Hey Guys, just a PSA. I recently purchased Wortec's new 326MM rotors. The front are awesome, but they did not test the contact surface for the rear rotors. Just had these installed & the Pads are obviously destroyed now because it is just applying brake force to the lip (Which is higher than the rear of the disk) instead of the actual disk. Waiting on a reply from them, but just a warning. Till they resolve this, don't buy the new 326mm rear rotors.

For those who know more about brakes, since its not applying the force evenly now, is this going to do damage to my rear calipers? I don't have the old rears anymore..

 

I wouldn't immediately conclude that the pads are destroyed. I also don't think the force is applied unevenly. The pads look to be still running parallel to each other, even if the inner edge is going past the intended swept area of the rotor.

It's not right, but doesn't seem dire to me. That said, you need to decide how you feel about it. You said you had them installed. Have you asked your shop if they have any safety concerns? And perhaps they still have the old rotors. When I had a shop, scrap metal pickup was not all that frequent.

 

They have checked for their scrap and its not there But its definitely contacting on a angle if you look on the outside of the disk there is minor abrasion from it touching. The issue is the inner edge lip is higher than the rear of the rotor. So its basically wearing just parts of the pad right now

 

On my rotors, that now have a few tens of thousands of miles on them, the step seems less than a millimeter. The pads will conform to that given time, and probably not much time at that. One of the design advantages of disc brakes is that they'll wear in and self-adjust, and they have tolerance for uneven rotor surfaces.

Have you had the shop look at the current situation? You're the one driving, and should be comfortable doing so. I'm trying to map my experience to a pair of pictures, but they can make an in-person assessment.

 

the Issue is that because its not designed for the pad to contact. It was never machined to the same tolerance. You have the 326 or 370?

The shop said, it'll work. But it gives vibration during braking now. Not to mention I basically have 1cm rear rotors now as thats all that getting touched lol
How much of a overlap does your pads have onto the lip?

To be clear absolutely no issue on the fronts, the pads contact the entire rotor surface

 

I have the Super Performance brakes, so the 376mm rears. The pad contact is correct front and rear. It's hard to tell from the pictures, but it looks like you've got about a 1mm step to the area of the rotor that is not supposed to be swept area. The narrow part of the pad contacting that should wear fairly quickly and they the rest of the pad will contact full width. I'd expect the vibration will abate at that point but as I said in my first response, it's still not right. I'm glad to hear your shop confirms it's not a safety issue, but Wortec needs to weigh in on this.

 

Whether the pads will wear accordingly is immaterial - the rotor has a contact patch and that pad is well outside of the normal range of contact and should not be in contact with the hub/center and at the cost of those rotors, there should no vibration or operational issues assuming they were meant for that appplication..

 

Yeah Thats my issue with the cost of the rotors, they should actually work lol.. Confirmed with the mechanic the rear pads that were replaced were identical. And they just checked them now & under light to moderate braking the pads do not even contact the disk. They only touch that lip.

I've emailed wortec & waiting for a response or if they can weigh in here

 

Looks like a simple case of wrong diameter rotors...or am I being simple? ;-)...

Or should I say, correct diameter of rotors, but incorrect diameter of contact area perhaps?

 

These they made specifically to replace the 326MM rear jaguar rotors.

 

If anyone has the 326MM rear rotors can you measure the contact surface of the rotor and post it here?

 

No one is saying that's not the case. He was originally asking if his calipers would be damaged while he waits to hear from Wortec. The swept area of that rotor and the pad clearly don't match.

 

Pardon me for not addressing the question sufficiently; however, the OP clearly states it is "just a PSA". Yes, long term mis-alignment of the pad/rotor and basically having the wrong part or an incorrectly installed part will eventually cause damage to numerous components including the rotor and why take the chance? Will they blow up in 50 miles, probably not, but I guarantee it wont prolong the life of the caliper/pad etc. While I don't manage and F-1 race team, I am comfortable saying that installing incorrect parts on any car is bad and if you find a technician that says something like: "it probably wont be too bad or it might work", you may want to select another technician - I'll do better with my initial post next time.

 

I think we're at cross-purposes here. He's asking about short-term, while he waits for an answer from the manufacturer of the rotors. I see no harm coming to the caliper. The rotor is wrong and should be replaced with one of proper dimensions, and when that happens, new pads should go in as well.

 

They may well be made specifically for the 323 rear rotor cars, but possibly the company made a manufacturing error and/or supplied the wrong diameter rotors.

Did you fit brand new pads ?

 

I'm thinking they didn't properly fit test these as covid 19 has caused issues with many businesses. I did get the rotors from their very first batch.

Yup, brand new porterfield rs4s

 

Indeed - I have questioned parts before and usually get a response like: “we have never done that.......” and while manufacturers may right often, they aren’t all the time. I ordered Porterfield pads, they didn’t fit, they overnighted a new set, didn’t fit - I questioned them the first time and said maybe they put the wrong ones in the box “no way we did that....” - 3 overnight packages later - “we put the wrong pads in the box on the first set....”

and yes, maybe no damage short- term but can you say that definitively? And if again, why knowingly “try it out and see”?

 

I was thinking the same thing, that it could be the pads. But the mechanic said they were the same size.

I doubt the 376mm pads would even fit in the 326mm calipers anyways

 

I can confirm that the pad contact is a perfect match with the machined surface on the 376mm rear rotors. The 326mm rotor is a very recent addition to the Wortec lineup. It is possible that the rotor design bypassed the same test-fit process that was employed on the 380mm and 376mm rotors. I would be surprised if Wortec doesn’t make this right.

 

It is approximately 51 mm or 2" on my car with 326 mm rear rotors. Looks like that is what you have too but in the wrong spot near the hub. However from looking at your photo above it looks like the pads are only contacting the inner part of the rotor.

Very happy to hear they are offering the 326mm rotors if they get them right.