Big Rear Brake Options

Sam_

Sam_

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Yes, I'm doing it for looks... It annoys me having huge brakes up front and piddly rear discs. VAG obviously sorted it out on later models and fitted 310mm discs! I need new discs and pads anyway so thought while I was there I'd make some improvements.

I looked into the 4 pot + electric handbrake caliper option but the adapters alone are $500 so not sure it's an option since I'd need to get the cayenne 4 pots($500 ish), handbrake calipers (£250-300) and some S3 discs. If it wasn't so pricey, I'd have done it but it seems like a waste of cash.

Then I found these adapters which use an OEM disc untouched (280x22mm (VW Golf 4 Audi A3 1.8 TDI 1.9) part no: 1JO 615 301 E):
https://www.bolt-action.nl/product/vw-mk4-280mm-rear-brake-adapter-kit-r32-s3/

This is not a massive size increase over OEM of course but would be a nice cheap upgrade. ECS do their 304(?)mm kit but it requires grinding to fit which doesn't sound great.

There was also a guy doing a 300mm kit but it required redrilling discs which would just be agro and asking for trouble. Anyone know of any other options?

P.S. Also noticed those guys make adapters to fit TTRS calipers to a Mk4 which would be a nice option with Mk4 R32 discs:
https://www.bolt-action.nl/product/...polo-9n-334mm-ttrs-brake-caliper-adapter-kit/
 
I quite like that kit Sam. Not seen that before!

Using OE vag front discs like that ok the back appeals to me.

May well be a consideration for me at some point :)
 
Paul in here was knocking out adapter kits to run S4 discs, but obv redrilling required, which i think he could supply. That 280mm upgrade is pretty awesome tho.
 
Just to show off

330mm will fit

Image0143.jpg


Image0141.jpg
 
ABS = no traditional bias controller

Brake 'biasing' as such done on ther fly by the ABS computer

ps iirc you've posted this info up yourself in the past - also that the system engages the rear brakes first ;)

From my own monitoring of rear heat levels, the rears do alot more work than folks assume they do
 
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If your abs fails or you dissconnect it then it makes things a bit more interesting. Ours is so light on the rear that when pushing the brakes hard enough the rear gets light then locks. Not very safe. This is with road tyres and standard a3 brakes. Manual biasing will be installed to help sort this out.
 
as in locks up now you've disconnected the ABS controller ?
 
Yeah and taken fuses out and removed all wiring for it. It's a track car after all.
 
I wonder if paul could machine down his adaptors to accommodate the 280mm discs.
 
Just found another bunch of guys doing adapters. I'd seen these guys selling parts to strengthen the 02m box but noticed they sell all sorts of brake adapters:

Kit to fit TTRS calipers and 370mm (!!) discs to a mk4:
104bremssattel-adapter-ttrs-bremscheibe-bremssattel-1_2282_600x600.jpg


http://www.epytec.de/detail/index/sArticle/4344

This one looks interesting but is for the FWD chassis. It allows a 4 pot to be fitted with a 280mm disc (same as above) but uses the OEM caliper for handbrake with the regular brake line sealed off. Nice solution:

667-1-bremssattel-adapter-golf-vento-bora-4-1_2020_600x600.jpg


http://www.epytec.de/kategorien/bre...porsche-bremse-bremssattel-hinterachse?c=1248

A shame it's for the FWD chassis. I've emailed to ask if they do it for the AWD chassis. I'd imagine there would be more demand there?
 
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Dani_B19 said:
I wonder if paul could machine down his adaptors to accommodate the 280mm discs.
Click to expand...

Not as simple as that sadly... have been looking into this myself along with Paul and the problem is the position of the mounting lugs on the axle... the reason most AWD rear disc kits are 300mm or larger is that the bracket allows the claiper to sit above and inline of the original mount holes... going for a smaller disc means these mount holes have to move around the circumference of the original holes which moves the caliper around altering the position for the handbrake cable and the brake line... its potentially doable but I haven't had a chance to pursue it further..

The other issue is getting the correct thickness disc... it needs to be 22mm realistically and there is a suitable disc that needs less attention than the ones currently use (22x284) but the bracket is proving to be the biggest issue

<tuffty/>
 
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Well keep us updated mate. As you say I emailed paul and he said what you just wrote. I've got his 300mm rear but fancied the 280mm setup as it'd make consumables cheaper.
 
Sam_ said:
It allows a 4 pot to be fitted with a 280mm disc (same as above) but uses the OEM caliper for handbrake with the regular brake line sealed off. Nice solution:
Click to expand...

Looks a very heavy setup

imho it would do something nasty to the handling

Sam_ said:
They also do a 310mm kit but it uses redrilled discs :(
Click to expand...

These seem a little bit pointless to me - why not just use the 312mm or 288mm disks - correct pcd and offset nearer (correct for 2WD, spacer required to fit 4x4)
 
I doubt it'd be that heavy. Those 4 pots are pretty light. Obviously more than stock though.

Some kits do use the 312mm discs I think.

The ECS kit would be nice if it didn't cost so much. They're also a bit painful when it comes to replacement rotors I think.
 
Sam you could always run a hydraulic handbrake with locking mechanism, its MOT legal and you can use whatever rear calipers you want.

handbrake1.jpg


Only reason I haven't got one is it gives me the urge to handbrake turn everytime I take a tight corner or park
 
That image is huge! I could fit something like that but it seems like a lot of effort. I've seen you can get electronic handbrake calipers which I like the idea of. I thought the whole point of the handbrake being cable driven was that it wouldn't be effected by leaks in the hydraulic system? Maybe MOT's have changed since I left?
 
Stock rear brakes are fine you mongs, go find something else to waste your money on :laugh:
 
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Sam_ said:
That image is huge! I could fit something like that but it seems like a lot of effort. I've seen you can get electronic handbrake calipers which I like the idea of. I thought the whole point of the handbrake being cable driven was that it wouldn't be effected by leaks in the hydraulic system? Maybe MOT's have changed since I left?
Click to expand...

Nope the handbrake just needs a locking mechanism to be legal. It can be cable or hydraulic.
The handbrake is just a parking brake.

Nick when you say stock rear brakes are fine........ your car doesn't have stock A3 232mm brakes does it? lol
 
Nick, read the first sentence in my first post ;) The tiny discs look stupid. Another reason to get an 8P! (300mm rears as standard ;))
 
Prawn said:
no, but everyone else in this thread has 256's on the back :)
Click to expand...

I agree.

I am more than prepared to admit I know nothing about driving. Hands up on that one so take this with a pinch of the expensive stuff.

But the little I do know, and the little experience I have with S3's tells me that I wouldn't want any more braking effort at the back than I currently have.

But what I do want is slightly more power at the front to help the car chane direction under and after braking.

If I could get on the brakes later, and use the weight transfer to help bring the back round I would feel initially uncomfortable with the shift in weight, but once I get used to that feeling of lightness and my confidence grows I think it would be a real benefit to have a similarly modulated bias to standard with the same sort of power on the front as I experienced from GT Juniors, 323's and the Mintex M1177's on my old A3 and the same braking on the rear as I currently have.

Also, what is going to happen to the feel of the brakes when you increase the piston size on the rear and with it to the heat generated from the rear brakes.

I imagine sponge will be involved somewhere.
 
<tuffty/> said:
Humm... pretty sure Bills Leon Cupra (my only TFSI point of reference tbh) has solids... must be an S3 thing... :)

<tuffty/>
Click to expand...

Similar situation to the Leon 1.8t 180, 312's at the front but solid discs at the back. Seat raiding the parts bin again.lol
 
BENJAMIN said:
Similar situation to the Leon 1.8t 180, 312's at the front but solid discs at the back. Seat raiding the parts bin again.lol
Click to expand...

Will have to look again when I am over at the unit tomorrow... I am sure they were solid discs lol... its got the big fronts though...

<tuffty/>
 
ImageUploadedByTapatalk1414480861066457

6pots under a 17 on an R32 disc.

ImageUploadedByTapatalk1414480962849039

312mm s3 standards on the rear with 4 pots pictures from an 18" wheel
 
Is that on the rear? I have 6 pots up front already but we're talking about the rear here.
 
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