Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2014 and prior GM passenger cars and light duty trucks.

  the passage

  2014 and Prior GM Passenger Cars and Light Duty Trucks

Steps to confirm (in the document’s order)

1. Bench lathe: after refinishing a rotor, loosen the arbor nut and, holding the inside bell clamp so it does not rotate, rotate the rotor 180 degrees.

   the passage

   After refinishing a rotor, loosen the arbor nut and while holding the inside bell clamp to keep it from rotating, rotate the rotor 180 degrees.

2. Retighten the arbor nut, set the dial indicator on the rotor as when checking runout on the vehicle, then rotate the arbor and read the runout.

   the passage

   Retighten the arbor nut and set the dial indicator on the rotor using the same instructions as checking the run out on the vehicle. 3. Rotate the arbor and read the runout.

3. Divide the reading by two; that is the amount of runout the lathe is cutting into the rotor.

   the passage

   Divide the reading by two and this will give you the amount of runout the lathe is cutting into the rotor.

4. On-car lathe: attach a vise-grip dial indicator to a fixed point in the wheel well and bring the indicator to a flat surface on the cutting head.

   the passage

   Attach a vise-grip dial indicator to a fixed point in the wheel well and bring the dial indicator to a flat surface on the cutting head.

5. After compensation, if runout exceeds 0.1016 mm (0.004 in), or 0.050 mm (0.002 in) as measured within the rotor diameter, the lathe calibration must be checked.

   the passage

   If runout is in excess of 0.1016 mm (0.004 in) (0.050 mm (0.002 in) as measured within the rotor diameter), calibration must be checked.

Repair

1. If there is any runout, machine the inside bell clamp in place on the lathe; this is for a bench type lathe only and must not be done on an on-car lathe.

   the passage

   If there is any runout, you will need to machine the inside bell clamp in place on the lathe (this procedure is for a Bench type lathe ONLY, DO NOT machine inside the bell clamp on an On-Car type lathe).

2. Remove any nicks or burrs on the shoulder of the arbor; an 80-grit stone can be used.

   the passage

   Any nicks or burrs on the shoulder of the arbor must be removed. An 80-grit stone can be used to accomplish this.

Caution

• Calibrate the brake lathe and record it monthly, or whenever lateral runout (LRO) measured on rotors after service is consistently above specification.

  the passage

  Calibration of the brake lathe should be performed and recorded monthly or whenever post-service brake rotor LRO measurements are consistently reading above specification.

• Cuts of 0.1016-0.381 mm (0.004-0.015 in) give the best surface finish and the optimal tip life.

  the passage

  Cuts of 0.1016-0.381 mm (0.004-0.015 in) will provide the best surface finish and the optimal tip life.

• The tool holder plate can bend or break if the cutting arms run into the hub of the turning rotor; cuts of more than 0.508 mm (0.020 in) can also bend it.

  the passage

  It can bend or break if a technician accidently runs the cutting arms into the hub of the rotor while the rotor is turning. (Cuts of more than 0.508 mm (0.020 in) can also bend this plate).