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Old June 16th 2008, 08:18
Angelo Amato's Avatar
Angelo Amato Angelo Amato is offline
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brake bias...

finally got my fastback on the road and had a few shakedown runs.

got a couple of issues, one is brakes.

here's the tech bit :-

front:- Audi coupe sliding calipers
rear:- Golf Mk4 calipers
m/c :- Porsche 944
brake bias valve on rear

having driven the car a bit now, i think it needs MORE bias to the rear, fronts work well but easlily can be locked up.

thinking of using 'residual brake pressure valve' on rears.

any thoughts appreciated.

THANKS! and nice to be back on the innovative forum!

Angelo
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Old June 16th 2008, 10:20
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Why not try removing the brake bias valve from the rear, they are pressure limiters at the end of the day...
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Old June 16th 2008, 11:26
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Angelo Amato Angelo Amato is offline
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brakes

hi,

what a great idea ! and free! (seems obvious really )

it is turned up full but i guess as you say, it must have some loss through it.

Will give it a try.

Cheers.
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Old July 29th 2008, 19:24
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Angelo Amato Angelo Amato is offline
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Bias calculator

Had a quiet spell in work so knocked up the infamous Bias Calculator in an excel spreadsheet, if you are like me, you can change the numbers to your hearts content and see what difference the various sizes make.

enjoy ! Angelo

http://myweb.tiscali.co.uk/angeloamato/BIAS.xls
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Last edited by Angelo Amato; July 29th 2008 at 19:26.
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Old August 4th 2008, 10:04
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Quote:
Originally Posted by Angelo Amato View Post
hi,

what a great idea ! and free! (seems obvious really )

it is turned up full but i guess as you say, it must have some loss through it.

Will give it a try.

Cheers.
When screwed full down (or is it up?) there is no loss of pressure and you should have full pressure to the rear. I'm not surprised that you have excessive bias to the front especially as the front calipers were designed for a very front heavy car and the rears for a car with a light rear end - arse about face really ! If you want to retain the calipers in their relative position I would seriously think about a balance bar set up that will give you a much bigger range of potential bias.

evilC
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Old April 16th 2009, 17:00
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bad link

does anyone have a copy of said spreadsheet?
It would seem useful but it seems the link is dead.

Thanks.
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