8E0 Rear Brake Upgrade

[twoqu]

Paul,

My concern was for your wallet!
But if you are going to buy the whole set up on the hope that it is going to fit, good luck to you! Obviously there will be no compatability problems.
Those pads are completely different. It looks as though they slide in a channel approx in the middle of the pads whilst normal ones slide on a ledge at the rear. I guess it also means that they are going to be more expensive!
Still it looks like if you were fortunate enough to find any of those models in a brakers, you could use the calipers!
The point I'm making is that although the discs might make suitable candidates, it doesen't look like you can pirate bits from another model or use affordable secondhand components.
Still someone has to have a go

[S2central.net]

@Twoqu again - just read your post again... assume your concerns about this are with using a hybrid of the 8E0 discs and carriers and UrS4/S6 calipers if that means using incompatible pads. Fair point worth some thought...

We can woffle about this for weeks but until all the parts are in my hands I have no real evidence.... Ehhhh except the discs which are going to fit lovely.


Paul

[S2central.net]

@Twoqu - not sure I understand the concern about tabs on the pads. It doesn't look that different a pad shape than stock S2 rears...

If the 8E0 carrier wraps around the 8E0 disc and uses the 8E0 calipers and 8E0 pads then all will be grand and compatible. It will be a massive fluke if it turns out that easy. I'm preparing myself for custom made carriers !

@Stick - I'm not anti Ford parts really. Hey I drove a Mustang for three years... Surely that says something. I rather doubt that the Ford Scorpio 300mm vented disc will fit the S2... and its even more unlikely the Ford carrier will be useful but for sure they may have used different varieties of rear Girling calipers that could have uses. Don't forget all my intentions here are for the Coupe, but the Avant has a different rear caliper 'cos the handbrake mechanism is different - some abnormal sources of calipers could be useful for the Avant folk.

Anybody know if a Girling catalog is available - on line or in print ?

Paul

[rotoryboy]

[Stick Insect]

Paul,

I know I mentioned this before but Ford Scorpio calipers are thge same as the Audi calipers on the non vented ( early and late scorpio) but the middle period ones were vented and ths scorpio Cosworth Estate had 300mm + vented disks on the rear ( bigger than the fronts) HTH but I know you hate the thought of ford bits on your car!....

David

[twoqu]

Right!
Bit of lateral thinking! Managed to get a cross reference of the pads. Typed that into Google and got this back.
http://www.webparts.co.uk/Brakeworld...TML/BW4062.HTM
If someone has the skills to repost the pad pic, that would be useful!

[twoqu]

Paul,

The problem is that you are going to have to mock up with at least the carriers and pads. Even if the carriers bolt up and clear the disc radially, you will not be able to tell where the friction material sits. Clearly this is a new generation of calipers/pads rather than the Girling 43 and alloy Lucas ones. Accepting your reservations about illustrations it looks as though these pads have tabs that locate them on the sides.
I'll see if I can PM you the link so that you can have a squizz. Unless Ben has some he can take a pic of!

[Ross]

Whoa - just looked at this. Am I getting lost and excited in the brake disc jargon, or is this a rear brake conversion that can be fitted with relative ease? Please god, let it work

[S2central.net]

I've only seen reference to the electromechanical handbrake mechanism on the neu RS4 - I don't think it applies to these S4/S4 Cabrio rears.

I did look at the family album for pictures, but they are so vague and generic that its impossible to learn anything new.

To be honest, as the discs are such a good fit - I'd be fairly confident about getting custom carriers made to suit the S2 rear dimensions with UrS4/S6 or A8/S8 calipers.

The 8E0 calipers are on back order - I won't see them for a couple of weeks. When I get the carriers - I'll go for a dry fit to test the land !


Paul

[twoqu]

Paul,

Its difficult to tell but clearly they are not conventional carriers. In particular that spar that braces the caliper looks similar to calipers fitted on the front of some other models!
As you have said the spacing looks wider and so does where the pads locate. Rather than the usual ledges the pads slide on it looks as though they have channels.
I'm wondering if this model used another caliper/pad combo, perhaps these new fangled electromechanical ones?

Just looked at that Russian site. Its does show an illustration of the carriers you have but the exploded diagram show a conventional carrier The pads do not seem to have the usual butterfly clips on the back. They are listing retaining clips for the pads which suports the different carriers/pads/caliper hypothesis!

[90quattrocoupe]

Interesting pictures Paul.

From the looks of it, the carrier is designed to be bolted to the outboard side of the hub carrier. It only has machining on one side. Bolts up just the way you have to do the S8 carrier to get it to work with the UrS4/6 caliper on the 280 rotor.

You could take a look at Ekta, and it should show you whether or not the Ebrake is center or front pull. Most of the newer Audis use a front pull. Makes it difficult to use those on a Coupe. May be easier to just turn down the rotor to 280mm.

Well keep us informed. Thanks for doing the legwork.

Greg W.

[S2central.net]

Here's some photos that I have from Ben so far - the carriers are in the post !!!


Picture 1

Picture 2

Picture 3

Don't they have a nice familiar look about them - I think they will bolt to the hub alright, but dunno yet if they will line up with the disc of course - details details !

Paul

[S2central.net]

The 8E0 300x22 rotor will fit straight on - I have them on the bench. The hat height is actually lower than stock rears i.e the 8E0 rotor sits about 6mm further OUTboard.

Going by approximate measurements of the 8E0 carriers (they were on Ben's bench)... and I'll post on some photos which look very positive.

The spacing for carrier to hub is correct at ~90mm, but the spacing for the caliper bolts is too large at ~145mm to accomodate the UrS6/A8 calipers (on ~120mm from memory).

This means that 8E0 rear calipers may be needed - lord knows if the handbrake mechanism is in the right place.

Alternate schemes could cook some sort of modified 8E0 carrier with the right bolt spacing for non 8E0 calipers. Too early to say anymore about that yet !

I'll have the 8E0 carriers in my hands at the weekend and will have to bite the bullet on 8E0 rear calipers just to complete the investigation process properly.

Watch this space !

Paul

PS - If anyone knows of a 2004 or later S4 or S4 cabrio lying around - can you sneak a photograph of the rear brakes and handbrake mechanism ?

[90quattrocoupe]

Anyone have an update on this yet?

Whether the S4 300X22 rear rotor system will work on the coupe?
Will the S4 carrier with the UrS4/6 caliper work with the 300X22 rotor?
300X22 S4 rotor, turned down to 280X22 to work with the S8 Carrier and UrS4/6 caliper? Spacing need on this?

Greg W.

[s2avant]

I'll do some measurements and try to get a picture.

The caliper carriers are on back order though so I can't guarantee I can get them before the garage meet.

Give me a call or drop a PM and we can sort out what bits you want to try out.

Guess I'll have to pull my finger out and wear out all my brakes so I can go one better. 300mm rears makes my 256x22mm setup seem puny.

Do you think I can 324x22 or 335x22 or even 356x28 on the back of my Avant?

Need something good to go with the 8pot 365x34 front setup I've got planned :mischeif:

Ben