Rear Brake rotor tolerance? - BMW Luxury Touring Community
 
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post #1 of 6 Old May 22nd, 2009, 4:08 pm Thread Starter
 
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Rear Brake rotor tolerance?

So according to the manual I have the rear rotor is supposed to be 6.5MM thick to be within spec.

Mine is like 4MM and I have 17k miles on it. I think my manual is wrong as the pads are worn but not gone.

So, what is the proper thickness?

BTW, the dealer told me to pound sand about the replacement by BMW. I was magically .001 MM out of spec.

They would want to do the job anyway. Since I have the rear end apart to do the weep hole I thought I would get this done as well.
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post #2 of 6 Old May 22nd, 2009, 4:12 pm
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Re: Rear Brake rotor tolerance?

Yup minimum is 6.5 MM for the rear rotor. I replaced mine @ 42,000 miles and it was 6.2MM. I got a free spare rotor when I bought a spare rear drive.If your was at 4 MM thick @ 17,000 I would suspect a dragging rear caliper. My first set of rear pads went @ 30,000

I forgot to add the new one was right @ 7.0 MM

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Last edited by jzeiler; May 22nd, 2009 at 8:48 pm.
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post #3 of 6 Old May 22nd, 2009, 5:21 pm Thread Starter
 
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Re: Rear Brake rotor tolerance?

Hmmmm, I wonder if I measured it wrong? No matter as I was going to replace the rotor anyway as I was tired of the cowbell so no biggie there.

how do I check the caliper to ensure it is not draging?
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post #4 of 6 Old May 22nd, 2009, 7:57 pm
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Re: Rear Brake rotor tolerance?

Something is wrong with your measurement. To grind that much off the rotor in 17K and not have gone through at least one set of pads tells me that your wrong about what is left.

The reason the rotor clangs is because it is free to move and you hear a metal to metal sound. To hear that sound there has to be movement.

I had to change mine a few years ago and it would only make noise at slow speed hitting bumps. As soon as the rear brake was applied at all it did not make any noise.

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post #5 of 6 Old May 22nd, 2009, 8:47 pm
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Re: Rear Brake rotor tolerance?

To check for brake drag, or anything else, use your five senses. Listen, look (check mileage too), smell, taste (probably not necessary), and most important, feel the disc when you stop riding. The heat you feel will give you some parameters to work with.
The LT rear brake is a pain in the rear.I use water to flush the brake dust off and to quiet the squeal. Make sure the disc is cool before putting water on it You may be able to "just clean it up" with water and then apply brake grease to the pads (brake disassembly required). It worked for me, I hope for you also.
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post #6 of 6 Old May 23rd, 2009, 9:05 am
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Re: Rear Brake rotor tolerance?

Quote:
Originally Posted by seahabit
To check for brake drag, or anything else, use your five senses. Listen, look (check mileage too), smell, taste (probably not necessary), and most important, feel the disc when you stop riding. The heat you feel will give you some parameters to work with.
The LT rear brake is a pain in the rear.I use water to flush the brake dust off and to quiet the squeal. Make sure the disc is cool before putting water on it You may be able to "just clean it up" with water and then apply brake grease to the pads (brake disassembly required). It worked for me, I hope for you also.
If you suspect the rear brake is dragging, don't just grab it when you check it! Put some water on your finger tip and "dab" the rotor quickly. If it sizzles, you have a problem ... and you don't have a burned finger!

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