Brake Scraping without braking, after new rotor and pads? - Scionlife.com



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Old 07-13-2010, 05:38 AM   #1  
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Default Brake Scraping without braking, after new rotor and pads?

Hi, I tried to search, but could not find a related thread.

I just replaced my rear brake pads and rotors and also bleeded both lines. The problem is that I can hear scraping sound WITHOUT even applying brakes at all. I can hear the scraping while the car is rolling down the drive way. Did I do something wrong or forget to do any extra steps?

thanks.
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Old 07-13-2010, 06:45 AM   #2  
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My advice would be roll down the driveway while someone else looks/listens try to narrow down where its coming from. If your scraping all the time your caliper may be seized and not releasing. Does it sound like metal on metal or plastic on metal, if you can tell at all that would help too.
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Old 07-13-2010, 06:52 AM   #3  
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your rotor(s) could be loose
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Old 07-13-2010, 07:59 AM   #4  
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Is the e-brake adjusted right? If your e-brake handle doesn't go up too far(or enough) it's adjustment is too tight and the pad is grazing in the drum.
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Old 07-13-2010, 04:53 PM   #5  
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I can't tell if its plastic or metal, but i don't think there is any plastic parts in that area? So i think its metal on metal.

I didn't adjust my ebrakes at all while changing the rotors and pads, it was left where it was. The ebrake does go up pretty high.

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Old 07-13-2010, 05:04 PM   #6  
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Quote:
Originally Posted by 09SocalTC View Post
your rotor(s) could be loose
That might be the reason, but the rotors just pops on without anything to secure it without anything to secure it is there?
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Old 07-13-2010, 07:17 PM   #7  
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the wheel and caliper bracket secure the rotor, so I doubt its a loose rotor. I think its more likely that a pad is loose, you didn't push the piston all the way back, or the slides are seized.
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Old 07-13-2010, 07:59 PM   #8  
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see if you accidently bent the dust sheilds behind the rotor. i run into this alot
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Old 07-13-2010, 07:59 PM   #9  
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it will cause a scraping
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Old 07-13-2010, 08:48 PM   #10  
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i took off the wheel and turn the rotor, it seems like its scraping by the pads? before replacing the pads, I've already pushed in the pistons with a c-clamp and pump the brakes after putting new pads in.

I will check the dust shield.

thanks guys.
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Old 07-14-2010, 12:00 AM   #11  
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doesn't seem like its the dust shields, since there wasn't any sound when i was turning the rotors. did I install the pads incorrectly? or did I pump the pistons too much that its forcing the pads onto the rotors and its not coming back out?
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Old 07-14-2010, 03:17 AM   #12  
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look at the back of the rotor. it may have been rubbing on the backing plate like mine when i replaced my rotors with aftermarket ones. you should see where it is rubbing. find the area then bend that area back with a hammer and chisel. that will take care of the problem.
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Old 07-14-2010, 03:46 AM   #13  
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Quote:
Originally Posted by tc-guy View Post
look at the back of the rotor. it may have been rubbing on the backing plate like mine when i replaced my rotors with aftermarket ones. you should see where it is rubbing. find the area then bend that area back with a hammer and chisel. that will take care of the problem.
do u mean the dust shield? the plate that isn't a whole circle and an opening on the bottom right?
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Old 07-14-2010, 04:52 AM   #14  
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the dust shield is the thin part the backing plate is the thicker part. you can bend the dust shield easily with your hand but the backing will not budge unless you use a hammer and chisel or a pry bar.
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Old 07-14-2010, 04:54 AM   #15  
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Quote:
Originally Posted by bdyer666 View Post
see if you accidently bent the dust sheilds behind the rotor. i run into this alot
this is the issue; mine did this when i first installed new rotors. i just bent it back a bit so that it wouldnt rub
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Old 07-14-2010, 06:34 AM   #16  
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Usually when the noise is related to the dust shield, it usually generates around the hub area. Did you replace your rotors with genuine or aftermarket? If it's aftermarket, maybe the rotors are designed slightly different. Either way, check for scoring around that hub area of the dust shield.

If it isn't the dust shield causing the noise, then check the brake hardware where the brake pads sit on. Usually those things are designed or shaped around the caliper bracket to keep it from walking out of position. But you may have broken parts of it and it may have moved towards the rotors every time you pressed on the brakes. The pads should slide on the hardware, but the hardware stays together on the caliper bracket. Like tcguy mentioned, remove the rotors and inspect both sides, and also inside the drum for scored surfaces. Ofcoarse, it will lead you to the area where you should inspect on the caliper, pads, dust sheild, or even e-brake components.

Another thing is hoping your e-brake did not come apart inside the drum.
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