135i front rotors

andrey_gta · 06-12-2013, 06:51 PM

Hi guys

I have 128i with 135i F+ R calipers on stock 135i pads and rotors. I have had these for about 1000-1500 km.

Im experiencing front rotor wear that is different from rears.
The rears are smooth, the rotor wear does not catch the fingernail.

Both front rotors instead have slight grooves, resulting in the surface not being smooth but wavy enough to catch my fingernail.

What should I check? Do I need to bleed my brakes? Adjust pads...?

My rotor surface Pics, notice how the flash breaks up on the grooves:

gman36 · 06-13-2013, 10:54 AM

In in the same boat except my front rotors look pretty bad

HP Autosport · 06-17-2013, 03:38 PM

This is caused by pad under-run or a pad that is slightly smaller than the rotor surface. You will experience this with OEM or aftermarket pads, it's nothing to worry about.

You can compare different pads and get the pad that may cover the entire surface of the brake rotor, but that is a lot of work, not to mention the many sets of pads you must purchase.

froop · 06-17-2013, 09:49 PM

Quote:

Originally Posted by HP Autowerks

This is caused by pad under-run or a pad that is slightly smaller than the rotor surface. You will experience this with OEM or aftermarket pads, it's nothing to worry about.

You can compare different pads and get the pad that may cover the entire surface of the brake rotor, but that is a lot of work, not to mention the many sets of pads you must purchase.

I don't think he's taking about the lip on the outside and inside edge of the rotor but rather the actual grooves on the used friction surface.

andrey_gta · 06-18-2013, 03:26 PM

Thanks guys. I'll just live with it, next set of rotors and pads I'll look into better options

Dboyz321 · 06-18-2013, 05:59 PM

I have similar grooves on my front left. Took them to a BMW mechanic and they said it was caused by small rocks or dirt getting trapped in gap between rotor and pad. After a couple laps at the 'Ring the groves leveled out somewhat, but wear was on different part of rotor now. Took the car to a different dealer, and they said same thing about the debris and how the break pad may now be wearing the rotor down normally now and it may eventually resolve itself.

I'm not sure if I buy the answer but BMW will not warranty items damaged by dirt or small debris. Both shops said car was still safe. Like you, I have started pricing different rotors (I wanted them anyway).

robert905 · 06-25-2013, 09:54 PM

I've had a number of track days and also had periods of regular street
driving and have seen similar grooves form on new rotors. In my experience it was caused by my choice of a brake pad with a higher friction material and was not caused by stones. Both the pad and the rotor will wear in together and
the groves seem common in a car driven more aggressively even with OEM parts.

andrey_gta · 06-25-2013, 10:08 PM

Quote:

Originally Posted by robert905

I've had a number of track days and also had periods of regular street
driving and have seen similar grooves form on new rotors. In my experience it was caused by my choice of a brake pad with a higher friction material and was not caused by stones. Both the pad and the rotor will wear in together and
the groves seem common in a car driven more aggressively even with OEM parts.

Thanks for the reassurance.

06-12-2013, 06:51 PM	#1
andrey_gta Brigadier General 300 Rep 4,040 Posts Drives: 130i coupé ;) Join Date: Nov 2011 Location: Bimmerpost iTrader: (1) Garage List 2008 BMW 128i [10.00]	135i front rotors - grooved wear; Is this normal? Hi guys I have 128i with 135i F+ R calipers on stock 135i pads and rotors. I have had these for about 1000-1500 km. Im experiencing front rotor wear that is different from rears. The rears are smooth, the rotor wear does not catch the fingernail. Both front rotors instead have slight grooves, resulting in the surface not being smooth but wavy enough to catch my fingernail. What should I check? Do I need to bleed my brakes? Adjust pads...? My rotor surface Pics, notice how the flash breaks up on the grooves: __________________ 128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff "The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is Last edited by andrey_gta; 06-12-2013 at 08:31 PM..
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06-13-2013, 10:54 AM	#2
gman36 First Lieutenant 12 Rep 368 Posts Drives: BMW 135 Join Date: Apr 2013 Location: Nevada iTrader: (3)	In in the same boat except my front rotors look pretty bad
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06-17-2013, 03:38 PM	#3
HP Autosport Supreme Allied Commander 3885 Rep 54,481 Posts Drives: F80 M3 Join Date: Mar 2007 Location: Santa Barbara, AP, Brembo, GIAC, Koni, Ohlins, Performance Friction, www.hpautosport.com iTrader: (36)	This is caused by pad under-run or a pad that is slightly smaller than the rotor surface. You will experience this with OEM or aftermarket pads, it's nothing to worry about. You can compare different pads and get the pad that may cover the entire surface of the brake rotor, but that is a lot of work, not to mention the many sets of pads you must purchase.
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06-18-2013, 03:26 PM	#5
andrey_gta Brigadier General 300 Rep 4,040 Posts Drives: 130i coupé ;) Join Date: Nov 2011 Location: Bimmerpost iTrader: (1) Garage List 2008 BMW 128i [10.00]	Thanks guys. I'll just live with it, next set of rotors and pads I'll look into better options __________________ 128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff "The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is
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06-18-2013, 05:59 PM	#6
Dboyz321 Enlisted Member 0 Rep 40 Posts Drives: BMW 135i Join Date: Feb 2013 Location: Germany iTrader: (0)	Grooves I have similar grooves on my front left. Took them to a BMW mechanic and they said it was caused by small rocks or dirt getting trapped in gap between rotor and pad. After a couple laps at the 'Ring the groves leveled out somewhat, but wear was on different part of rotor now. Took the car to a different dealer, and they said same thing about the debris and how the break pad may now be wearing the rotor down normally now and it may eventually resolve itself. I'm not sure if I buy the answer but BMW will not warranty items damaged by dirt or small debris. Both shops said car was still safe. Like you, I have started pricing different rotors (I wanted them anyway).
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06-25-2013, 09:54 PM	#7
robert905 Registered 0 Rep 4 Posts Drives: bmw135 Join Date: May 2013 Location: oaville,ontario,canada iTrader: (0)	I've had a number of track days and also had periods of regular street driving and have seen similar grooves form on new rotors. In my experience it was caused by my choice of a brake pad with a higher friction material and was not caused by stones. Both the pad and the rotor will wear in together and the groves seem common in a car driven more aggressively even with OEM parts.
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