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Unread 09-26-2012, 10:52 AM   #1
speeddemon651
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2007 WK 
 
Join Date: Oct 2007
Location: Maryland
Posts: 154
Irregular Brake pad Wear front vs. rear

I've had my 07 WK 3.7, for a year now and since the day I got it, it's always wore through rear brake pads faster than the front. My front's wheels can have alomst no brake dust on them vs. the rear's are completely black. Also I had to replace the rear pads about this time last year and on the RR caliper the outer pad had twice as much meat left vs the inner pad. LR had somewhat od the same case, not as severe.

These problems make me automatically think of two things, air in the lines, which would be noticable and make the pedal soft or brake perportioning valve is bad. Thirdly the rear calipers could also be getting hung up and not properly moving in and out when energized but I coulden't see any signs of that when I replaced the pads before during inspection.

Anyone else have this problem, before I start replacing calipers and taking a hard look at the perportion valve.

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Unread 09-26-2012, 12:15 PM   #2
trax95008
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Join Date: Dec 2005
Location: , California
Posts: 1,201
I think your on the right track. You should be able to feel if the calipers slide on the pins easily or not, you could still clean the grease off and put fresh grease. Also, bleed the lines. It's easy to do. Then give it some time and check the pads again
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Unread 09-30-2012, 08:14 AM   #3
Walt
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2008 WK 
 
Join Date: Oct 2009
Location: Midland, MI
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Quote:
Originally Posted by speeddemon651 View Post
I've had my 07 WK 3.7, for a year now and since the day I got it, it's always wore through rear brake pads faster than the front. My front's wheels can have alomst no brake dust on them vs. the rear's are completely black. Also I had to replace the rear pads about this time last year and on the RR caliper the outer pad had twice as much meat left vs the inner pad. LR had somewhat od the same case, not as severe.

These problems make me automatically think of two things, air in the lines, which would be noticable and make the pedal soft or brake perportioning valve is bad. Thirdly the rear calipers could also be getting hung up and not properly moving in and out when energized but I coulden't see any signs of that when I replaced the pads before during inspection.

Anyone else have this problem, before I start replacing calipers and taking a hard look at the perportion valve.
My factory rear pads were worn out at ~75,000 miles. The inners were thinner than the outers. I replaced both the pads and rotors as they were grooved and pulsing. Definitely lubricate the sliding surfaces with brake lube.

Rear pads wear faster because of the traction control system (and all of its features) applies them automatically without driver action. A local Offroad 4WD shop (and Jeeper) told me that and it means you are driving reasonably when the rears on the new Jeeps wear out first. I never heard that before.

Installed Raybestos Advanced Technology rotors and pads. Everything returned to normal. BTW: I'm at 88,500 miles now and fronts are still good with no sign of performance degradation.
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Unread 09-30-2012, 10:38 AM   #4
jaje
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Inner pads usually wear out faster than outer pads as they normally get less cooling and stay hotter longer - the outside pads are able to lose heat due to outside air coming in through the wheel openings.

As for rears wearing out faster - that is not the norm as least that I know of (rear engined cars this is not uncommon - i.e. the 911). Usually it's the fronts that do most of the braking b/c of weight transfer. Maybe the rear pads are of a compound that wears faster (causing the dust as well). I doubt ABS has anything to do with it unless you are on the binders hard trying to threshold brake (braking to the point before lockup).
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Unread 09-30-2012, 05:45 PM   #5
tjkj2002
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Join Date: Dec 2009
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Quote:
Originally Posted by speeddemon651 View Post
I've had my 07 WK 3.7, for a year now and since the day I got it, it's always wore through rear brake pads faster than the front. My front's wheels can have alomst no brake dust on them vs. the rear's are completely black. Also I had to replace the rear pads about this time last year and on the RR caliper the outer pad had twice as much meat left vs the inner pad. LR had somewhat od the same case, not as severe.

These problems make me automatically think of two things, air in the lines, which would be noticable and make the pedal soft or brake perportioning valve is bad. Thirdly the rear calipers could also be getting hung up and not properly moving in and out when energized but I coulden't see any signs of that when I replaced the pads before during inspection.

Anyone else have this problem, before I start replacing calipers and taking a hard look at the perportion valve.
ESP/traction control is why the rears are wearing faster then the fronts.

The prop valve is a intergrated part of your ABS pump module.
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Unread 04-13-2013, 09:31 PM   #6
ChrisWK
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2005 WK 
 
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My rear pad wear out fast too I am second set rotors turned twice, now I am getting pulsing in the brake pedal so I think I will need rotor too and pads. My front look good.
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Unread 04-13-2013, 09:51 PM   #7
onlyone
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I'm surprised how long mine are lasting. I have 70k on it now with the factory brakes. They still have a lot of material left.
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Unread 04-13-2013, 11:06 PM   #8
NDSU_Bison
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There is another thread or two on this message board where others have noted that the rear brake pads wear out first. My rear pads were replaced at about 100,000 miles and the front are still OK at 120,000. It's hard to think that's due to the ABS/traction control since I'm rarely driving off-road or even in snow.
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