Manufacturer communication — 2006 GMC YUKON DENALI XL

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

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  2014 and Prior GM Passenger Cars and Light Duty Trucks

Steps to confirm (in the document’s order)

1. Calibrate the brake lathe and record it monthly, or whenever post-service rotor lateral runout (LRO) measurements consistently read above specification.

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

2. Bench lathe: after refinishing a rotor, loosen the arbor nut and, holding the inside bell clamp so it cannot turn, rotate the rotor 180 degrees.

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   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.

3. Retighten the arbor nut and set the dial indicator on the rotor the same way as when checking runout on the vehicle.

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

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

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

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

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   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.

6. 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.

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   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, never on an on-car lathe.

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

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

Caution

• Cuts of more than 0.508 mm (0.020 in) can bend the tool holder plate.

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  (Cuts of more than 0.508 mm (0.020 in) can also bend this plate).