Brake Proportioning Valve

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Terry Johnston
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Brake Proportioning Valve

Post by Terry Johnston » Tue Jun 03, 2008 6:53 am

On a Alfa BB thread about improving GTV6 braking it was mentioned that braking could be improved on the earlier cars by putting in a later brake propotioning valve. Does anyone on this board have experience with this modification? I notice that IAP lists two valves; one through car 6831 (81-85) and ont for the post 631 cars. Would the later valve be a direct bolt on or would modifications be required?


Terry Johnston
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Daniel
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Post by Daniel » Wed Jun 04, 2008 7:07 pm

I thought the later cars had a joiner in place of the pressure limiting valve (it is not true proportioning). I know that there are plenty over here that have tossed away the limit valve and put in the joiner from a late model - it is a bolt in.
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MD
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Post by MD » Thu Jun 05, 2008 12:09 am

Terry,

I dont use the limiter in my car just installed a joiner. Works very well after bleeding the system of course..
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mjr
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Post by mjr » Thu Jun 05, 2008 4:21 am

so it begs the question, why did alfa install the proportioning valve in the first place, if removing it results in such an improvemnt in braking. Surely removing it, screws up the brake balance for every day driving, or why put one in in the first place?

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Post by MR2 Zig » Thu Jun 05, 2008 5:26 am

I think, for legal reasons mostly, the factory wanted to make absolutely sure that when the brakes locked up the fronts locked first. That way the car would be more likely to go straight forward in a skid instead of trying to swap ends.

'Tis my theroy anyway.

Scott
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