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TRACKDAY BRAKE CONTAMINATION

fireblade

fireblade

PCGB Member
Member
Hi

I have just returned from a trackday and found several holes in the front discs full of a solid substance presumably composed of rubber and brake dust! I have tried a low pressure hose plus a small bradawl but cannot remove it.

Does any one have any tips on removing this and does it affect brake performance.

Thanks

(Never happened on my 996 C4S!!!)
 
Been a while since mine clogged up..
I used the pressure washer to remove it.. (i'm sure someone will point out your not supposed to) [;)]
my 996TT used to do it more than this one....:rolleyes: [sm=spanner1.gif]

garyw
 
Mine used to get clogged up when I ran with the standard set-up. I found there was a tendancy for the front brakes to overheat a little as well when used on track. The holes can be cleared with an appropiate sized drill bit, but be careful not to snap it off when passing across the vented centre section of the disc. I have now changed to GT3/Turbo 6 pots and 350mm discs with Pagid yellow (I think?) pads, which is much better with no clogging as yet.[:)]
 
Thanks but I tried various bits of wire up to mains copper then a bradawl which I hit (lightly!) with a soft faced mallett. The gunge seems to have solidified into concrete!!

I was hoping that a specialised wheel cleaner might work but in the Porsche one I have has been useless.
 
Thanks, using a drill was my next thought, but as usual the battery was flat! Being a Turbo I already have six pot calipers but I will investigate the brake pads as I don't really want to have this problem after every track day.
 
you need to use a small drill bit, i can't rember the exact size, something like 5mm - you should be able to clear them turning the drill bit in your hand. only in extremis should you resort to using any cordless drill to help you. Its a bit time consuming i'm afraid but it works !
 
Thanks again for the tip.

Although I am slightly hacked off to have to do this, I am pleased that this is a common problem and I haven't broken anything on the Turbo's first track day!
 
Still can't clear the holes, will have to wait till I get the wheels off and can apply serious manual force. I need something to hold the drill bit with as well so far burnt holes in my hand!
 
Thanks, I had rather given up on this at the moment, the gunge is now as hard as concrete! Track day coming up in August so will attempt removal then while discs are stil hot and hopefully the holes will have expanded a little and the gunge can be punched out.
 
I recently had an entertaining day on a medium sized track [:D]
My discs have come away blocked too.. I'll get the pressure washer out and confirm if it worked OK again or not !!

garyw
 
I use a drill bit and do it by hand (you get your hands filthy). If you use a drill you'll find yourself hitting things like the backplate. If you use a washer you'll probably not get to the holes at the rear of the disc, i.e. at the other side of the vent.
 
Thanks, I am reluctant to use a pressure washer and a power drill. I did try with a drill bit in my hand but I couldn't get through it as it seemed like concrete! I also bruised my knuckles and palm. I will have a go when the discs are hot at a trackday wearing gloves!
 
Using a drill bit by hand works fine. If you can get one of those bits which has a hexagonal fiting on one end which fits in a screw driver, it makes the whole job far eaier.
 
OPCs use a drill in my experience. You might try a Pin Punch - much less brittle than a drill bit and can be gripped by hand - this has worked for me but I don't recall anything as a hard as concrete so this may not be enough.

Access is much easier with the wheels off. I recommend using two wheel "assembly" bolts (available from OPC - not expensive) - the wheels slide off over them so you don't crash the wheel around the disc or caliper - essential for protecting ceramic brakes and in my view just as useful for steels. (There's mention of them in the driver's manual in the section on removing the wheel but unfortunately they are not supplied with the vehicle).
 
Thanks, I intend to treat this as a wheels off operation but just want to get a method that will work before I go to the hassle.

I also purchased two (not just the one recommended) screw in wheel assembly guides and I feel that two are absolutely essential as I struggled with only one when I changed a wheel on my 996 4S (supplied with the car as was a jack) I find it apalling that you have to buy these as extras and also a jack which I cannot fit in anywhere convenient, the so called tool kit is a joke too!
 
ORIGINAL: fireblade
but I will investigate the brake pads as I don't really want to have this problem after every track day.
Click to expand...

Doesn't matter what pads you use, the holes need clearing after every track day if you want to get best use from the discs.
 
I used/use a plastic headed nail as used in fitting facias and soffits etc. the nail has grippers and made easy work of the blockage without much fuss, they fitted exactly the right size for a 986S disk hole
 
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