brake pad wear

PriZeFighter13 · 10-11-2016, 07:18 AM

Ran Time Trials at Road Atlanta this weekend and when I removed my track pads (Pagid RS-29s) the front pads were worn at an angle (like one piston is pushing harder than the other). Anyone seen this before and know what causes it?

JMon · 10-11-2016, 08:08 AM

I really don't have any issues with the RS-29s Some of the best pads I've used. (And I've been through a lot)
I do get some angle, but not much.
What I normally do is after 2 days of running, (And if the rotors are in good shape) swap left to right, inner to outer.
If there is too much grooving, I don't swap, just leave them be.
I also run cooling ducts...

I have bigger issues with my "Tires worn at an angle!" Stock alignment stinks on these cars.

tchiers · 10-11-2016, 09:24 AM

Some taper front-to-back is normal. The leading edge might get a couple of mm more worn than the trailing edge by the time the pads are done. If it's more than that you might have some kind of problem.

CanAutM3 · 10-11-2016, 01:25 PM

I also observed tapered wear on my front RS29. I guess it is the drawback of multi piston calipers. On my first set, I only noticed when the pads were worn, so the taper was quite significant, about ~4mm from leading edge to trailing edge. Since then, I swap the pads inside out when they are half worn. This has resolved the issue for me.

alz0rz · 10-11-2016, 01:48 PM

I measured a 5.5 mm spread on leading to trailing edge of the front pads (RS29).

JMon · 10-11-2016, 07:12 PM

5.5mm is a problem. That is like 1/2 the pad! Shouldn't be that bad. Normal would be like 2mm max if you never rotate.
FYI I measure pad thickness at every swap. The BMW pads are really small length wise.

10-11-2016, 07:18 AM	#1
PriZeFighter13 Private 18 Rep 82 Posts Drives: F80 M3 YMB/BLK 6MT Join Date: Dec 2011 Location: Charleston, SC iTrader: (0) Garage List 2015 BMW M3 [0.00]	brake pad wear Ran Time Trials at Road Atlanta this weekend and when I removed my track pads (Pagid RS-29s) the front pads were worn at an angle (like one piston is pushing harder than the other). Anyone seen this before and know what causes it? __________________ 2015 F80 M3 YMB 6MT 2012 E92 M3 Space Grey DCT - Sold 1991 Z32 300zx 2+2 TT 5MT
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10-11-2016, 08:08 AM	#2
JMon FAST 371 Rep 574 Posts Drives: Porsche GT3 Cup Join Date: Mar 2014 Location: Charlottesville VA iTrader: (0)	I really don't have any issues with the RS-29s Some of the best pads I've used. (And I've been through a lot) I do get some angle, but not much. What I normally do is after 2 days of running, (And if the rotors are in good shape) swap left to right, inner to outer. If there is too much grooving, I don't swap, just leave them be. I also run cooling ducts... I have bigger issues with my "Tires worn at an angle!" Stock alignment stinks on these cars.
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10-11-2016, 09:24 AM	#3
tchiers Private First Class 63 Rep 103 Posts Drives: 2016 F80 M3 Join Date: Jul 2015 Location: Houston, TX iTrader: (0)	Some taper front-to-back is normal. The leading edge might get a couple of mm more worn than the trailing edge by the time the pads are done. If it's more than that you might have some kind of problem.
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10-11-2016, 01:25 PM	#4
CanAutM3 General 21132 Rep 20,742 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	I also observed tapered wear on my front RS29. I guess it is the drawback of multi piston calipers. On my first set, I only noticed when the pads were worn, so the taper was quite significant, about ~4mm from leading edge to trailing edge. Since then, I swap the pads inside out when they are half worn. This has resolved the issue for me. __________________ Porsche 911 turbo 2021 992 GT Silver Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black
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10-11-2016, 01:48 PM	#5
alz0rz What goes here? 454 Rep 1,356 Posts Drives: 2019 G30 M550i Join Date: Aug 2011 Location: Florida Space Coast iTrader: (4) Garage List 2019 BMW M550i [0.00] 2021 BMW M3 Competi ... [0.00] 2019 BMW M5 Competi ... [0.00] 2016 BMW M3 [0.00] 2014 BMW M235i [0.00]	I measured a 5.5 mm spread on leading to trailing edge of the front pads (RS29). __________________ 2019 G30 M550i GBNF: 2021 G80 M3, 2019 F90 M5 Competition, 2016 F80 M3, 2014 F22 M235i
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10-11-2016, 07:12 PM	#6
JMon FAST 371 Rep 574 Posts Drives: Porsche GT3 Cup Join Date: Mar 2014 Location: Charlottesville VA iTrader: (0)	5.5mm is a problem. That is like 1/2 the pad! Shouldn't be that bad. Normal would be like 2mm max if you never rotate. FYI I measure pad thickness at every swap. The BMW pads are really small length wise.
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