2005 Chevy Silverado

Is this happening when the truck is moving or stationary?

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Service Information
2005 Chevrolet Chevy C Silverado - 2WD | Sierra, Silverado (VIN C/K) Service Manual | Preliminary Information | Document ID: 2153762

#PIT3779J: Squeak Noise On Brake Apply - keywords booster cylinder disc drum fluid front master rub - (Jun 16, 2008)

Subject: Squeak Noise On Brake Apply

Models: 2004-2007 Buick Rainier

2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT

2007-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2008 Chevrolet Malibu

2004-2006 Chevrolet SSR

2004-2008 Chevrolet Trailblazer, Trailblazer EXT and Trailblazer SS

2005-2007 Chevrolet Silverado Classic with RPO JF3 or JF7

2004-2008 GMC Envoy, Envoy XL and Envoy XUV

2007-2008 GMC Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL

2005-2007 GMC Sierra Classic with RPO JF3 or JF7

2008 Pontiac G6

2008 Saturn Aura

EXCEPT HYBRID YUKON AND TAHOE MODELS RPO HP2

This PI was superseded to update models. Please discard PIT3779H.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Important: DO NOT USE THIS PI FOR THE HYBRID YUKON AND TAHOE MODELS.

Some customers may comment on a squeak noise when the brake pedal is applied or when released. This noise is normally heard when the brake pedal is slowly applied with the engine on or off, but can occur when the brake pedal is released. The noise may be isolated to the master cylinder area.

Recommendation/Instructions:
To correct this concern, remove as much of the old brake fluid from the master cylinder as possible and refill with a modified DOT 3 brake fluid, P/N Â 88862806 (in Canada, use P/N Â 88862807). Depress and release the brake pedal five times to allow the new fluid to enter the system.

Note: It is not necessary to flush the complete brake system with the modified dot 3 fluid to correct this noise.

Part Information
Part Number
Description
Qty

88862806
Brake Fluid, DOT 3
1

(In Canada 88862807)

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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It could also be a worn brake pedal assembly or a sticky brake switch.