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Old 06-01-2009, 09:20 AM   #1
dmn66kn
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Default New brakes wheel shake and loss in brake power

I replaced my brake pads and rotors about 2 weeks ago because my brakes were starting to squeak and there was alot of shake when I would stop. Now with the new brakes on it still shakes. Also, sometimes it will seem like it is having trouble stopping. I got off the freeway yesterday and it took like 3 times the distance to slow down. The brakes smell like they are burning too.

When I pulled the the old pads off the inside pad on both wheels had about 25% more wear then the outside pads. I replaced the metal brackets and caliper pins on both sides. Also, i lubricated the caliper pins with a brake grease. I made sure to knock loose any rust on the wheel hubs so the rotors would sit properly. When I was done I sprayed the rotors with brake cleaner.

Any ideas what could be going on with this?

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Old 06-01-2009, 10:00 AM   #2
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Default Re: New brakes wheel shake and loss in brake power

Have you checked your brake fluid? Are we talking all brakes or specifically front or rear?

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Old 06-01-2009, 10:09 AM   #3
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Default Re: New brakes wheel shake and loss in brake power

Brakes fluid is at about the normal level. I only did the front brakes.

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Old 06-01-2009, 10:21 AM   #4
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Default Re: New brakes wheel shake and loss in brake power

How is the rear? Is it rear drum or disc?

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Old 06-01-2009, 10:26 AM   #5
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Default Re: New brakes wheel shake and loss in brake power

the rear are drum

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Old 06-01-2009, 10:32 AM   #6
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Default Re: New brakes wheel shake and loss in brake power

Does the pedal stick? I'm thinking it's the pins. Make sure the boots are not torn and allow grease to come out. Either that or the calipers are sticking. It would be very inconvienent for both to go bad at the very same time. You sqeezed the front pistons in when doing the brakes right?

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Old 06-01-2009, 10:58 AM   #7
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Default Re: New brakes wheel shake and loss in brake power

The pedal doesn't seem to stick at all. The boots weren't ripped, I checked them when I put the new pins on. Also, I put a decent amount of grease on all the pins. Yes, I squeezed the piston in when I put the new pads on. I pushed them in so they were even with the caliper.

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Old 06-01-2009, 11:57 AM   #8
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Default Re: New brakes wheel shake and loss in brake power

When you changed the brakes what did you hang the caliper on? Did you let it dangle? Make sure there are no kinks in the brake lines. If nothing there I might try another set of pins before replacing the calipers. I cannot think of anything else that would cause it to stick other then the pins, lines being kinked, and the caliper piston. There are piston rebuild kits so you can put new seals and everything on it. I am not sure that air in the lines would cause it to stick. I couldn't tell you on that.

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Old 06-01-2009, 12:02 PM   #9
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Default Re: New brakes wheel shake and loss in brake power

I asked a master tech. He said air in the system could do that. He seemed like he had to think about it. Or imagine that it's possible. He said that when you press in the pedal it will drop far and then get harder if you keep pumping the brakes as it will compress the bubble or air pocket. He said the pedal will be spongy.

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Old 06-01-2009, 12:38 PM   #10
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Default Re: New brakes wheel shake and loss in brake power

I hung the caliper from the spring with a short bungee cable. I will check the brake lines again for leaks. I did not see any. The brake fluid is still the original from the factory. I've never had to add any.

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Old 06-01-2009, 12:44 PM   #11
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Default Re: New brakes wheel shake and loss in brake power

Could try a brake flush. Either way you might as well if you are going to have to replace the calipers.

To be honest I don't think it's the calipers. It would be very very odd for both to go out. Out of curiosity... what pads did you get?

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Old 06-01-2009, 02:11 PM   #12
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Default Re: New brakes wheel shake and loss in brake power

" I made sure to knock loose any rust on the wheel hubs so the rotors would sit properly". Did you remove all scale before putting on the new rotors? It took me about 30 minutes each side with a flat file to get all the rust scale off mine, of course Boston uses alot of salt in the winter. The acceptable runout on the rotors is .04 inch. Doesn't take much scale on the hub to get brake judder.

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