Avoid Wilwood brakes - MustangForums.com



S197 Handling Section For everything suspension related, inlcuding brakes, tires, and wheels.
Sponsored by:
Sponsored by:

Reply
 
 
 
Thread Tools Search this Thread
Old 08-12-2017, 07:22 PM   #1
flash_xx
3rd Gear Member
Thread Starter
 
flash_xx's Avatar
 
Join Date: Oct 2007
Location: Santo Domingo, Dominican Republic
Posts: 911
Default Avoid Wilwood brakes

So, today I went to racing school. There were only 5 of us so plenty of instructor time. A 911 Turbo, a BRZ, a supercharged S2000, a C6 Z06 and my car. The Honda had Wilwood 6 piston calipers and two piece rotors in the front. The Wilwoods were less than 3 months old and after the car started developing a grinding sound we took off the wheels. Turns out the inside pistons wore through the pads much faster than the outer pistons and gouged into the rotors,but not only that, the pistons on the outer side of the calipers didn't push equally so the outer pad was bent in the middle on both sides. I was told the same thing happened previously to another car and Wilwoods reply according to the owner was "You're braking too hard" WTF? Aren't they supposed to be high performance brakes? I'll see if I can get some photos to upload. I'd never seen a pad bent in the middle before. The S2000 isn't even a heavy car.

Good thing I opted for the OEM Brembos. The instructor said my car had the best brakes after the 911. The Z06 had brake fade after one lap, but I think that was due to fluid. Motul RBF600 is definitely the best.
flash_xx is offline   Reply With Quote
Old 08-12-2017, 10:25 PM   #2
proeagles
3rd Gear Member
 
Join Date: Dec 2008
Location: LA
Posts: 511
Default

I've used Wilwood brakes with no issues. Chances are they weren't installed properly. With fixed calipers, it is absolutely necessary to insure the rotor is dead center in the caliper. From your description, the pads seem to be the bigger problem as there is no way the pistons should have bored through the backing plates.
proeagles is offline   Reply With Quote
Old 08-13-2017, 08:17 PM   #3
flash_xx
3rd Gear Member
Thread Starter
 
flash_xx's Avatar
 
Join Date: Oct 2007
Location: Santo Domingo, Dominican Republic
Posts: 911
Default

The pads are the ones that came with the Wilwood kit. Do you road race the car though? Because the strain is waaaay beyond anything you can muster on the street.
flash_xx is offline   Reply With Quote
Old 08-14-2017, 09:37 AM   #4
proeagles
3rd Gear Member
 
Join Date: Dec 2008
Location: LA
Posts: 511
Default

I drove the car in HPDE events.
proeagles is offline   Reply With Quote
Old 08-14-2017, 01:12 PM   #5
flash_xx
3rd Gear Member
Thread Starter
 
flash_xx's Avatar
 
Join Date: Oct 2007
Location: Santo Domingo, Dominican Republic
Posts: 911
Default

DRIVER SIDE (LEFT)



PASSENGER SIDE (RIGHT)

​​​

Last edited by flash_xx; 08-21-2017 at 03:33 AM. Reason: clarify caliper position
flash_xx is offline   Reply With Quote
Old 08-14-2017, 02:26 PM   #6
proeagles
3rd Gear Member
 
Join Date: Dec 2008
Location: LA
Posts: 511
Default

I think the calipers are clearly not mounted correctly. They are definitely not centered on the rotor. Can't tell for sure, but the pistons should be different sizes and apply force in a certain sequence.
proeagles is offline   Reply With Quote
Old 08-14-2017, 02:39 PM   #7
proeagles
3rd Gear Member
 
Join Date: Dec 2008
Location: LA
Posts: 511
Default

Does that rotor exit out the bottom of that caliper? I'm assuming that it does as I think I'm looking at the left front on top and the right front on the bottom. If mounted correctly in that fashion, the only problems appear to be incorrect pads for the application and the calipers not centered on the rotor.
proeagles is offline   Reply With Quote
Old 08-14-2017, 03:01 PM   #8
Derf00
6th Gear Member
 
Join Date: Feb 2005
Location: AZ
Posts: 10,912
Default

Quote:
Originally Posted by proeagles View Post
I think the calipers are clearly not mounted correctly. They are definitely not centered on the rotor. Can't tell for sure, but the pistons should be different sizes and apply force in a certain sequence.
I think that's an optical illusion because of the wear in the pads. If you use two straight edges and align one with one side of the rotor and the other with the caliper on the same side of the rotor, the calipers appear aligned.

Anyways, it looks like one of the pistons was frozen (side where the weird wear occurred and the piston directly next to the area with the least wear on that side). You'd have to take the calipers off and test them to see if that's the case. But, that's my guess.

Depending on how the calipers are set up, i'm guess it's near the top of the caliper. If the they weren't bled properly or the fluid has too much moisture in it, you will get a pocket of air/water in that area which would keep the piston from working like it should or worse, seize it. Water doesn't compress and air/steam compresses at a different rate than brake fluid.

Just some thoughts.
Derf00 is offline   Reply With Quote
Old 08-14-2017, 05:48 PM   #9
proeagles
3rd Gear Member
 
Join Date: Dec 2008
Location: LA
Posts: 511
Default

In the top picture you can see the line in the middle of the caliper is off center to the vent hole in the rotor. What this should have done is wear one pad faster than the other, not necessarily tapered. If the rotor exits at the top of the caliper, the calipers are backward and the would cause the tapered wear. I think most of the fault lies in operator error. Having said that, I am a bigger fan of the Brembo and Stop Tech brake system.
proeagles is offline   Reply With Quote
Old 08-15-2017, 12:41 AM   #10
flash_xx
3rd Gear Member
Thread Starter
 
flash_xx's Avatar
 
Join Date: Oct 2007
Location: Santo Domingo, Dominican Republic
Posts: 911
Default

If it was the installation that would account for the inner side wearing out faster than the outer, but the pads wearing out at the bottom point to a caliper issue. Those are the Pads that come with the Wilwood kit. I don't think it was air or moisture because the brakes did not fade at all. He only noticed the problem when they started grinding.

The Stoptechs are nice but with the Brembos available for much less why buy non-oem? Plus, there is a broader pad selection with the Brembos (as long as you stick with the 4 piston ones). I thought about getting the 6 piston Brembos but honestly they are overkill. Too big and heavy and no pads to choose from yet.

Last edited by flash_xx; 08-15-2017 at 09:46 AM.
flash_xx is offline   Reply With Quote
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising
Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 04:17 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.