Brake judder on track day

[Paul_B]

Hi everyone 

 

took the 350 on the track first time today, noticed after 2-3 laps going hard I would get awful brake judder, the car had new brembo discs and brembo pads 1 year ago. Do you think the discs are warped or just the lack of performance from them??

thanks

 

[davey_83]

Pad transfer due to overheating, can clean up. How did you fair anyways? 

Edited February 5, 2018 by davey_83

[Paul_B]

I assume that the pad transfer will wear its self off the disc, any advice on how to cool the brakes ?

 

got on really well, love Bedford as a track just very demanding on the brakes

[Ekona]

Decent pads and discs will help. Exactly what ones did you buy? Brembo discs are generally good, but I don't rate their regular pads at all. It's very important to make sure you don't sit there with your foot on the brakes in the paddock when you've just come off track though, as this is what normally causes it. Also make sure you do a proper cool down lap, which is one lap without touching the brakes at all.

 

Best way to clear a disc is either skimming them or you can try a bedding in procedure again.

[Paul_B]

I have the standard brembo discs and the standard brembo pads, I think I wasn’t letting the brakes cool down enough on the final laps, thanks for you help 

[davey_83]

They won't clean themselves up sadly. In my incident, it happen mid session so knew it wasn't to do with cool down lap or holding foot brake on in paddock. The OE spec pads after a few laps of Silverstone National, overheated and begun to deposit on the discs. 

 

A brake bedding in process is very much worth a go, as this sorted mine out. Sounds strange as excess heat essentially caused the issue and now you're using heat again to remedy.

 

Edited February 6, 2018 by davey_83

[docwra]

If you do another trackday they probably will sort themselves as they get uberhot again, if you dont then like davey says do another bed in procedure and it might just be enough   

[RobPhoboS]

Yep, it's just depositing.

Careful how you drive when coming into the pits and pulling up, they are usually still incredibly hot and this is when I guess it happens mostly.

 

We went to Spa last year in the E92 M3, after a track day at Snett, and as we were approaching the hotel the brake judder was violently shaking the car.

Predictably just before lunchtime and several laps they were fine

[Paul_B]

Thanks for your help guys, I’m off to the ring in April and haven’t booked another track day, so will try the bedding in process first, 

[tkz1]

I had extreme brake judder when I was running DBA T2 discs with standard oem brembo pads at Cadwell park. The pads weren't up to the job and left some deposits on the disc.

 

I had my warped discs skimmed by Marcus at Disc skimmers and he found the hub of the wheel was not perfectly flat which magnifies the issue. He thinks it's because I had my wheels badly refurbed.

 

Discs skimmed, hubs filed down to be flat and then replaced the pads with DS2500s.  Took it to Cadwell Park again and car was fine all day, not to mention the significant improvement in braking power.