AAN into Ur quattro, 400-450 Bhp Target

[robo]

My brakes are still not quite as good as they could be.

They have the power is just about good enough, but take a lot of pedal effort.

Looking to improve both.

What's on the back?

[URquattroGus]

What's on the back?

The standard fit WR ur quattro rear calipers with uprated pads. Later cars have vented discs.

I belive the later 20V quattro had rear vented discs, but I'm not sure if this would really make much difference? Mainly better for heat dissipation under hard use.

[Acidburn]

depending how much bigger than the one's you currently have fitted it would probably help slightly with keeping the car level under braking so its not nose down all the time.

[adam g]

Which side of the car is your master cylinder, if you converted from a 10v im guessing the MC is passenger side. Ive heard moving it back over in conjunction with a 20v swap (which creates the space needed) reduces losses and gives better performance. There is a blanking plate on the body to plug it into.

[Acidburn]

Which side of the car is your master cylinder, if you converted from a 10v im guessing the MC is passenger side. Ive heard moving it back over in conjunction with a 20v swap (which creates the space needed) reduces losses and gives better performance. There is a blanking plate on the body to plug it into.

And should do away with the long bar that goes to the other side that the passengers can press if they are bored and suicidal.

[adam g]

Just wanted to add, the guy that recommended this also converted to a vaccum system from a normaly aspirated whilst at it. Im tempted but not sure how much work is involved.

[URquattroGus]

Which side of the car is your master cylinder, if you converted from a 10v im guessing the MC is passenger side. Ive heard moving it back over in conjunction with a 20v swap (which creates the space needed) reduces losses and gives better performance. There is a blanking plate on the body to plug it into.

Yes it was a 10V and the master cylinder is on the passenger side, but I think that all RHD quatto's have the master cylinder on that side.

As you and Acidburn say, there is a long rod that goes over from the pedal to the passenger side, a la heath robinson style.

There is a little play in this linkage, I managed to order some of the pins which I mean to change when I get round to it.

I want to avoid converting to vacuum really, as I would have to re package quite a lot of things, and I have spent a lot of money on renewing the Hydraulic assist circuit.

I think I need to find out whether the 20V RR rear calipers are actually that different appart from being vented, ie, bigger piston area or clamping area?

Wouldn't be too hard to try a bigger MC though and see how it feels. Having said that, the system is a real bitch to bleed!

[Acidburn]

yes they are bigger. Thats why they can be used on s2's for brake upgrades

[jsws3]

Yes it was a 10V and the master cylinder is on the passenger side, but I think that all RHD quatto's have the master cylinder on that side.

As you and Acidburn say, there is a long rod that goes over from the pedal to the passenger side, a la heath robinson style.

There is a little play in this linkage, I managed to order some of the pins which I mean to change when I get round to it.

I want to avoid converting to vacuum really, as I would have to re package quite a lot of things, and I have spent a lot of money on renewing the Hydraulic assist circuit.

I think I need to find out whether the 20V RR rear calipers are actually that different appart from being vented, ie, bigger piston area or clamping area?

Wouldn't be too hard to try a bigger MC though and see how it feels. Having said that, the system is a real bitch to bleed!

If you ask Pete nicely to have a look at my rear brakes next time he goes over to aidens and measure the pistons on them for you as they are 20v rears .

[URquattroGus]

According to the brakes international website;

WR:

Disc Thickness: 10mm
Disc Diameter: 245
Piston Diameter: 36.1

RR;
Disc Thickness: 20mm
Disc Diameter: 269mm
Piston Diameter: 42.8

A bigger Upgrade than I thought then! an 18.5% increase in piston area to be precise...

I had put this off for a while as the rears were replaced when I first got the car, and people seem to constantly harp on about the fronts doing nearly everything.

However, bigger pistons mean that I will probably gain a bit more pedal travel? and so may also want to try a bigger MC still?

[ralleyquattro]

According to the brakes international website;

WR:

Disc Thickness: 10mm
Disc Diameter: 245
Piston Diameter: 36.1

RR;
Disc Thickness: 20mm
Disc Diameter: 269mm
Piston Diameter: 42.8

A bigger Upgrade than I thought then! an 18.5% increase in piston area to be precise...

I had put this off for a while as the rears were replaced when I first got the car, and people seem to constantly harp on about the fronts doing nearly everything.

However, bigger pistons mean that I will probably gain a bit more pedal travel? and so may also want to try a bigger MC still?

I have vented in the back and Sport Quattro AP calipers up front, with standard WR master, no issues and minimal pedal travel, very happy here.
I also switched to vacuum assist.

Hope this helps.

[DamoM]

Vacuum has transformed the brakes on my car. They were axactly as you described before despite me havng a porsche caliper front setup and 20v rear calipers. Going ot vacuum was the single best improvement to braking that I have ever made on the car.

It wasn't even that much work to be honest.

[DamoM]

Looking to change the MD357 on my car (see seperate thread) and wondered if djones managed to change to the 0.82?

[URquattroGus]

Yes, I think so, think there is a thread? Seem to remeber he was happy with the change. I'll have to make do with my weedy little turbo for now

[AndyP]

Yes, he has changed to the 0.82 housing

http://www.s2forum.com/forum/showthread.php?t=59305