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Go Back   E46Fanatics > Tuning & Tech > Suspension & Braking

Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 10-12-2010, 06:12 PM   #1
xixixi
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Pads always rubbing rotor?

Bought a TMS slotted rotor brake kit. When the car is lifted and you spin the front wheels you can hear the brake on. My brakes also squeak really bad every time i hit them? I don't have ABS. Any help thanks!
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Old 10-12-2010, 06:19 PM   #2
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First, prolly more in General to help you.

Second, after you installed, before you started car, did you pump up brakes until they're stiff? You need to do this evidently to ensure the piston then gets 'rolled' back off of rotor.

Third, if the pumping doesn't help, then consider runout as an issue...did you clean off hub and inside of wheel before reinstalling...any dirt/rust could create an 'offness' that would potentially rub.

Fourth, maybe just dust shield...push back all the way around.

Fifth...lug torque needs to be pretty even...not being so might attenuate any runout caused from rust/etc. behind things.

Sixth...if all this fails, might be caliper not retracting fully...and even though that just happened to me...it happened on calipers with 200K on them...and seemingly isn't that common...so either rebuilt calipers or rebuild them...but the rebuilding doesn't seem worth it to me...I tried removing my piston, but it didn't move at all...finally used compressed air to blow it out...so if you have that around, will make it much easier.

HTH

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Old 10-12-2010, 06:25 PM   #3
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Also make sure you take the cap off the brake fluid resivoir when even you push the caliper cylinder in. Also the pads will always be slightly on the rotors. so there will be some resistance. it wont spin freely like skate board wheel bearings.
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Old 10-12-2010, 06:28 PM   #4
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My car did all of the symptoms you described when my piston was seized within the caliper. I had to buy a rebuilt caliper and replace it.
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Old 10-12-2010, 06:29 PM   #5
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Quote:
Originally Posted by mestupmonkydude View Post
Also make sure you take the cap off the brake fluid resivoir when even you push the caliper cylinder in. Also the pads will always be slightly on the rotors. so there will be some resistance. it wont spin freely like skate board wheel bearings.
Not really, monkey...there's only 5/1000" between pad and rotor, and if hitting when just installed, something is wrong...especially since it's all new.

Admittedly, if new pads on old rotors, it could be hitting the lip, and that would wear down (had that before), but you don't want pad on rotor all the time at all...heats up rotor or when hot, wouldn't allow them to cool...result, poorer brakes 'maybe' just when you need all you can get.

If hitting...it's something...and since I just wrote stuff on this elsewhere, OP...search for me and brakes and you'll find what I said...not saying it's all correct...but it is! LOL

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Old 10-12-2010, 06:35 PM   #6
xixixi
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I don;t have dust shields. The brakes were put in a few months ago. Since i did an awd to rwd swap. It seems the pad is wearing on the rotor further than before towards the inside of the rotor. You can see a wear pattern on the inside of the rotor that is maybe .5 mm higher than the rest of the rotor. On the same side i have 1 full degree more neg camber (drivers side, camber pins still in). I'm not sure why. I'm lowered on RL's with a 5mm non hub centric spacer. I also have a vibration above 55mph. I'm thinking it's something harmonic with the wheel spacers or the wheels them selves. Or the brake issue. So the wheels won't spin like skateboard bearings? why is that? why is the brake always on? keep the thoughts coming!
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Old 10-12-2010, 09:40 PM   #7
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Not really, monkey...there's only 5/1000" between pad and rotor, and if hitting when just installed, something is wrong...especially since it's all new.

Admittedly, if new pads on old rotors, it could be hitting the lip, and that would wear down (had that before), but you don't want pad on rotor all the time at all...heats up rotor or when hot, wouldn't allow them to cool...result, poorer brakes 'maybe' just when you need all you can get.

If hitting...it's something...and since I just wrote stuff on this elsewhere, OP...search for me and brakes and you'll find what I said...not saying it's all correct...but it is! LOL

Doug
right when you just install new pads a rotors you will have pushed the caliper piston all the way in and when you mount everything up. there will be a small gap like you said between the pads and the rotors. But when you use them for the first time you push the pads on the rotor and then they are allways sliding on the rotor but its barely touching.
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