Golf MKIV brakes on a Polo

**Sharkie** · 18-09-2008, 04:08 PM

Sorry, should have said 288mm required for the Polo. Some Mk4 GTI's had 288mm and some had 280mm.

The 312mm upgrade is the one to go for, but requires new calipers and carriers.

**jasn78** · 18-09-2008, 04:16 PM

tis all cool johan just had the chance to test fit some so thought i would let everyone know what the deal is

**DubSteve** · 18-09-2008, 04:24 PM

Originally Posted by Sharkie

Sorry, should have said 288mm required for the Polo. Some Mk4 GTI's had 288mm and some had 280mm.

The 312mm upgrade is the one to go for, but requires new calipers and carriers.

Also I think you need to run 17s at least to clear the calipers don't you? For the r32 conversion anyway.

**Timbo** · 18-09-2008, 04:35 PM

I think these are the part numbers you'll need (excluding the 312mm rotor, which can be had from DBA and others)

Audi S3/TT brake calipers:
8N0 615 423 C (LH caliper)
8N0 615 424 C (RH caliper)
Audi Caliper Carrier 8N0 615 425 (x2)
The Audi part number of the 312mm rotor is 8L0 615 301 (again, x2)

The stock wheel will still clear these (well, if they have the same offset as mine, which was an April 06 build...why did they change that, Tim wonders?)

I thought this was already in FAQ & DIY sticky, but couldn't find it

Addendum: the critical piece of kit is the caliper carrier, which is -- AFAIK -- an Audi part. The calipers from the Mk IV GTI (with larger rotors) will work, and there's a VW part number (if I knew...). These calipers were also used on a turbo version of the new Beetle

**Eddy** · 18-09-2008, 06:34 PM

Originally Posted by Timbo

I think these are the part numbers you'll need (excluding the 312mm rotor, which can be had from DBA and others)

Audi S3/TT brake calipers:
8N0 615 423 C (LH caliper)
8N0 615 424 C (RH caliper)
Audi Caliper Carrier 8N0 615 425 (x2)
The Audi part number of the 312mm rotor is 8L0 615 301 (again, x2)

The stock wheel will still clear these (well, if they have the same offset as mine, which was an April 06 build...why did they change that, Tim wonders?)

I thought this was already in FAQ & DIY sticky, but couldn't find it

Hoyhoy.
Timbo I was wondering how many pistons in the S3 calipers & are they that much better than stock.
Or would it be better to go 312 with Brembo calipers.

**Timbo** · 18-09-2008, 06:59 PM

Originally Posted by Eddy

Hoyhoy.
Timbo I was wondering how many pistons in the S3 calipers & are they that much better than stock.
Or would it be better to go 312 with Brembo calipers.

Single piston, Eddy. As to "that much", it depends on usage: if you're going to do any track work, then much better, but you probably wouldn't notice it too much over stock size, one you've fitted decent pads & fluid.

As to the Brembos on 312s, I'd suggest checking with Guy, as I'm sure that will put you into 17" wheels and -- as jamesatfysh has discovered -- not just any old 17" but either the default option TT/S3 wheel...or something more ...exotic

**Eddy** · 18-09-2008, 07:29 PM

Originally Posted by Timbo

Single piston, Eddy. As to "that much", it depends on usage: if you're going to do any track work, then much better, but you probably wouldn't notice it too much over stock size, one you've fitted decent pads & fluid.

As to the Brembos on 312s, I'd suggest checking with Guy, as I'm sure that will put you into 17" wheels and -- as jamesatfysh has discovered -- not just any old 17" but either the default option TT/S3 wheel...or something more ...exotic

Hoyhoy.
The thing is that Guy's (APR) are 328's, so I was thinking of a multi piston caliper on 312's could fit under 16's. thats all.

**Timbo** · 18-09-2008, 08:24 PM

Originally Posted by Eddy

Hoyhoy.
The thing is that Guy's (APR) are 328's, so I was thinking of a multi piston caliper on 312's could fit under 16's. thats all.

With the Brembos, it's not the diameter, it's the extent to which they stick out relative to the stock or upgrade VAG part above. I'm not saying they'll be a problem on 312s, but you'd need to check carefully