Do you think there wil be a market for such a braket using the exsisting front 312mm disc on the rear with the OEM caliper?

Its just that ive made a prototype and trailed it and it works great and is an improvement over the standard 256mm disc.

Im having a pair made from steel as the test ones are high grade alloy.

And although they are plenty strong enough, i just like the thought of something stronger and have them possibly case hardened to keep the ole rust off!

And just wondered if it was worth telling the machinist that i might want more!

I might be interested if you made more alloy ones.

I've had steel brackets made before, and just too heavy tbh, added an extra Kg per side :S

got any photos of completed setup ?

I contimplated making them out of alloy!

But are they strong enough? on the scale of things modern alloy is as strong as cast iron but 4 times weaker than steel!

Will it take the torque thats the thing

Also they wouldbe be that heavy as they arent that big, all they do is extend the caliper out 29mm!

Ill get some pics of the trail version at the weekend, might even leave both the alloy ones on my car and see how they fair.

Isnt there brackets made for the front to hold Porsche 6 pots out of alloy?!

Edited 25 July, 201114 yr by dannyboy759

The caliper carrier for my Compbrake 6pots is made from alloy block

When I got my 1st front brake upgrade ( Bremob DB7 GT calipers + 312mm disk ) they came with alloy carriers, which I too was concerned wouldn't be strong enough.

I had a set of high tensile steel ones made.

They where heavy - iirc alloy was roughly 300g, steel > 1Kg

I think alot comes down to design, and how much metal you've got, and how the load is applied

On the front, there is enough space to make the alloy carriers chunky enough to have the required strength

See on the other hand the front brackets that ive got for my Carerra brakes on the front are steel but then again the calipers are less than half the weight of the oem ones!

Thing is all the force is transfered vertically through the metal, which is the thickest part so im not really sure what to think!

Steel or Alloy

See Alloy would be best due to weight but then again its not really an issue as they arent going to be that heavy and better that than have an alloy one fail!!

Out of interest the rear pads are a fair bit smaller than the front ones, isnt this going to leave a fair bit of redundant disc that isnt swept by the pad?

Out of interest the rear pads are a fair bit smaller than the front ones, isnt this going to leave a fair bit of redundant disc that isnt swept by the pad?

Yeap! lol

It will be similar to what the Porsche calipers are like on 312 discs

But the thing is you dont what to use all the disc you want to keep the friction surfaces as is but move it out so it provides more torque

I was thinking more on the lines of uneven wear across the disc and corrosion build up on the unswept part.

The unused section of disk could probably be treated with something to stop it going rusty

To be honest tec, i wouldnt think that was a problem as ive had Porsche calipers on 312s for sometime now but like snow said id spray the unused area first, more for looks than anything

UPDATE!

Just been speaking to a company that fabricates parts for motorsport and they are going to make me the brakets out of high tensile alloy, basically the same as what ive made the prototype out of!

Once they are done, ill post some pics and them on the car.

Also.......... They are making a bracket to hold the oem caliper as a handbrake caliper and an extension to hold a 4 pot caliper, Probably Porsche as i have a set of 996 rears in the garage, much like what is fitted to a Lambo or an R8!

Once again im meet with the comapny on thursday and once ive mulled over a few options, when they are made ill post some pics!!!

Also.......... They are making a bracket to hold the oem caliper as a handbrake caliper and an extension to hold a 4 pot caliper, Probably Porsche as i have a set of 996 rears in the garage, much like what is fitted to a Lambo or an R8!

Once again im meet with the comapny on thursday and once ive mulled over a few options, when they are made ill post some pics!!!

Watching this with interest mate!! It wont be directly useful for me, but I could modify it perhaps for my rear 330mm's...

Steve

Watching this with interest mate!! It wont be directly useful for me, but I could modify it perhaps for my rear 330mm's...

Steve

I take it then that youve got a Comp Brake or a Tarox kit?!

This is what im looking st when done

Plus the normal bracket to hold the OEM caliper on a 312 disc!

After looking for sometime to see what options and prices things are and not finding much for big rear brakes apart from if you want to spend £700-800+ and nothing at all for the 4 pot rear set up there might be a market in these!

This was initially just a one off for my car but i might have a few sets done and see what i can do with them?!

Edited 27 July, 201114 yr by dannyboy759

I take it then that youve got a Comp Brake or a Tarox kit?!

This is what im looking st when done

Plus the normal bracket to hold the OEM caliper on a 312 disc!

After looking for sometime to see what options and prices things are and not finding much for big rear brakes apart from if you want to spend £700-800+ and nothing at all for the 4 pot rear set up there might be a market in these!

This was initially just a one off for my car but i might have a few sets done and see what i can do with them?!

Looks very nice!!

I have the CompBrake 330mm two piece rears on mine.

Will be interested to see these fitted up.

It's good to see something a little different being done with an Octavia. Nice one!!!!!

Steve

If the weight of the setup starts getting too heavy, some of these'll get the weight down

Compbrake 2 Piece Disc Conversion 312x25mm ( won't help with the budget though - £400 )

Someone like Godspeed might make someup cheaper

Recon a bell/rotor would cut at least 1Kg + from each side

The Compbrake 4pot 330x20 rear setup ( the 4pot caliper looks like it taken off a bike ) - that's your £800 option

Still recon the original rear calipers on 312mm discs will be a worthy mod in it's own right. As you mentioned in a earlier post, the extra braking force should be noticable ( exactly the same logic as converted 288mm fronts to 312mm fronts ).

Keep up the good work

I really wanted to use a disc that was already available due to firstly, that it will fit on the car straight out of the box and secondly cost!

I know a fully floating disc is better, due to heat and expansion and contraction of the disc plus like has been said its lighter.

But un-sprung weight isn’t really that pertinent on a road car providing its not going to be massively heavier so a KG a side isn’t really here nor there in the scheme of things!

Having 312's all round should be ideal in the respect of braking force, I’ve always thought the Octavia was under braked at the rear especially after having BMW's and Audi's that have big discs all round even on a standard run of the mill car!

If i remember correctly a Boxster has 298mm up front with 293mm or something like that on the rear!

So 312 all round would be ideal and that way if you ran Boxster callipers all round you’d get practically the same braking force, or if you only wanted to have 4 pot fronts you could just fit a bracket to have 312mm on the rear with the OEM calliper, give a bit more flexibility.

I’m using Boxster fronts with the standard 256mm disc on the rear and I don’t think the balance is great, the front out brakes the back far too much and having bigger brakes on the rear would sort this out whether it was the standard calliper or using 4 pot rears of something like a Boxster or Carrera.

Plus if you think of the cost you can get 2 new 312mm's for about £50 for the rear of the car, Boxster front callipers for between £200-50 plus the brackets for them £80 ish.

A set of rear Boxster rear callipers for under £200 as no one wants them as they are no good up front! Plus the cost of one of my brackets!

So you could go from standard VRS brakes to 312mm all round with Boxster front and rear callipers for sub £700!

Just makes things a bit more cost effective rather than buying Compbrake discs or Tarox which when they wear out you have to go back to them and sell another kidney to buy a new set!

You could just go to GSF or Eurocarparts!

Edited 27 July, 201114 yr by dannyboy759

Will have the brackets to mount the 312 disc and oem caliper in a week or so!

Will post pics as soon as ive got them.

The Porsche brackets will take a while longer!

Another one on this!

I dont know what the opinion is but ive delevloped a bracket to hold the Porsche 4 pots on the rear but it goes behind the stub axle, behind the flange that mounts that!

It just means that it will push the rear wheels out 10mm each!

Then ive had a set of spacers made to push the standard rear caliper out 10mm to match!

Still in the delevolpement stage at the moment but but just wanted to know what you guys thought of it pushing the rear wheels out 10mm?

If people are against it then there are a few other ways of putting these calipers on the rear but this way seamed the most logical and straight forward.

Opinions?

From a performance point of view I'd avoid spacers if at all possible... Call me old school but I don't agree with them things!!

A slimline 4piston calliper is really what's required.

Steve

From a performance point of view I'd avoid spacers if at all possible... Call me old school but I don't agree with them things!!

A slimline 4piston calliper is really what's required.

Steve

Ok well not spacer as such but a braket to move the OEM caliper over, this would also be part of the braket that will move the caliper out for the 312, sop there wont be any spacerS, dont quite know what i was thinking lol

Is the end result is that the rear wheels are still being moved out further ?

Is the end result is that the rear wheels are still being moved out further ?

The easiest way to make the braket would result in that

But there are other ways of doing it!

Just wanted to see what people thought if the rears did go out 10mm?

iirc moving the rear wheels out will invoke further oversteer, unless the fronts are moved out to compensate

imo much better to stick to OE offsets

Would save a lot of hassle with different alloys too

iirc moving the rear wheels out will invoke further oversteer, unless the fronts are moved out to compensate

imo much better to stick to OE offsets

Would save a lot of hassle with different alloys too

Yeah know what you mean, thought of that and tobe honest more oversteer wouldnt be a problem as they understeer too much anyway.

But after thinking about it last night ive come up with another solution that will mount both the 4 pot and the oem caliper in the original mounting points.

The thing is im only going to this lenth as ive got spare Porsche calipers in the garage!

I think the rear 312mm upgrade will be more than enough and will ballence the car up nicely and i should get the brakets back in a week or so

Perhaps 4 pots on the rear isnt really needed and might be a bit of an over kill?!

Although saying that for guys that have 4pot fronts!

If you look at the figures

Im using boxster fronts and boxster rears, the discs im using will be 312 all round where as the boxster uses 298 fronts and something like 295 rears and both cars are about the same weight!

I know the boxster is rear engine, so those that are going to point it out! but overall with the mass of the vehicle it should be a perfect brake set up!!!!