Noisy Wilwoods
 

I have a RR Racing Sport BBK. They are the Wilwood Superlite 4 piston front and matching 2 piston rears. Functionally they are great. But after they get a little heat into them they squeal like hell. Even with street rated pads they do it. At the track its getting almost embarrassing. I have tried the Wilwood BP10 and 20 pads, two different Porterfields, and a set of Hawks. All do the same to varying degrees. I have tried with and w/o shim plates. Wilwood doesnt show any sort of spring clips like a stock caliper would use but i wonder if I'm missing something, they cant all be like this. Any suggestions?

How are you bedding your pads?

only two set of pads were new, the others came with the kit which was used. I always try to follow the pad manufactures bedding instructions. The rotors were in excellent condition and are not showing any sign of odd wear.
I do swap pads between evens (Autox/track) so maybe that does it? but I imagine that pretty common.

Noisy pads are a sign of a racecar

wear that badge with honor


also if you are swapping pads you should rebed them everytime

The pads will trasfer material to the discs, so, whilst replacing the track pads, which are typically noisy, there will still be that material on the dics when you swap out to street pads.

https://youtu.be/v2Oz3QgDE6o

When I use to play "race car driver" I would sand the discs with some wet and dry then clean everything with brake clean prior to swapping between different pads.

My old QFM 1ARM (good local pad for sprints) would squeal like crazy, if I just swapped out to QFM HPX they would still squeal, but if I sanded everything they didn't.

I also like to sand and clean pads.

As for bedding in, I bed in both street and track pads the same.

https://youtu.be/pdPX6rzuINc

I'd try cleaning the rotors with something between pad changes to see if it helps. The pad material likely just has a loud noise profile and can only be lessened, not mitigated.
It really isn't anything to be embarrassed about anyway; anyone on the track who thinks negatively of your brake noise probably understands the function, but hates the actual sound.

Much like how air chisels are very loud, but are a necessary evil sometimes to get the job done right.

Humor us and walk us through the steps you did as you recall them.

I think in the main thread for these brakes some one says “if you want to use this kit without squealing, good luck”

I've got the stage 2 RR kit (Wilwood 6r superlite caliper). I've tried two pads on them. BP20 pads only squeal when cold, which is great for track use since brakes are never cold on track. Polymatrix Q pads (with shims and grease) only squeal when hot, which is fine for non-aggressive street use.

It's not a perfect solution, but good enough for me.

Thanks for all the great reply's. So I'm thinking it's partly a side effect of the bbk itself, and partly my swapping different pads on the same rotors. Maybe I didnt bed them properly, or at all, between the pad changes.
So what about using a flex hone to scrub the rotor surface clean and then bedding a new pad set? see what happens.

Ha. Yeah that probably the guy I bought the kit from.

If you have enough pad wear to use pad spacers, give them a shot. I install these whenever I install my endless cc43.

https://www.summitracing.com/parts/WEH-WM196125

I had train brakes that you could hear from from blocks away with the endless pads. With the spacers they are almost as quiet as cold street pads.

Same issues here with same kit. Going to add shims and grease soon to see if I can reduce it. Using BP20 front and rear.

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Glad to know it seems to be common. What do you have in mind for grease?

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