entire disc in a single pass. Cuts of 0.1016-0.381 mm (0.004-0.015 in) will provide the best surface finish and the optimal tip life. No °skim cut° or °finish cut° is needed. Failure to follow this procedure will shorten tip life. The Pro-cut tips will last between 7-12 cuts per corner. With three usable corners, a pair of tips is good for at least 21 cuts.
By BobGM Specialist
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