rotor shudder issues

[ryneen]

I always properly bed my pad/rotors before going to the track.

I’ve been having rotor shudder issues for awhile. They only shudder when they get really hot, not when they are cold. Everyone who's smarter than I has said that my rotors are not warped, it's just pad deposits. Therefore, I’ve switched to more aggressive pad compounds in hopes of fixing it (currently Carbotech XP 10), but the shudder still persists. I'll be switching to more aggressive PFC 01 pads next time out.

I may have found the problem. I just noticed that I had a good deal of rubber jammed into many of the rotor vanes. Please take a look at the attached photo of what I pulled out. Could this be causing hot spots where only the rubber areas get extra hot and smear pad material to the rotor??? How can I avoid getting this much rubber in the vanes?

Thanks in advance,
Ryan



 

[TURBO2GO]

I always properly bed my pad/rotors before going to the track.

I’ve been having rotor shudder issues for awhile. They only shudder when they get really hot, not when they are cold. Everyone who's smarter than I has said that my rotors are not warped, it's just pad deposits. Therefore, I’ve switched to more aggressive pad compounds in hopes of fixing it (currently Carbotech XP 10), but the shudder still persists. I'll be switching to more aggressive PFC 01 pads next time out.

I may have found the problem. I just noticed that I had a good deal of rubber jammed into many of the rotor vanes. Please take a look at the attached photo of what I pulled out. Could this be causing hot spots where only the rubber areas get extra hot and smear pad material to the rotor??? How can I avoid getting this much rubber in the vanes?

Thanks in advance,
Ryan



How is that rubber getting in there?! I never bother to check inside the vanes.

 

[docjohn]

I can empathize.I have had the same issue and sometimes just braking harder for shorter periods helped.One thing to point out though.with the front brakes doing the nasty the steering wheel vibrates,when the rear brakes are the issue the steering wheel feels fine ..but the whole car feels like its vibrating.My front issue was usualy pad deposits occasionaly a real warp.The rears were often a sign that my rear calipers needed to be relubed or refreshed because the pads were binding ie not releasing fully and iether causing pad deposits or warping rotors.

 

[NSXDreamer2]

That's right, before I religiously "lube" the caliper pins, I always had the shudder problem too... I haven't had experienced any brake shuddering, and maybe I learned to brake less (easier on brakes and trying to carry more speed in corner) at my home track.

But this year, I've been in different tracks that needs more braking than my home track and the brakes still work fine.

 

[TURBO2GO]

I used to have slight shudder, but XP10's cured the problem. Whatever residue was on there, they cleaned up pretty well.

 

[ChopsJazz]

My shudder problems were cured when I used the same braking technique described by docjohn above, and by using slotted rotors.

 

[ryneen]

I don't think my problem is my driving style. I drive moderately quick and I'm on the brakes as little as needed. The shudder was present even when Billy Johnson drove my car for many laps at Buttonwillow.

I never heard of lubing the caliper pins. I'll check into this.

 

[robfenn]

The discs are made from choclate, super hard pads will iron out the warping for a while but it is unavoidable. Upgraded discs is the answer...

 

[PhiAlpha44]

I've got some brake judder. I had my calipers mic'd and they're not warped. It really feels like they are... but in the end it really IS pad deposits. I just need to get around to putting some aggressive pads on the front and getting that crap scraped off, then put my regular pads back on.

 

[PhiAlpha44]

The discs are made from choclate, super hard pads will iron out the warping for a while but it is unavoidable. Upgraded discs is the answer...

I'm no track rat.... but I don't agree with this. I've got a buddy that tracks his car on the stock brake system w/ upgraded pads. He tracks hard and often, and he's never had a problem... if those discs were going to warp, he would've done it by now.

 

[FXMDBilly]

I don't think my problem is my driving style. I drive moderately quick and I'm on the brakes as little as needed. The shudder was present even when Billy Johnson drove my car for many laps at Buttonwillow.

I never heard of lubing the caliper pins. I'll check into this.

What pads were you running again?

Remember we had the EXACT same problem with our 72-vane 13" Brembo Motorsports Rotors (much higher quality and balanced compared to the off the shelf street rotors) in the FXMD Unlimited Car - until we put the more agressive Performance Friction 01 compound pads on it.

It's not your driving style, you are using the brakes agressively (like you should), and you don't have the stock 'sliding' caliper, you have a 4-piston Brembo "Lotus" caliper -so there are no pins to lubricate in the first place. It's uneven pad deposits.


Billy

 

[ryneen]

Billy,
Thanks for the info. I'll be switching to PFC 01's for my next outing.
Ryan