Caliper brackets

[MarkB]

If I were to make some custom caliper brackets to space out the standard caliper for a larger diameter disc, what thickness steel plate should I be looking at using?

Thanks

[rolskii]

Think you should be increasing the size of yr caliper/pads too....... if u got larger surface area to stop with.. ...?
why would you want to use standard calipers, as they will be applying the same friction area to the disc as before you did anything......

Unless u got a fetish for big bells .... ... its pointless making brackets or getting larger dia. rotors using stock calipers .....

[shineydave]

wouldn't larger discs offer more braking force as the friction point would be further from the centre of the wheel? admittedly there wouldn't be much of an increase but it would be an improvement

[rolskii]

In a leverage perspective - yes - but also dont think the s4 units will hug round a larger disc either, without compromising the reach the pads have in the caliper ... if you get wot i mean...
they wont sit over the disc as the caliper is made for a smaller radius rotor ....

[JonnyX]

Brake torque is governed by the leverage from the hub, piston force/area and pad swept area. Moving the caliper further away from
the hub will increase brake torque. As rolskii says, the radii need to be accounted for. The S4 caliper actually has very high brake
torque as the pistons are very large (even though it's 2 pot this is doubled as it's a sliding caliper). The problems are actually brake
fade and feel rather than stopping force (the stopping force is actually superior to the common 993tt 321mm brake upgrade).

http://www.ecstuning.com/stage/edpd/pag ... Stage%201R

[MarkB]

I'd like to point out that I'm looking at doing it on the rear, not the front. Note that the calipers are much the same on the rears of all Audi's (from what I've seen)

The advantage of going larger is also that there is more disc to disipate the heat and it looks better!

Anyone care to comment on the actual question?

[shineydave]

from an engineering point of view you'll need at least 1.5 times the diameter of the bolt to give you a spacer thick enough to have maximum pulling power from the threads. ie. if the bolt is 12mm the plate should be 18mm thick (1.5x12)

[MarkB]

I doubt I would thread the plate so was thinking along the lines of about 8-10mm think. Will use steel as I can weld it...

[shineydave]

so how you going to mount the calliper to the plate?

[MarkB]

The caliper is threaded, I beleave

[MarkB]

or am I wrong

[rolskii]

I doubt I would thread the plate so was thinking along the lines of about 8-10mm think. Will use steel as I can weld it...

[MarkB]

I doubt I would thread the plate so was thinking along the lines of about 8-10mm think. Will use steel as I can weld it...

Why? I've seen calipers mounted on thinner on some cars from the factory.

Admitedly less powerfull cars...

[shineydave]

from memory the hub carrier is threaded to accept the calliper mounting bolts so no problem at that end, the calliper has plain holes so the bolt will need to have something to screw into. you could use nuts but it'd not be the best solution

[MarkB]

I'll have to take a look on the car...