help

unagi · 05-15-2012, 11:27 PM

Hi,

Could you help me identify what this might be and how much it might cost to fix?

Basically, they don't engage completely smoothly. Instead, when you are coming to a stop, everything's fine until just at the point right before it stops, then from a slow roll (1-2 MPH) to the stop, they grab suddenly. It feels almost like they stick at that point.

Also, when you let up on the brakes, if you do it very slowly, when you reach a point where the brakes are just barely engaged, they make a grinding sound as the car begins to slowly roll forward while there is still some brake pressure.

It's not a huge problem. I've been driving it like this for a year, but it's just not a totally smooth engagement. Some drivers may not even notice it. I am planning to sell this car soon and wondering if I should fix it now or let the next owner deal with it. If it's a small problem, I'd fix it though before trying to sell it.

Thanks for any tips!

seank · 05-16-2012, 12:22 AM

Sounds exactly like my wifes e90 wagon, except for the grinding. Its especially bad when the car/brakes are cold.

unagi · 05-16-2012, 12:33 AM

Yep, exactly!

Did you ever diagnose it?

Quote:

Originally Posted by seank

Sounds exactly like my wifes e90 wagon, except for the grinding. Its especially bad when the car/brakes are cold.

seank · 05-16-2012, 09:04 AM

Its been like that since new. Sticky calipers? The brake calipers used for the daily driver? Throw some racing brake pads on it and it wont do it again. I find it mostly annoying when backing out of the driveway at start up, but like I said, its been there since new.

unagi · 05-17-2012, 12:10 AM

Thanks for taking the time to reply. The dealer said it's normal and even took me out in a 750 and a Rolls to show me they make the same sounds. I said my M Coupe doesn't do this and he said it's different brakes. He said perhaps if I sanded the brakes it would lessen the sound, but it wouldn't go away.

So, since I'm planning to sell the car, I think the next owner can do it if he or she wants, not me...

Anyway, it's helpful to hear that even new BMWs make that sound and that racing brakes would make a difference, as I had wondered why I didn't hear that on my ///M.

Cheers!

05-15-2012, 11:27 PM	#1
unagi Private 3 Rep 77 Posts Drives: 2007 Z4 M Coupe Join Date: May 2012 Location: Beijing iTrader: (0) Garage List 2007 BMW M Coupe [0.00]	help - what is this brake problem? Hi, Could you help me identify what this might be and how much it might cost to fix? Basically, they don't engage completely smoothly. Instead, when you are coming to a stop, everything's fine until just at the point right before it stops, then from a slow roll (1-2 MPH) to the stop, they grab suddenly. It feels almost like they stick at that point. Also, when you let up on the brakes, if you do it very slowly, when you reach a point where the brakes are just barely engaged, they make a grinding sound as the car begins to slowly roll forward while there is still some brake pressure. It's not a huge problem. I've been driving it like this for a year, but it's just not a totally smooth engagement. Some drivers may not even notice it. I am planning to sell this car soon and wondering if I should fix it now or let the next owner deal with it. If it's a small problem, I'd fix it though before trying to sell it. Thanks for any tips!
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05-16-2012, 12:22 AM	#2
seank enthusiast 48 Rep 1,695 Posts Drives: e30 m3,e90 wagon,sprinter,z4m Join Date: Dec 2011 Location: sacramento, ca iTrader: (4)	Sounds exactly like my wifes e90 wagon, except for the grinding. Its especially bad when the car/brakes are cold.
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05-16-2012, 09:04 AM	#4
seank enthusiast 48 Rep 1,695 Posts Drives: e30 m3,e90 wagon,sprinter,z4m Join Date: Dec 2011 Location: sacramento, ca iTrader: (4)	Its been like that since new. Sticky calipers? The brake calipers used for the daily driver? Throw some racing brake pads on it and it wont do it again. I find it mostly annoying when backing out of the driveway at start up, but like I said, its been there since new.
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05-17-2012, 12:10 AM	#5
unagi Private 3 Rep 77 Posts Drives: 2007 Z4 M Coupe Join Date: May 2012 Location: Beijing iTrader: (0) Garage List 2007 BMW M Coupe [0.00]	Thanks for taking the time to reply. The dealer said it's normal and even took me out in a 750 and a Rolls to show me they make the same sounds. I said my M Coupe doesn't do this and he said it's different brakes. He said perhaps if I sanded the brakes it would lessen the sound, but it wouldn't go away. So, since I'm planning to sell the car, I think the next owner can do it if he or she wants, not me... Anyway, it's helpful to hear that even new BMWs make that sound and that racing brakes would make a difference, as I had wondered why I didn't hear that on my ///M. Cheers!
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