Brake Wear issue? - Subaru Enthusiasts Car Club of the Sierras

MattR · 2006-10-23, 01:25 PM

I am talking to a friend of a friend about his brake wear on his Sti. He does track days and daily drives it. He's finding that his inside front pads are wearing at almost a 2 to 1 rate as the outside front pads? What would cause this? Old Fluid? Deeper problem? or is this normal? I've never noticed wear differences like that.

Any input would be great.

NevadaSTi · 2006-10-23, 01:40 PM

When I replaced my fronts, both the inside and outside pads had about equal wear.

Kevin M · 2006-10-23, 01:56 PM

Sounds like someone is bleeding his brakes improperly maybe? Air bubbles on one side prevent each side from getting the same force from the pedal?

MPREZIV · 2006-10-23, 03:00 PM

I'd def say that he's not getting proper pressure on both sides of the caliper. Possibly some restriction, or *maybe* air in the brakes, but I'd be apt to think that would decrease pressure in the WHOLE system, and not just one side of each front pad... I dunno, maybe it could. How the f*ck do you get air stuck in just ONE side of a two sided caliper tho?

Dean · 2006-10-23, 04:40 PM

Sticky/stuck/wedged/frozen piston (Not likely if same both sides)

Damaged/clogged crossover tube. (Not likely if same both sides)

Contamination of the outer pads. (grease or other CF lowering / pad damaging compound. Could include "tire dressing" or "wheel cleaner") (Likely if same both sides)

Bad fluid or air in the caliper would affect the whole channel, not just one side of one caliper. How is rear wear?

Same on both fronts? If LI+LO = RI+RO or close to it then the system is probably OK. I'd focus on the pistons/pads on the side with the least wear and the crossover tube since lower wear is on the outside. One of those is likely where the issue is.

sperry · 2006-10-23, 05:56 PM

How's this guy's wheel bearings? Excessive play could mean more drag on one half of the caliper thus wearing the pads unevenly. Does he have excessive pad knock-back on track?

2006-10-23, 01:25 PM	#1
MattR El Matador Real Name: Matt Join Date: Dec 2002 Location: Reno, NV Posts: 10,660 Car: 2012 Toyota Tacoma Class: ?	Brake Wear issue? I am talking to a friend of a friend about his brake wear on his Sti. He does track days and daily drives it. He's finding that his inside front pads are wearing at almost a 2 to 1 rate as the outside front pads? What would cause this? Old Fluid? Deeper problem? or is this normal? I've never noticed wear differences like that. Any input would be great. __________________ "Dallas..We have a problem.”

2006-10-23, 01:40 PM	#2
NevadaSTi EJ251 Real Name: Brian Join Date: Mar 2005 Location: Minden, Nv. Posts: 989 Car: 1994 Toyota 4Runner Some mistakes are too much fun to only make once	When I replaced my fronts, both the inside and outside pads had about equal wear. __________________ The last living thing on earth will be me. I'll step on the last cockroach.

2006-10-23, 01:56 PM	#3
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	Sounds like someone is bleeding his brakes improperly maybe? Air bubbles on one side prevent each side from getting the same force from the pedal? __________________ FWD is the new AWD

2006-10-23, 03:00 PM	#4
MPREZIV Token Real Name: Le Stig Afrique? Join Date: Jun 2005 Location: sitting next to a big yellow box Posts: 3,589 Car: 2001 Impreza 2.5 RS Class: 05 TDSP No, I won't work on your car. F your car*	I'd def say that he's not getting proper pressure on both sides of the caliper. Possibly some restriction, or maybe air in the brakes, but I'd be apt to think that would decrease pressure in the WHOLE system, and not just one side of each front pad... I dunno, maybe it could. How the fck do you get air stuck in just ONE side of a two sided caliper tho? __________________ "...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can fck for HOURS..."

2006-10-23, 04:40 PM	#5
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	Sticky/stuck/wedged/frozen piston (Not likely if same both sides) Damaged/clogged crossover tube. (Not likely if same both sides) Contamination of the outer pads. (grease or other CF lowering / pad damaging compound. Could include "tire dressing" or "wheel cleaner") (Likely if same both sides) Bad fluid or air in the caliper would affect the whole channel, not just one side of one caliper. How is rear wear? Same on both fronts? If LI+LO = RI+RO or close to it then the system is probably OK. I'd focus on the pistons/pads on the side with the least wear and the crossover tube since lower wear is on the outside. One of those is likely where the issue is. __________________ I am a Commodore PET --- Now get off my lawn you kids...

2006-10-23, 05:56 PM	#6
sperry The Doink Real Name: Scott Join Date: Nov 2002 Location: Portland, OR Posts: 20,335 Car: '09 OBXT, '02 WRX, '96 Miata Class: PDX/TT-6 The way out is through	How's this guy's wheel bearings? Excessive play could mean more drag on one half of the caliper thus wearing the pads unevenly. Does he have excessive pad knock-back on track? __________________ Is you is, or is you ain't, my con-stit-u-ints?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Yet Another Brake Pad Thread.	Dean	Technical Chat	83	2009-05-10 02:43 PM
Pro Parts USA (Brake stuff)	Dean	Reviews	13	2008-03-12 02:04 PM
Stainless steel brake lines?	Ezdno	Technical Chat	13	2006-08-06 02:01 PM
Uneven wear of brake pads, bad?	SlickNick112	Technical Chat	11	2005-03-09 01:26 PM
Brake pads	ZER026D	Technical Chat	12	2003-03-24 06:50 PM