rear brakes not doing their share on G60'ed urq

[JShadzi at aol.com]

Brady, you're pretty much right about the rear brakes, they do about 20% of the braking/slowing at most.  You want to find that careful balance in an Audi, because so much of the weight of the car is up front, the rear brakes can get real "lockey" if you're not careful, which is much worse then them not doing "as much" as the fronts.

A proportioning valve will allow you to adjust this bias, but due to the very dangerous and unnerving nature of locking up only your rear brakes, you may find yourself at the balance you have now.  In my 80tq with 13" Big reds in the front, I'm still using the stock bias, under hard threshold braking you'd swear your eyes are being pulled out of their sockets, and I've never been too concerned with what the rear brakes are doing so long they never lock up, they're not contributing that much to the whole event of slowing down anyway...

Of course if you have ABS, then go as big as you want since the ABS will keep things from locking up for you.

Javad

>Hi All,
>
>My still-new-to-me 83 UrQ has G60 front calipers, which work fine. It has
>stock rear brakes which don't work as well. They heat up significantly under
>spirited driving (so they're doing some work!) but not nearly as much as the
>fronts. It really feels as if the fronts are doing almost all of the
>braking. On Louis-Alain's 83 UrQ with stock brakes all around, braking is
>much more balanced, and, I suspect, stronger.
>
>Have the G60 calipers' extra appetite for brake fluid unbalanced the braking
>system?
>Do I need an adjustable proportioning valve so that I can get more line
>pressure to the rears?
>
>Any other ideas?
>
>BTW, the car brakes straight, and nothing sticks.
>
>Cheers,
>Brady Moffatt
>Montreal, Quebec, Canada
>83 UrQuattro with 51,000 miles
>86 4ksq with 310,000km
>86 4ksq parts car
>72 Datsun 240Z with 180,000 miles
>92 VW Golf with 200,000km FOR SALE
>in middle stages of quattrosis accumulatus
>
>
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