GM Service Manual Online
For 1990-2009 cars only

Soft Brake Pedal - keywords low

Subject:Soft Brake Pedal

Models:2008 Buick Lucerne
2008 Cadillac DTS



This PI was superseded to update models. Please discard PIC4840.


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

Condition/Concern:

A customer may comment the brake pedal seems soft. The cause may be fluid bypassing the piston seal in the master cylinder.

Recommendation/Instructions:

Replace the brake master cylinder.

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.