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brake judder

dparslow

dparslow

New member
Discs and pads would be a good starting point if they are showing signs of wear. Mine are just starting to give a little tremor at 60-70mph, it has been about 25k since they were last replaced and the pads are just over half worn. I find the standard brakes on 993 C2 more than you ever need in road driving. Big reds on the 993tt are really awesome though!

Dave

993tt
993C2
 
My brakes were getting more and more juddery as the year progressed and so I mentioned this at it's recent 12,000 mile service. The Porsche Specialist (Jaz) discovered that all discs and pads were worn plus one of the rear discs was cracked. I had them change all discs and pads as they only had another 500 miles left on them anyway. This came to about £700.

I've not considered ugrading to reds as I've found the blacks sufficient, but I'm sure they'd make a difference. Though I suspect better braking power would only encourage me to drive faster!

Nick
 
Alan
My brakes started to judder recently and I had them refaced at £180. Also fitted new pads, sensors and dampers ( they are big reds). Turns out the trouble was my not driving the beast often enough, and disc corrosion from sojourn in a non-dehumidified garage. After the work I had smooth, awesome braking. At the previous service, my garage (an independent) drilled out my clogged cooling holes.
Might be cheaper than replacing the lot.
JohnC
993 turbo
 
If the discs are not that heavily worn (measure them with a micrometer) then I would suggest having them re-faced rather than fitting new ones. They have probably become slightly wrapped, but more common is that fact that standard pads are not really up to particularly heavy use and I noticed that you said you didn't do any track use, but even still, a few blasts between speed cameras can have the discs glowing!! Pagid do some very good pads which also give a much better bite rather than the "slightly numb" feel you can get with standard pads. Visit www.performancebraking.com - they are very knowledgable and extremely friendly. They are very easy to change yourself, if you have never changed pads in anything before I'm sure someone will show you / explain. I would definitely clean out the holes with a drill because a front disc actually has vanes machined inside them which actually "pump" air in throught the holes and out of the centre. If the holes are clogged up, then the air cannot cool the disc as effectively. If you do have the discs re-faced, use a good engineer to do them - they must be mounted in a mandrel and both sides skimmed at the same time without re mounting the dics in the lathe again, otherwise they will not be absolutely true. - this is very important. Bigger brakes will not help you stop any quicker, as it is your tyres that connect you to the road, but they may give you more control and feel. I personally wouldn't think that they are worth fitting unless you were going to do some serious track work.

Best of luck
Simon
 
Before you go spending loads of dosh, just clean the holes out and if you do whip the pads out, give their surface a wipe over with wet and dry, then bed the breaks in again (light brake say 80 - 50, cool, repeat a couple of times then heavy brake, say 100 - 40 then cool).

With the holes blocked and driving a bit hard you have probably glazed them......
 
Of course - I would only recommend a very small amount of material removal from the surface until the disc runs true. If you have cracks running between holes, then bin them and have new. Don't forget that Porsche will set tight specs for wear on discs for 2 reasons. 1. Health and safety - they will include a large safety factor to cover their arses. 2. (I think this is the main one) They get to sell and fit more discs to cars!!

I think it would be fine to skim a set of dics once, after that - think I would go for a new set.

Just as a point of interest, I used to race a modified 205 and skimmed the disc about 4 times (obviously a tiny amount in each case) never had a problem at all, and they used to glow red hot most of the time!!!
 
hi can anyone help me please?

on motorway driving there is a severe judder when im braking which goes when the speed drops below 40mph. ive had new original discs and pads all round and no change (sore point)! any help/advice much appreciated

adam '96 993 carrera2 varioram model
 
I put up with this for some time following purchasing my 993. Cleared out the vent holes in discs - no difference, balanced wheels twice - no difference, checked run out on discs - all ok and got thoroughly fed up.

As a last resort changed the front tyres for Conti Sport N1's (they were Toyo's) and judder was instantly cured and has never returned. !!
 
If it feels like an 'ABS pulsing' it could be the ABS Sensor on one of your wheels.
This happened to mine when i first test drove it. Front drivers side ABS Sensor was replaced by the seller and has been fine ever since. Not sure if that's your problem but maybe worth checking.
 
And not to forget the dodgy batch of discs which warped badly - mine were exchanged and no questions asked - there may still be some out there on shelves
 
Would agree with all above comments.

Poorly-seated disc? Hubs need a good rub down/clean & plenty of Coppaslip before fitting the new ones. Ask your mechanic?
 
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