| Subject: | Squeak Noise On Brake Apply |
| Models: | 2008 Buick Enclave |
| 2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2007-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
| 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 Acadia, Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL |
| 2005-2007 GMC Sierra Classic with RPO JF3 or JF7 |
| EXCEPT HYBRID YUKON AND TAHOE MODELS RPO HP2 |
This PI was superceded to add important note not to use on hybrid models. Please Discard PIT3779G.
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·88862806 (in Canada, use P/N·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.
