Wilwood rotors question

[GRNOVA]

I have 75 miles on my front Wilwood rotors and they look shot already. They are GT rotor 160-83988/98

Here is apicture.
https://static1.pt-content.com/images/pt/2015/09/C3A6122EC1FA4101A720F38A64635679_zpsurbm-1.jpg (http://s300.photobucket.com/user/tnt342/media/Mobile%20Uploads/C3A6122E-C1FA-4101-A720-F38A64635679_zpsurbm8cq3.jpg.html)

the calipers seem to be hanging up about every 3 to 4th push of the pedal. And the inside Pistons seem further out than the outside.

https://static1.pt-content.com/images/noimg.gif (http://s300.photobucket.com/user/tnt342/media/1B86AF4B-BFAC-412A-9195-E80404E726BA_zpstvbsmhlq.jpg.html)

[andrewb70]

Tim,

What pads are you using? Also, did you shim the caliper so that it is centered over the rotor?

Andrew

[GRNOVA]

Bp-10 pads and within .040 of being centered.

[andrewb70]

Bp-10 pads and within .040 of being centered.

I don't know how the BP-10 pads are, but the instructions with my Baer kit wanted me to center the caliper to within .005". 40 thousands sounds like a lot.

Are the Bp-10 pads aggressive? The wear pattern looks like the pads are taking quite a bit of material off the rotors.

Andrew

[Schwartz Performance]

Andrew- the BP10 are one of the most mild pads, relatively. They are what come in all the brake kits Wilwood sells. Definitely shouldn't make your rotor look like this after just 75 miles! If the caliper is hanging up, may want to check first that the master cylinder is fully retracting.

-Dale

[TheJDMan]

I agree, .040 seems like a LOT. What does the inboard side of the rotor look like? I can only see one pic. My thinking is if the caliper is not centered properly over the rotor that all the wear is on the outboard side and likely no wear on the inboard side because the pads are not able to move away from the rotor.

[GRNOVA]

Here are pics I took today both sides are worn pretty evenly. I am working with Wilwood to help figure this out.
http://s300.photobucket.com/user/tnt342/library/disc%20brakes

[iadr]

I agree, .040 seems like a LOT. What does the inboard side of the rotor look like? I can only see one pic. My thinking is if the caliper is not centered properly over the rotor that all the wear is on the outboard side and likely no wear on the inboard side because the pads are not able to move away from the rotor.


Centering is definitely NOT your problem. If fact it would take a lot more than 40 thou to even produce a subtle symptom.

[Apogee]

Here are pics I took today both sides are worn pretty evenly. I am working with Wilwood to help figure this out.
http://s300.photobucket.com/user/tnt342/library/disc%20brakes

It sounds like Wilwood has your back, but please let us know what you find out...that's a lot of wear for 75 miles unless it's 75 of the most hardcore miles you can imagine with some motorsport compound pads...then it's about right.

While you certainly want the caliper centered over the rotor closer than it is, it shouldn't be contributing to the wear issue at hand. We've got some .005" shims for the M14 mounting bolts if you need to shim the radial mounts out. Hopefully that's the case since you really can't shim them inward.

Tobin
KORE3

[iadr]

It sounds like Wilwood has your back, but please let us know what you find out...that's a lot of wear for 75 miles unless it's 75 of the most hardcore miles you can imagine with some motorsport compound pads...then it's about right.

While you certainly want the caliper centered over the rotor closer than it is, it shouldn't be contributing to the wear issue at hand. We've got some .005" shims for the M14 mounting bolts if you need to shim the radial mounts out. Hopefully that's the case since you really can't shim them inward.

Tobin
KORE3


Tobin, you are a major contributor here and I'm not. BUT.

Radial shimming is not going to center the rotor.
And can you please explain why you were have any worry with less than say 0.16" non centered rotor? We are dealing with a hydraulic caliper. They come out under pressure, stop when they contact and the seals retract them to the clearance point.
To sell for any reason 0.005" shims (axial or radial)...well... Well... I'll be very polite and say you need to offer an explanation. A really good one I haven't thought of in nearly 30 years in automotives.

[TheJDMan]

After seeing the pics of the inside rotor surface I don't think centering is the issue, something else is going on and I would be interested in what Wilwood has to say.

[Apogee]

Tobin, you are a major contributor here and I'm not. BUT.

Radial shimming is not going to center the rotor.
And can you please explain why you were have any worry with less than say 0.16" non centered rotor? We are dealing with a hydraulic caliper. They come out under pressure, stop when they contact and the seals retract them to the clearance point.
To sell for any reason 0.005" shims (axial or radial)...well... Well... I'll be very polite and say you need to offer an explanation. A really good one I haven't thought of in nearly 30 years in automotives.

DSE front end with C6 knuckles, so the brake mounting hardware is M14. The M14 mounting bolts attach the radial mounts to the knuckles, which control the axial spacing, not radial spacing. Shims between the knuckle and radial mount bracket will push the bracket, and in turn the caliper, outward for axial alignment purposes. The Wilwood FNSL calipers use 3/8" radial mount studs IIRC...sorry if I wasn't clear in my previous statement. FWIW, it was clear in my mind when I wrote it :P

Tobin
KORE3

[GRNOVA]

I got an email back yesterday from Wilwood asking for numbers on the rotors, pads and the calipers. I checked the MC to see if it might not be returning all the way but it is, also wouldn't that affect the rear ones just the same...the rear ones still look new!



https://static1.pt-content.com/images/pt/2015/09/ADD8AF2DDD6F425284BB0BB7F5DEDCB2_zpsec0q-1.jpg (http://s300.photobucket.com/user/tnt342/media/disc%20brakes/ADD8AF2D-DD6F-4252-84BB-0BB7F5DEDCB2_zpsec0q35m7.jpg.html)

https://static1.pt-content.com/images/pt/2015/09/96529BDD0B2B4CAAB5878A7901BA0185_zpsdfav-1.jpg (http://s300.photobucket.com/user/tnt342/media/disc%20brakes/96529BDD-0B2B-4CAA-B587-8A7901BA0185_zpsdfavuut8.jpg.html)

https://static1.pt-content.com/images/pt/2015/09/B1056A6DB8FB4B339378CEDA62EEC655_zpsgrvp-1.jpg (http://s300.photobucket.com/user/tnt342/media/disc%20brakes/B1056A6D-B8FB-4B33-9378-CEDA62EEC655_zpsgrvp0dsc.jpg.html)

https://static1.pt-content.com/images/pt/2015/09/C93BACD8EA1F4231BCF39F86973546DA_zpsldu2-1.jpg (http://s300.photobucket.com/user/tnt342/media/disc%20brakes/C93BACD8-EA1F-4231-BCF3-9F86973546DA_zpsldu2a0mr.jpg.html)

https://static1.pt-content.com/images/pt/2015/09/D550F3DF13C94D5B968195CDDBFB8B8A_zpsq7t1-1.jpg (http://s300.photobucket.com/user/tnt342/media/disc%20brakes/D550F3DF-13C9-4D5B-9681-95CDDBFB8B8A_zpsq7t1gayj.jpg.html)