GolfGTIforum.co.uk
Model specific boards => Golf mk3 => Topic started by: DaveHDi on 02 May 2012, 18:21
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I know this might not be possible from this pic but the front calipers on my new GTi are almost touching the inside of the standard wheels. Just wondered if this is normal or do they look like they've been upgraded
(http://i227.photobucket.com/albums/dd202/DaveGT/155c5380.jpg)
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Standard 288
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Normal. Its surprising how tighter fit the standard brakes are to 15s
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Lovely. Thanks guys
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just remember not to have any stick on wheel weights fitted on the inside when you have new tyres.
I found out the hard way !. :smiley:
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Yep standard 288's, just for info drilled discs are not the best idea they tend to crack around the holes
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they kill your pads too
plain discs all the way
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I'll bare that in mind. Cheers mate
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they kill your pads too
plain discs all the way
That's the point though, its't it?
Personally I wouldn't run drilled because they crack (and it doesn't matter if the discs have cast in strong points round the discs...they still crack...911 turbo discs still crack round the holes) but grooved only offer a tangible benefit on brakes that are used hard, especially with more track biased pads.
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the point to drilled discs ?
no i wouldn't say they were their to kill your pads prematurely (if this is what you mean?)
They are their to supposedly help heat dissipation.... or thats what i believe
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the point to drilled discs ?
no i wouldn't say they were their to kill your pads prematurely (if this is what you mean?)
They are their to supposedly help heat dissipation.... or thats what i believe
Drilling, or grooving is not there to air cooling, as many think...the cooling is done via the internal vanes.
Nor is it to aid heat dissipation...in actual fact, drilling probablt REDUCES the ability to sink heat as there is less metal.
Drilling, or grooving, provides a gas path to exit from under the pad surface when the pad gets hot.
This helps stop glazing and allows the full face of the pad to contact the disc.
Sadly, many manufacturers fit drilled discs as the look 'pretty' where from a longevity perspective, grooving does the same job but without introducing so many failure points.
Ideally, a grooved disc that doesn't go all the way to the edge of the disc is best, as it doesn't provide a stress crack point...in saying that, I've never cracked a grooved disc, but I have every set of drilled discs I've ever used.
It's doubtful that you see the benefits on standard pad compounds..but go harder, and further up the heat range...and you notice the gains, as the expense of some additional noise.
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Low speed brake squeal FTW!
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Informative stuff as always Glen. :smiley:
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drilled holes do fack all for de glazing.. thats what grooves are supposedly for
all bollox IMO, plain disc and decent pads ftw
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drilled holes do fack all for de glazing.. thats what grooves are supposedly for
all bollox IMO, plain disc and decent pads ftw
As explained above...the drilled holes let the gas layer escape, which prevents the temperature going even higher, and stops the glazing occuring.
Same with the grooves.
Different solutions to the same problem.
Opinions are sometimes wrong. Yours is.
The holes/grooves are there for a purpose, and to solve a problem. Not bollox at all...simple physics.
But if you are happy with plain discs, great news.
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i think its the opinion of most people who track cars too :undecided:
although I'm no expert, id rather spend the money on high quality pads over fancy looking discs, again just my opinion, wrong or right :smiley:
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i think its the opinion of most people who track cars too :undecided:
although I'm no expert, id rather spend the money on high quality pads over fancy looking discs, again just my opinion, wrong or right :smiley:
The trouble is, the better pads will operate at higher temperatures - where you will likely experience that same gas layer.
So you tend to notice even better gains with trackday/fast road/aggressive pads when you give the gas a way out.
That being said, if you aren't suffering with braking issues...then no need to fix a problem that doesn't exist.