Front Disc Brakes

Following are two recommended procedures that achieve adequate results using two different off-vehicle disc brake lathes. If any other lathe is used, follow that lathe's instructions and recommendations.

AMMCO(R) BRAKE LATHE
Refer to the manufacturer instructions for all initial setup and cutting procedures.

ACCU TURN(R) BRAKE LATHE
GM Dealer Equipment (one Cut Refinishing Procedure)

Refer to the manufacturer instructions for all initial setup and cutting procedures.

Nondirectional Finishing

It is very important that the rotor surface be made nondirectional by dressing the rotor surfaces with a sanding disc tool such as Ammco(R) 8750 Safe Swirl Disc Rotor Grinder, Accu Turn(R) 433179 Non-Directional Swirl Finisher, or equivalent, using 120 grit aluminum oxide sandpaper. Sand each rotor surface with moderate pressure for a minimum of 60 seconds. If the brake lathe is not equipped with an adequate nondirectional finishing tool, an alternate method is to use a sanding block with 150 grit aluminum oxide sandpaper. With the rotor turning at the equipment manufacturer's highest recommended cutting speed, sand each rotor surface for a minimum of 60 seconds using moderate pressure. After the rotor has been sanded, clean each surface with denatured alcohol or a suitable brake cleaner.

The finished rotor surface should be as close to that of a new rotor as possible. Failure to obtain the best possible rotor finish may affect braking performance.