Question about 1999 Oldsmobile Silhouette

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Spongy brakes the brake peddle on my olds is spongy when the engine is running. shut the engine off and it gets hard as a rock. new pads, rotors and bled the system. no change.

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I have had the parts stores give me the wrong pads for these before but also these have a little *** or bump on the back of the pad. this bump has to be in the right position or it can cause the caliper/piston not to seat properly. you may have to disassemble and look carefully for this problem. sometimes the caliper won't sit flat on the pad on the outside because of that little ***. also it can be under the piston. just get rid of the *** if you see it and reassemble. make sure you bleed from all the bleeders not at the closest line that comes free.

Posted on Aug 31, 2008

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Brake pedal is hard when vehicle is not running,but is soft when the 2005GMC Envoy is running.changed the brakes and rotors?

This sounds like a vacuum or hydrolic issue. If The pedal is spongy soft while its running it indicates air in the brake line, or faulty master cylinder, or faulty brake booster. A faulty master cylinder would get hard after a few pumps of the pedal. Since the pedal is hard when it is shut down, it makes me lean toward the brake booster.

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2003 rav 4, just replaced front calipers and pads, after bleeding the line,peddle was spongie, bled all four lines, peddle still spongie, do I need the engine running to properly bleed the lines, and since...

I would bleed the rears too especially if the brake fluid reservoir drained empty. Also you may need to drive the vehicle to seat the brake pads. Check and see how the pedal feels initially before you road test to make sure you don't need to pump the brakes in order to stop. if you do then re bleed all four wheels.If you don't have to pump the pedal and it just feels spongy then try going around the block a few times and see if the pedal stiffens up after the pads have seated.

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Spongy brakes

So long as the brake booster is working, test it by turning on the engine, press the brake pedal all the way down, then shut off engine keeping your foot on the brake pedal, if the pedal comes up slightly pushing against your foot then the booster IS working.

Did you BLEED the brakes??????

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How often do brake rotors need to be replaced? and what is a decent price for rotors, pads? subaru legacy wagon, 2008

They will need replacing when they are at the minimum thickness, which is stamped on the rotor in most cases. If they are rusted, they will need replacement anyhow. you may just call a few repair shops and ask for a quote on pads and rotors. Asking a quote for brakes is hard, because they dont have the car to inspect it, and its hard because nobody quotes the same parts, apples to apples. the cheapest is not the best deal, you get what you pay for. Get good quality brakes, your life depends on it. if it was me I would use dealer parts.

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Need instructions on how to change the front brake pads on a 1994 mazda protege...and i"m a girl so dont assume i know ANYTHING =O)

Ok simple
Place the car in park set the hand brake chock the rear wheels with a brick or a rock so the car does not move.

Now loosen both front tires and lift the car up to a good comfortable working height. Next remove the wheels and set them aside its pretty simple if your just going to replace the brake pads only, You will see something called the caliper it looks like a clamp it will be held on by two screws they can be special screws or simple bolts you remove both of them. now the caliper (clamp) is off there will be a piston that will be pushed very far out you must use brake spreader or very large pliers or a C clamp to push that piston all the way back in. You do this to both sides than once your done with that you will get your new set of brake pads and match them to your old one's make sure there the same and than you install them right where the old one's are with the caliper off. You put it back on over the brake pads clean up the entire area with some brakleen brake parts cleaner. than attatch the caliper with its two bolts and tighten them tight and place the wheels back on the vehicle set it down and remove the jack stands pump up the brakes till there hard BEFORE attempting to drive and that's it your done go for a test drive check over your work 2 times before you set the car down.

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Sounds like air is still in the brake lines, the air sound that you hear is the power assist, but the brake pedal needs to be "high and hard".

if the pedal goes to the floor, that is not good. Sometimes, when pumping brakes for bleeding purposes, the master cylinder gets damaged, as the piston goes past it's normal "travel zone" and gets damged on deposits.....

Now, with that being said, if everything was perfect, brakes are typically not as firm after replacement, due to differences in new pads/shoes and old rotors and drums. Pedal to the floor, however, is never okay.


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Brakes are still spongy after changing the pads, one caliper, and master cylinder. bled front brakes.

I just went to Brake Masters this morning and had them replace the Master Cylinder since I was experiencing the pedal very spongy and going to the floor. When they replaced the Master Cylinder and they gave me back the car, the brakes were still spongy and going to the floor. I addressed this to them and they took another look at it, but when I took it for a second time, the brakes were extremely spongy. It was almost like they gave me back my car in worst condition to when I brought it in. Can you help?

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