Fast and uneven rear pad wear, and brake bias question
#1
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Thread Starter
Fast and uneven rear pad wear, and brake bias question
So i have two main issues that may be related. I am running stock calipers, Hawk DTC60 front pads, Hawk HP+ rear pads. All calipers float well (well-lubricated sliders w/ very high temp grease).
1. My rear pads are wearing pretty quickly... more quickly than the fronts! In addition, the outside pad is wearing faster than the inboard pad. Now the rear dust boots were crispy, and might've been causing piston binding / non-retraction; i just removed them to see if that could have caused brake drag.
Q: Any other thoughts for uneven and accelerated wear?
2. My ABS feels like it kicks in prematurely due to excessive rear bias. This would make me want to switch to a less aggressive rear pad to shift brake bias to the front. However, i'm already seeing high rear wear rates.
Q: Do you all usually run a less aggressive pad in the rear? If not, doesn't that cause the rear end to be unsettled and cause premature ABS activation from rear lockup?
EDIT: Here's a great thread on brake pad stagger, or not stagger.
https://www.rx8club.com/rx-8-racing-...r-bias-253256/
Thanks,
Matt
UPDATE 10/9
Ran DTC-60s all around instead of the DTC-60 front and HP+ rear stagger. Car feels amazing. I can brake deeper without ABS intervention. only one weekend so far so can't comment on longevity yet. But big thanks to the feedback from those in this thread - the brakes feel amazing now!
One theory is that the high initial bite of the HP+ pads caused them to create a strong rearward bias, especially at the beginning of the braking zone. This also led to high rear brake temperatures, and the HP+ is not rated for very high temperatures, accelerating rear pad wear. Now, with the pad compounds in happy harmony, my brake bias is good and i expect to see increased pad life.
I also lubricated the pistons and lubricated the caliper guides, so brake wear should be pretty good going forward.
1. My rear pads are wearing pretty quickly... more quickly than the fronts! In addition, the outside pad is wearing faster than the inboard pad. Now the rear dust boots were crispy, and might've been causing piston binding / non-retraction; i just removed them to see if that could have caused brake drag.
Q: Any other thoughts for uneven and accelerated wear?
2. My ABS feels like it kicks in prematurely due to excessive rear bias. This would make me want to switch to a less aggressive rear pad to shift brake bias to the front. However, i'm already seeing high rear wear rates.
Q: Do you all usually run a less aggressive pad in the rear? If not, doesn't that cause the rear end to be unsettled and cause premature ABS activation from rear lockup?
EDIT: Here's a great thread on brake pad stagger, or not stagger.
https://www.rx8club.com/rx-8-racing-...r-bias-253256/
Thanks,
Matt
UPDATE 10/9
Ran DTC-60s all around instead of the DTC-60 front and HP+ rear stagger. Car feels amazing. I can brake deeper without ABS intervention. only one weekend so far so can't comment on longevity yet. But big thanks to the feedback from those in this thread - the brakes feel amazing now!
One theory is that the high initial bite of the HP+ pads caused them to create a strong rearward bias, especially at the beginning of the braking zone. This also led to high rear brake temperatures, and the HP+ is not rated for very high temperatures, accelerating rear pad wear. Now, with the pad compounds in happy harmony, my brake bias is good and i expect to see increased pad life.
I also lubricated the pistons and lubricated the caliper guides, so brake wear should be pretty good going forward.
Last edited by hufflepuff; 10-11-2017 at 04:48 AM.
#3
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maybe if my rear pads aren't dragging, they won't bite as early? haha.
#5
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DTC30 was originally a dirt track pad and now I think they use it or a variation for street/light track duty too.
HP+ are dirt, they're old technology from 20 yrs ago, dump that crap
You need at least HT10 with a DTC60 front. Dannobre has a ton of track pad experience with his 500+hp track REW-RX8. I'm sure he'll weigh in soon.
Scratch DTC50 for the rear, too high mu
.
HP+ are dirt, they're old technology from 20 yrs ago, dump that crap
You need at least HT10 with a DTC60 front. Dannobre has a ton of track pad experience with his 500+hp track REW-RX8. I'm sure he'll weigh in soon.
Scratch DTC50 for the rear, too high mu
.
Last edited by TeamRX8; 09-15-2017 at 08:11 AM.
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9krpmrx8 (09-15-2017)
#8
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I've run DTC60 front and rear and DTC60 front and HT10 rear
Didn't notice a huge difference between the 2 of them
I find usually that the rears last about twice the fronts....
Never noticed a bias problem...
The rear pads normally wear evenly inside/outside...so I would expect you have something sticking and not working as it should
And the HP+...they melt off when hot like butter.
I would try the DTC 60 front and rear and see how they feel
Didn't notice a huge difference between the 2 of them
I find usually that the rears last about twice the fronts....
Never noticed a bias problem...
The rear pads normally wear evenly inside/outside...so I would expect you have something sticking and not working as it should
And the HP+...they melt off when hot like butter.
I would try the DTC 60 front and rear and see how they feel
#9
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Thread Starter
Thanks for the feedback, everyone. Hawk DTC60s for the rear are on the way. I'll double check to make sure the calipers are sliding well.
#15
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#21
1% evil, 99% hot gas.
iTrader: (21)
Data point: HPS pads with maybe 10 track days on them. Can't get much more even wear than that. 75k miles on original calipers and hardware. My car doesn't see snow or salt and little rain, which makes a difference.
#24
Water Foul
#25
No respecter of malarkey
iTrader: (25)
Perhaps you used too much then. The boot isn't on there to fill up with grease. It's only to keep dirt and water out. If the pin is greased with the proper amount there won't be a bunch of excess to contact the boot.
I actually use a similar product made by a different manufacturer, but couldn't remember the company name
I actually use a similar product made by a different manufacturer, but couldn't remember the company name