I think you have it backwards.
A 10 psi RESIDUAL valve will apply your disk brakes enough that when jacked
up you won't be able to turn the wheels. You want a 2 psi on the disks and
a 20 psi on the rear.
In most cases you need a proportioning valve on the rears to balance the
front and rear brakes.
In some cases you also need a hold-off valve to keep the disk brakes from
being applied until the rears can apply also.
I solved this problem on mine by using brakes and master designed for a
disk/drum system on a similar weight vehicle with a similar front/rear bias.
I then used the combination valve from the same vehicle in place of a
separate hold-off and proportioning valve. I still needed residual valves
because my master is mounted under the floor too.
Steve@OldSub.com
www.OldSub.com
----- Original Message -----
From: "john howard" <johnhoward37@sympatico.ca>
To: <oletrucks@autox.team.net>
Sent: Wednesday, March 22, 2006 8:22 PM
Subject: [oletrucks] brakes
> I'm sure this has been beat'n to the ground several times on the
> list...But
> will someone please take some
> time out and load me up with information again...(thanks)
>
> I have front disc brakes on my 46 chevy panel and drums on the rear
>
> From what I have read ...I will need a 10 psi proportional valve for the
> front
> disc.
> and a 2psi proportional valve for the rear drums...Is this right?
>
> Is this all I need ?...do I also need adjustable proportional valve on the
> line somewhere
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