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AP Racing Big Brake Kit...


RedRobin
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Hi Oli 169144-ok.gif.

The AP brakes aren't noisey at all. Was the heavily modded R32 done by Ray West? He uses Porky brake bits on his road and track GTI - I found them effective but a bit fierce if you weren't careful.

I was impressed by the OEM Mk5 .:R brakes too - a better response feel than the GTI's pedal.

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RS32 - Are you still going for the RS4 brakes?

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They're certainly sourced from something that has RS in front of the number sekret.gif but they won't be saying 'RS' on them - that would look dung.gif imo.

I can't spill the beans fully as some custom prep is underway that hasn't been tried before - so will report back when things are confirmed 169144-ok.gif

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Oli, how's it going mate?

I see you you opted for the R32 and I can see why! 169144-ok.gif Are you going to have it breathed upon or keep it standard, apart from the exhaust of course?

Si.

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Hello Mr. Burt, Im good thanks.

Exhaust should be on tomorrow, and then Ill see, maybe a re-map, I have spoken to Adam and Jo @ AMD a couple of times. To be honest I am finding it a very complete car as it is!!

beerchug.gif

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Yep, Im going to see what the exhaust as to offer first- hopefully make it more revvy - loosen it up a bit

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give it 50 miles with the new section fitted and it'll do just that Oli

.. and don't forget it will be LOUD for the first 500-1000 miles, they take a while to wear in 169144-ok.gif

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Cheers Richard

I am lucky in the fact that the one I have brought is S/H, just over a month old and havng already covered 1000 miles. I gt it off someone on here who brought an RS4!!

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guessing that was the RS4 I saw last weekend then smile.gifsekret.gif

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No it was someone who put it up for sale in the general merket place - bargain

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Robin - quick question for you.

does the new setup give you a gradual take-up with very light pedal pressure, then progressively more feel and bite as you stomp on the anchors ?

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....Such things are always difficult to describe. I'll let you drive it next time we meet. Meanwhile, I would say yes - Very short gradual take-up, such that it doesn't feel like play or lack of response but 'softens' the impact. The whole feel is progressive but very smooth. But you feel the car shaving off oodles of speed very quickly but not through any increase in pedal resistance. My ARBs and suspension kill all nose dive and she stays very flatly planted.

I've noticed that my passengers aren't so strongly thrown forward on braking. Perhaps the new brakes suit me better. When braking hard I can almost feel the calipers gripping the disc but it's all very comfortable and confidence inspiring. I remember being impressed by the Mk5 .:R brakes but these APs have a more direct contact feel without being snatchy.

I hope my description makes some sense.

Although I've done nearly 3,000 miles on them (in about 10 days!), it's still early days in my getting to know their limits. Sometimes other road users get in the way of more extensive testing. They do transform the GTI imo but I'm convinced that it's the combination of brakes and suspension.

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Red, I see that you have braided steel hoses at the front.

did they replace your rear brake hoses as well?

just looking at a posting by SiBurt and he seems to have the 6 pot calipers. perhaps when you see him next you can give us an idea if that setup feels "better" than yours.

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No, we left the rear hoses as OEM. Pete at AP didn't seem to think they were worth changing but I intend to ask him again.

Si has 6-pot - I think mostly because he does track days and just fancied it. I have 4-pot and was told that for the GTI, not being a heavy car, they were adequate. I certainly have no complaints so far! Quite the contrary! notworthy.gif

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I was just looking at Dan32 new brakes on his R32 in the R32 forum and noted that the groove orientation of his discs rotate the exact opposite way yours does.

I wonder if there is a solid explaination for this or if it's just the way the fitter chooses to mount the disc.

any chance you could ask the techs at AP about this?

997669-fronts.jpg

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....Sure, no problem for me to ask. I'm in the recording studio most of tomorrow but I'll fire off an email to Pete (Senior Engineer, so he will know).

Meanwhile I have looked at the fully exploded working drawings I've got of the AP brake kit for the Mk5 (I can't publish them because they are marked confidential), and the fitting on both mine and SiBurt's Mk5 GTI is absolutely correct.

I'm sure there will be definite reasons for their design - AP do a lot of development and testing.

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Red, I see that you have braided steel hoses at the front.

did they replace your rear brake hoses as well?

just looking at a posting by SiBurt and he seems to have the 6 pot calipers. perhaps when you see him next you can give us an idea if that setup feels "better" than yours.

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Hi Petsy.

Robin is absolutely correct in as much as I have done my fair share of trackdays and this did influence my decision to go with the 6 pots. I have fitted them to my last 3 cars and can honestly say that I have not had a single problem!

I found the OE setup to have too much initial travel and then feel generally spongy. The AP's, whether 6 or 4 pot, give a nice solid pedal, exremely strong, progressive braking (brilliant if you heel and toe or left foot brake) and are totally fade free! In my opinion, they are a very sensible first modification especially as they fit beneath the standard 17" wheels. 169144-ok.gif

Si.

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Got these answers to some of the questions:

"The Braided Hose from Goodridge are as competition types i.e. Nylon wrapped in Stainless.

I can't give you any detail on carbon lined hoses?

A major point to make though on hoses is: -

Competition hose specification use screw type adaptors to allow race teams

to make up specific hose lengths. These are not legal on road applications,

therefore the road spec Goodridge supply APR use crimped on permanent

fittings that carry the German TUV certification and are road legal.

With regards to the disc groove orientation questions: -

The disc used in the Golf V installation is a Ø330x28mm with 48 curved

cooling vanes & 8 grooves per brake face. This particular disc has been used

for the last 12 years on road applications to good effect on road & track.

It was originally supplied into USA Indy car series built by Lola, driven by

Andretti & Mansell etc.

The straight grooves of this design point forwards but more importantly the

cooling Vanes point backwards. The main reason for face grooves used with

the modern pad compounds is to improve initial bite & clean pad faces. De

gassing is not so much an issue, unlike it was with the old asbestos based

compounds. This straight groove design works well so why change it!

The Subaru / APR photo shows a more up to date take on grooves i.e. curved

design and pointing backwards, this is purely to help eject pad dust. The

down side being that they can be noisier than the straight design, depending

on the installation. Apart from the noise issue a driver would find it

impossible to detect any other differences in these groove patterns.

Bottom line being both installations have the discs mounted correctly."

I hope this helps clarify things, guys 169144-ok.gif.

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