Question about 2005 Pontiac Sunfire

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I replaced the front rotors and break pads on my daughters sunfire now its acting like the booster is loosing vaccum. i know it is not because i checked for any and all possible leaks. what it actually does is when traveling at road speed the first time you apply the brakes the car stops completely normal. if you let off the brake and reapply it ill go all the way to the floor.and takes an extra effort to stop. when i replaced the pads i followed the normal procedures given by most repair manuals.meaning i did not break any lines loose.i only used a c clamp to push the caliper piston back. im a former mechanic and ive been putting this type pads on for many years. ive never had this paticular problem. any help suggestions or questions would be much appriciated. ps i did after the fact go back and bleed the entire system and the brakes worked fine for a few days then went back to acting the same way. before i replaced the pads and rotors everything was working properly.

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  • dgwtruckn_11 Mar 24, 2011

    how could the system have an air pocket if it was not exposed to air initially? but i will bleed the system again. and that is the procedure i used right rear then left then right front then left no air . its got me stumped.



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The brakes need to be bled again. Start with the furtherest bleeder from the booster and work your way around the car. Bleed with the cap off the fill reservoir and keep the fluid topped off as you bleed. There has to be an air pocket somewhere in the system.

Posted on Mar 23, 2011

  • TJ McDonald Mar 24, 2011

    It kind of has me stumped too, especially since it sounds as if you did the job correctly and you have done it before. Being that the brake system is a completely sealed system, you know that it must have no air in it to work correctly. That is why I am starting with the simple first. Did the fluid level change after it was topped off and test driven after the initial brake job and test drive?



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