Friday Fairytale (WARNING: contains Brake Porn)

[s2dude]

Quick question, is it possible to machine a bracket that mounts over the two lugs, so the lugs are inside the bracket?

Would it work or is it a brain fart moment?

Great work guys and luvverly brakes ...but...a
couple of potential areas to look at maybe

I think as Lee said

When you upgrade one thing you move on to the next. I don't know of anyone else that has bent an upright: I actually deformed the lugs that the caliper bolts to and had to buy new ones from VAG-PARTS..V EXPENSIVE. I did stress analysis on the brackets I designed and knew that they were the strongest part in the system. The solution now is a 4 point caliper mount instead of the more conventional 2 point: it is quite funky and should be made just after Xmas. The new bracket strengthens the whole bottom end of the strut. Just getting a prototype made now to check dimensions before making the real McCoy. Then the weakest link is the rod in the front shock but I doubt that will bend as there is very little length exposed during full compression!! Can people now understand why topmounts (blue or green) don't cut it in my car?

You may well bend the mounting lugs with those monsters when used in anger...

and one thing you mentioned was big pedal travel till teh brakes actually worked.....

This is due to the S2 master cylinder not having the oomph to push enough fluid into those biiig calipers and it takes a while for pressure buildup...

How about an RS6 Master Cylinder as the next mod

[jubjub]

Crikey; They are big Brake porn indeed

[AndyP]

Just out of curiosity, what ever happened to Lee? I thought he was going to be part of MRC, then he seemed to disappear off the face of the earth!

[S2 Ant]

Just out of curiosity, what ever happened to Lee? I thought he was going to be part of MRC, then he seemed to disappear off the face of the earth!

[Greg_S]

LOL yup

[Jamo]

How about an RS6 Master Cylinder as the next mod

Looks a bit of work that from the FA

Strangely the RS6 Master cylinder is about half the price of the S2 one!

[s2dude]

Looks a bit of work that from the FA

Strangely the RS6 Master cylinder is about half the price of the S2 one!

Sounds pretty critical though as the MC from an S2 is loads smaller than an RS6 one which is why pedal travel is so long....

They do this when guys fit M3 brakes on to BMW 325is and the like as braking is poo if there is no progressiveness due to mahoosive pedal travel...

Not to mention if you get brake fade (unlikely with these unless your tracking it) then travel will increase further and you may not actually be able to stop

Whos up for the how to guide

Fitting an RS6 master cylinder to the S2 for PROGRESSIVE factory feeling RS6 brakes (or Porsche ones)

[4WheelDrifter]

Nice work guys. Thanks for sharing the porn Ben, and the faiytale.

With regards to the caliper carrier - IIRC Lee braced his to the M14 strut to wheel bearing housing bolts.

Out of interest, what is the mounting bolt spacing on the RS6 calipers?

[Crawford_S2]

Awesome bit of brake porn posting, very impressed. Wish i hadn't just done my 996s though, they suddenly seem pathetic again

[Chris M]

Looks great Ben Some fine work there guys. Look fowward to further developments

[s2avant]

Sounds pretty critical though as the MC from an S2 is loads smaller than an RS6 one which is why pedal travel is so long....

They do this when guys fit M3 brakes on to BMW 325is and the like as braking is poo if there is no progressiveness due to mahoosive pedal travel...

Not to mention if you get brake fade (unlikely with these unless your tracking it) then travel will increase further and you may not actually be able to stop

Whos up for the how to guide

Fitting an RS6 master cylinder to the S2 for PROGRESSIVE factory feeling RS6 brakes (or Porsche ones)

I don't recall any mention of this setup NOT being PROGRESSIVE

I take it you have an RS6 master cylinder and an S2 one with you for a side by side comparison. Could you post pics of the differences and also clarify what makes the RS6 master cylinder better.

Ben

P.S I wouldn't compare my car to a BMW, I'm not someone you want to be on the wrong side of.

[Corey]

P.S I wouldn't compare my car to a BMW, I'm not someone you want to be on the wrong side of.

I hope you're not meaning the BMW is better ???

lol

[s2avant]

Yes, that's exactly what I meant

Ben

[s2dude]

I don't recall any mention of this setup NOT being PROGRESSIVE

I take it you have an RS6 master cylinder and an S2 one with you for a side by side comparison. Could you post pics of the differences and also clarify what makes the RS6 master cylinder better.

Ben

P.S I wouldn't compare my car to a BMW, I'm not someone you want to be on the worng side of.

Nope....just seen a picture of the master cylinder mate....
and having known a lot of people who have fitted M3 brakes to smaller cars like 325's or 328's I can tell you for a fact that the master cylinders on "these cars" (meaning...cough..bmws ) have very different capabilities....

eg// the 328 with the big M3 brakes (nothing like as big as yours) and its original master cylinder means that the foot has done approx 70% of pedal travel before any braking is felt...This is what I mean by progressive. Braking force should start and increase form the top of the pedal stroke....

Im not knocking your work pal. I think its a great job and gorgeous equipment...but it goes without saying that these calipers are about twice the size of S2 ones....meaning that it will take a lot more pressure to work them??!!

I've never felt RS6 calipers on an S2 so I cant comment fully on braking progession but from a technical standpoint and referring to other big brake conversions on other cars original master cylinders are often a problem.

Put it this way and this is purely a personal opinion that others may not hold but if I do a BBK with the porsche calipers which I am going to do as soon as Ive sorted my cars current problems out
then I will strongly consider upgrading the MC to a porsche or similiar spec one.

Reasoning for the extra power of a RS6 master cyliinder is purely that it is sized to push enough fluid to the RS6 caliper to provide "factory braking abilities"..

The S2 one is deisgned for the puny S2 original brakes though it would be great if someone can provide tech specs for the two of them (I will try and get hold of this info)

Note// This info/post was certainly not knocking the conversion....merely providing some extra info for everyones benefit :mischeif:

[Jamo]

Nope....just seen a picture of the master cylinder ....
and having known a lot of people who have fitted M3 brakes to smaller cars like 325's or 328's I can tell you for a fact that the master cylinders on "these cars" (meaning...cough..bmws ) have very different capabilities....

eg// the 328 master cylinder with the big brakes and its original master cylinder means that the foot has done approx 70% of pedal travel before any braking is felt...This is what I mean by progressive. Braking force should start and increase form the top of the pedal stroke....

Im not knocking your work pal. I think its a great job and gorgeous equipment...but it goes without saying that these calipers are about twice the size of S2 ones....meaning that it will take a lot more pressure to work them??!!

I've never felt RS6 calipers on an S2 so I cant comment fully on braking progession but from a technical standpoint and referring to other big brake conversions on other cars original master cylinders are often a problem.

Put it this way and this is purely a personal opinion that others may not hold but if I do a BBK with the porsche calipers which I am going to do as soon as Ive sorted my cars current problems out
then I will strongly consider upgrading the MC to a porsche or similair spec one.

If you search the forum you'll find that it's not required. There are technical posts detailing the MC capabilities

The RS2 has the same MC as the S2 and they use Porsche brakes as standard and the big red conversion doesn't require MC change either.

I appreciate your experience but the BMW and Audi can't be compared in this regard.