s2 brakes!

[iow_corrado_g60 0]

hi all really quick query regarding s2 dual piston calipers wen u buy the calipers can u use the g60 carriers or do i need some s2 carriers and anything else 2?

 

also guys is it hard easy to get hold of some caliper carriers on there own?

 

Cheers Andy

[Karoliz 0]

You don't need anything extra. S2 calipers are "straight bolt'on" modification.

[Supercharged 2]

Thats not correct - you need the carrriers and the pads, and you also need to mount them on the 'wrong' side due to the edge location of the calipers on the Audi's, you will also need 400mm hoses!

 

You will also find the pads sit over inside the standard G60 discs creating a lip.

[yalan 0]

And the pads will wear to a taper seeing as the calipers have differential piston bores to counteract gassing. Putting them on the wrong sides (as you have to on the corrado) not only means that you haven't got staggered pistons to counteract the effect gassing has, but they instead contribute to further uneven pad wear.

[Supercharged 2]

Yalan - nice one, I wondered if that was also an effect, can you explain 'gassing'?

[yalan 0]

Apparently it was more prevalent during the time when pads used asbestos in their compounds but still true even with todays modern materials.

 

As the pads heat up, gasses are released across the surface of the pad. These gasses get in the way of the clamping forces and need to be either got rid of or dealt with in some other way. One solution is to use slotted / drilled rotors but these can be noisey or have other drawbacks such as cracking. An alternative is that since twin pot calipers tend to have big pads, what they did was introduce different sized pistons to alter the forces applied across the swept pad area.

 

In use, the leading edge of the pad heats and some gas is produced. As the disc surface passes through the pad, the gas build up is continually increased until it passes out the trailing end of the pad. If both piston sizes were the same, the clamping force on the disc would be stronger at the leading edge (as there is less gas there than at the trailing edge to overcome). By using calipers with differential bore sizes, they found that although not getting rid of the cause of the issue, they could balance out the forces applied by the pads to give even braking and even pad wear.

 

Swap a caliper with differential bore sizes from N/S to O/S and this will contribute further to tapered wear. And it doesn't take much to get a pad jammed in its rails.

 

Hope this comes out comprehensible!

[ben16v 0]

so are these any better than G60 single pots??