Question about Chevrolet TrailBlazer EXT

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My 2003 chevy trailblazer has expierenced a soft brake pedal for the past two years. The vehicle will brake when pedal is applied however when stopped you can push the pedal to the floor. I have replaced the power assist portion of the master cylinder in the past year however the same issue applies. Is this common or is there an issue that needs to be addressed. The in no leaks present or indications the of a leak.

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Sounds like you have air in one or more brake lines. All four brake lines needs to be bled to get all air no matter how little air is in them. Recommendations use two people to do this one in vehicle one at the wheel you are bleeding. Loosen bleeder,attach a rubber tube that fits tight around fitting, get a glass jar, (I use a baby food jar) put a little brake fluid in jar so the tube doesn't **** back in air, slowly apply brake and watch air bubbles in jar, do this until no more air bubbles come out. You must do this on all four wheels to be effective. If this doesn't work there is a leak somewhere. Lines, caliper, or wheel cylinder.
Happy Motoring!!!!!!

Posted on Mar 21, 2011

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1. I suspect deteriorated brake fluid, some air in the brake lines and tired flexible brake hoses which are past their useful life.

If the brake fluid has not been changed in the past 12 months then have the brakes bled and new DOT 4 spec brake fluid replaced in the system. (Brake fluid must be bled out and changed at least every 2 years). At the same time look for signs of any minor brake fluid leaks or fluid weeping.

2. In a vehicle of that age I would also be replacing all flexible brake hoses before bleeding the brake system again. These flexible hoses deteriorate badly with age and will swell significantly when you apply pressure to them contributing to a soft pedal feel. This is not expensive to have done and, given the safety importance of the braking system, it is imperative to keep the brakes in decent working condition. Ensure you only use very good quality brake hoses.
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With everything tight, new hoses and new fluid in the system you should have a solid pedal assuming everything else is ok.
(I doubt that the ABS sensors on your vehicle have anything at all to do with the soft pedal you are concerned about but we cannot test this. It is much more likely that the issue is more fundamental as explained above.
On this site we frequently do not have enough information about a vehicle to offer as much information and comment as we would like).

I hope this helps.

Cheers
Sean

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