Manufacturer communication — 2006 GMC YUKON

• Applies to 2000-2006 GMC Yukon models, with 2000-2006 Cadillac Escalade models, Chevrolet Avalanche, Suburban, Tahoe and 1999-2007 Chevrolet Silverado and GMC Sierra.

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  2000-2006 Cadillac Escalade Models 2000-2006 Chevrolet Avalanche, Suburban, Tahoe 1999-2007 Chevrolet Silverado 2000-2006 GMC Yukon Models 1999-2007 GMC Sierra

• The bulletin was revised to emphasize the continued availability of pre-formed and pre-flared hydraulic brake pipe kits.

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  This bulletin has been revised to emphasize the continued availability of pre-formed and pre-flared hydraulic brake pipe kits.

• Customer Care and Aftersales (CCA) has released pre-formed and pre-flared hydraulic brake pipe kits, usable any time the entire brake pipe assemblies need replacement.

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  Customer Care and Aftersales (CCA) has released pre-formed and pre-flared hydraulic brake pipe kits. These kits can be used anytime replacement of the entire brake pipe assemblies is required.

Repair

1. Pipes with extra shipping bends have tags on either side of each bend; carefully straighten the section between the tags without kinking or damaging the pipe.

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   Those pipes with additional shipping bends will have tags on either side of each shipping bend. Carefully straighten the section of pipe between the tags to remove the shipping bend. Take care not to kink or damage the brake pipes.

2. Remove the brake pipes from the existing routing clips carefully, because all the clips are re-used and the new pipes go back into them.

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   Remove the brake pipes from the existing routing clips carefully to avoid damaging the clips as all the clips will be re-used. The new brake pipes will be reinstalled into the existing clips.

3. Apply ACDelco Rust Penetrant and Inhibitor 10-4020 (GM P/N 88862628) or an equivalent penetrating lubricant to the bleeder screws.

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   Apply ACDelco Rust Penetrant and Inhibitor 10-4020 (GM P/N 88862628) or equivalent penetrating lubricant to the bleeder screws

4. In the utilities procedure, remove the 6 left side body mount bolts and the core support mount bolt.

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   Remove the 6 left side body mount bolts and the core support mount bolt.

5. Carefully raise the left side of the body from inboard of the frame rails approximately 51 mm (2 in).

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   Carefully raise the left side of the body from inboard of the frame rails approximately 51 mm (2 in).

6. The brake pipe fittings are tightened to 18 lb ft (= 24.4 N·m); the text prints the specification as "25 Y (18 lb ft (= 24.4 N·m))".

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   Tighten the brake pipe fittings to 25 Y (18 lb ft).

7. Bleed the hydraulic brake system after installation, referring to Hydraulic Brake System Bleeding in SI.

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   Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding in SI

Parts

• The kits include all the pre-formed and pre-flared brake pipes needed to replace the entire brake pipe assembly, except the rear axle crossover pipe.

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  include all the pre-formed and pre-flared brake pipes needed when replacing the entire brake pipe assembly, except the rear axle crossover pipe.

• The parts table gives the kit number by model years, C/K, model code, option and front suspension; for example, 2003-2006 C model 15706 with option &JC4/JH2-JL4 and torsion bar is 22932593.

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  2003-2006 C 15706 &JC4/JH2-JL4 Torsion Bar 22932593

Caution

• The procedure is not intended for the repair or replacement of a single damaged brake pipe; it is for replacing the entire brake pipe assemblies.

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  This procedure is not intended for the repair or replacement of a single damaged brake pipe. This procedure is for the replacement of the entire brake pipe assemblies with pre-formed and pre-flared components.

• If the pipes are not installed in the correct port locations on all the hydraulic components, the brake system including ABS and/or TCS/VSES StabiliTrak (where equipped) will not operate correctly and hydraulic brake components may be damaged.

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  If the pipes are not installed in the correct port locations on all the hydraulic components, the brake system including the ABS system and/or TCS/VSES Stabiltrak system (where equipped) will not operate correctly and may result in damage to the hydraulic brake components.

• The kit pipes are not an exact duplicate of the installed pipes: they have a nylon coating for better corrosion protection and may have slightly different shapes and bends.

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  The brake pipes in these kits are not an exact duplicate of the pipes currently installed on the vehicle. These pipes have a nylon coating to provide better corrosion protection and may have slightly different shapes and bends and may not exactly match the brake pipes being replaced.