Question about 2003 Pontiac Aztek

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Changed front brake pads now brakes are spongy

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  • Master
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If the brake discs (US=rotors) were anything less than perfect then some sponginess is to be expected, but if the discs were heavily scored or worn they should have been replaced or refaced on a lathe (as long as they have sufficient remaining wear left to allow for this). It takes up to around 250 miles to fully bed in a new set of pads to a worn disc and until then the brakes will not be fully efficient. Hard braking should be avoided and the key to bedding in correctly is to brake earlier than usual and apply them more lightly than normal. This prevent glazing of the high points on the pad which will reduce braking efficiency and also slow or even prevent the pads from fully bedding in.

If the sponginess does not soon start to reduce or is more than a slight effect, then you have a different fault and will need to try bleeding the brake lines. Air should not have got in during a routine pad swap though so if any is present it suggests that the seals in the calipers are faulty and further investigation will then be a matter for urgent attention.

I hope that my reply has been of use to you and that you only have to bed the pads in for the problem to disappear. Please take a moment to rate the free answer I have provided for you and any testimonial which you might wish to add is always welcome!

Posted on Oct 02, 2010

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  • Master
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Hello, Did you have the rotors resurfaced? If not then do so, after doing that sand the pads with rough sandpaper the you will have to drive car and break in the pads. about 6 hard applications from about 45mph to stop.

Posted on Oct 02, 2010

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If you weren't careful about the way you spread the caliper then you could have accidentally introduced air into the hydraulics. Bleed the brakes. Also, make sure you used a high quality pad. El-Cheapo pads from the local parts house often are poor quality.

Posted on Oct 02, 2010

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Posted on Jan 02, 2017

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SOURCE: Front brake pads need to be changed, how?

Jack the vehicle u. Support it on jack stands. Remove front wheels. There are two bolts that hold the brake caliper on. Remove those. use a C-clamp to push the caliper piston back in. Install the new pads in the caliper brackets (pop into place). Put caliper back on, then wheel back on. Put vehicle back on the ground. Press brake until firm. Done.

Posted on May 15, 2009

  • 7353 Answers

SOURCE: changed front brakes, bled the brakes checked

The master cylinder most likely is bad.

Posted on Nov 11, 2009

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