Amazon estate brake valve

[Bolbo]

Hello

I'm going through the single circuit brakes on a '68/'69 Amazon estate. I've come to the proportioner/accumulator valve on the line going to the rear. The brakes haven't been used for years and a the car has a non-standard engine, wheels and tyres, so I'm dubious about using the standard valve.

Has anyone used a manual brake proportioning valve with success?

[Army]

Originally Posted by Bolbo

Hello

I'm going through the single circuit brakes on a '68/'69 Amazon estate. I've come to the proportioner/accumulator valve on the line going to the rear. The brakes haven't been used for years and a the car has a non-standard engine, wheels and tyres, so I'm dubious about using the standard valve.

Has anyone used a manual brake proportioning valve with success?

As far as I can tell that valve is used on the single circuit systems - so look at the master cylinder. If there´s only one pipe coming out (instead of a split system where there is a pipe for front brakes are separate pipe for rear brakes on the casting itself) then you´ve got a single circuit.

With the single circuit you should also have the three piston calipers on the front: One big piston on the inner side and two smaller pistons on the outer side of the casting.

[Ron Kwas]

Bolbo;

Welcome to this Forum!

That is not a proportioning valve per se...it is a pressure reducing and limiting valve whose purpose is to prevent rear wheel lockup during quick and maximum Brake applications, resulting in spinning. It has nothing to do with "non-standard engine, wheels and tyres" only Brakes, so I recommend leaving it in place, and performing some Brake tests in a safe place, to assure it is working as expected, or asking to see relative Brake proportioning report for each the corners at your next MOT.

Cheers from Connecticut

[Bolbo]

Hi Ron

I'd read a couple of your other thread posts about the valve. My concern is that the engine and box that are fitted are heavier than standard, so the weight distribution between front and rear has been changed. With more weight over and in front of the front wheels the F-R ratio may need to be more front-biased than standard.

You're probably right about leaving it for now and seeing how noticeable it is.

Thanks.