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Re: Ur-Q rear brake mod/questions...


rear brakes on the "rr" are: -

43mm piston diameter
12mm pad thickness,
120cm*2 pad area (4)
269mm x 20mm disc dimensions (ventilated)

other data: -
25.4 master cylinder dia
new brake servo (24mm piston dia), 3.8:1 assistance
higher delivery pump pressure (100-110 cf 68-82 bar)

fronts: -

40/45mm piston dia
13mm pad thickness
224 cm^2 pad area
276mm x 25mm disc dimensions (ventilated)

'95 rs2
'90 ur-q

>Date: Sun, 8 Mar 1998 16:54:01 -0500 (EST)
>From: audidudi@mindspring.com (Jeffrey J. Goggin)
>I know Audi used the same size/width rotor on the 20V Ur-Q but can't find
>out what diameter pistons they used in the calipers ... does anyone have any
>input on this?  I'm assuming the slight misalignment is a production
>tolerance thing rather than a mix-and-match problem caused by using an S4
>rotor instead of an "official" Ur-Q rotor ... if anyone has any BTDT about
>this upgrade, I'm all ears.