[RXtacy]

I have also notice tapered pad wear on one side (top to bottom) on DTC-60s. I didn't notice it at first when I pulled them so I'm not sure which side they were on. I'll try and get pics tonight.

[seanblurr]

This isn’t for the most recent issue posted up, but after taking some temps the right side calipers are seeing about a 100* increase in temps compared to the left.

[mbar]

Originally Posted by RXtacy

I have also notice tapered pad wear on one side (top to bottom) on DTC-60s. I didn't notice it at first when I pulled them so I'm not sure which side they were on. I'll try and get pics tonight.

Look at the pistons marks on the backing plate. Since the pistons have different sizes you could tell if the pad was inside or outside.

[RXtacy]

Originally Posted by mbar

Look at the pistons marks on the backing plate. Since the pistons have different sizes you could tell if the pad was inside or outside.

The inner and outer pads from one caliper are both tapered, I've also run them on both sides of the car so they all have both piston marks.

Both pads are 2-3mm thinner on one edge vs the other. It's hard to tell in the picture, but when you have them sitting on top of each other it's quite apparent.




Top and bottom edge of same pad

[Boost Creep]

Is it always the top of the brake pads that is thicker?
Wondering if an air bubble is the cause.
Air going to the top and being compressible would have less braking force from the top piston.

[Boost Creep]

Another thought, the lower portion of the pads makes initial contact with the rotor might cause the tapered wear from track use.

[Rutkowski]

Originally Posted by Boost Creep

Is it always the top of the brake pads that is thicker?
Wondering if an air bubble is the cause.
Air going to the top and being compressible would have less braking force from the top piston.

This sounds plausible since the fluid is the only part that is shared between both sides. For me the issue is identical on the right and left side calipers. Haven’t taken them apart yet, this might bring new insights..

[RXtacy]

Originally Posted by Boost Creep

Is it always the top of the brake pads that is thicker?

That's what I'm not sure about since I can't verify which side of the car they were on.

Wondering if an air bubble is the cause.
Air going to the top and being compressible would have less braking force from the top piston.

I suppose that's possible. I bleed my calipers before each track day with a pressure bleeder, but I guess an air bubble could have got in there.

Originally Posted by Boost Creep

Another thought, the lower portion of the pads makes initial contact with the rotor might cause the tapered wear from track use.

That was my initial thought, that maybe the leading edge took more abuse, but I would have expected both sides of the car to look similar

[Rutkowski]

Originally Posted by RXtacy

That's what I'm not sure about since I can't verify which side of the car they were on.



I suppose that's possible. I bleed my calipers before each track day with a pressure bleeder, but I guess an air bubble could have got in there.



That was my initial thought, that maybe the leading edge took more abuse, but I would have expected both sides of the car to look similar

For me it’s both sides of the car and in both cases bottom a good 3mm more worn than top. In case that helps with the analysis.

Why would the lower end be the leading edge? I don’t quite get the concept, would one piston have more force than the others?

[R3ctivision]

I think tapered wear is normal. I see it on my car as well, all four front pads, worn more on the bottom (leading edge). I think it is deliberately engineered that way to keep the brakes quiet but not quite sure. I believe it would be caused by the different piston sizes in the caliper.

[Boost Creep]

Originally Posted by R3ctivision

I think tapered wear is normal. I see it on my car as well, all four front pads, worn more on the bottom (leading edge). I think it is deliberately engineered that way to keep the brakes quiet but not quite sure. I believe it would be caused by the different piston sizes in the caliper.

That is true. The smaller caliper piston will have less braking force than a larger piston.
So, if the 1LE calipers have different size caliper pistons with the smaller at the top and a larger on the bottom, there's your tapered wear. Normal street braking probably wouldn't show a taper, but the heavy repeated track braking would show the taper.

[Rutkowski]

Originally Posted by Boost Creep

That is true. The smaller caliper piston will have less braking force than a larger piston.
So, if the 1LE calipers have different size caliper pistons with the smaller at the top and a larger on the bottom, there's your tapered wear. Normal street braking probably wouldn't show a taper, but the heavy repeated track braking would show the taper.

Thanks a lot for the explanation! Didn’t know that they were different sizes. That makes a lot of sense. My mechanic just told me that also the piston seals are a bit cooked, causing the pistons to stand out slightly. Has anyone changed the seals for the 1LE J6M brakes? I can’t find a part number so far.. thanks!

[Boost Creep]

Didn't see any rebuild kits, but new calipers are about $344 each.
Worse comes to wurst*, replace the calipers while looking for a rebuild kit for the originals. This way the car is never really down waiting on a caliper rebuild in the future.





*a little Germany pun.

[Rutkowski]

Originally Posted by Boost Creep

Didn't see any rebuild kits, but new calipers are about $344 each.
Worse comes to wurst*, replace the calipers while looking for a rebuild kit for the originals. This way the car is never really down waiting on a caliper rebuild in the future.

*a little Germany pun.

Well in this case the wurst is still edible I believe
It’s actually the dust boots and not caliper seals (that was my bad.. translation isssues ^^). My mechanic said it’s not terrible, so I’ll see if I can identify the right boots on rock auto. In the meantime I think I’ll check how bad the wear is and go from there (race pads should already be an advantage over the DS 2500 from before). Will know a bit more after picking it up from the mechanic tonight and going in detail.
Thanks for all the insights guys