Rear brake bias valve I think

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Paul02

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Hello while restoring the rear axle etc came across what I think is some sort of bias valve for the braking system . From memory it was bolted to the diff hanger .

Is this part still available and does anyone have a part no. and can it be done away with or replaced with something else .

Mine looks in bad shape on the outside and don't know if it even works .

What have you guys done ?

Thanks Paul
 
sadly, the part is NLA. it can be rebuilt. i have heard of people removing it and replacing it with a T fitting. i just can't speak to the viability of this idea ... or to ability to speak to how well it works. actually M5bb (Gary) + i were speaking of this yesterday.
 
rsporsche said:
i have heard of people removing it and replacing it with a T fitting.
Click to expand...

A better solution would be to install an aftermarket biasing valve. Wilwood and others sell them. The aftermarket ones are adjustable, so you'd need to play with it a bit to get the correct setting.

brake-valve-wilwood.gif
 
the Wilwood valve looks like it will require a little change to our system. if i am not mistaken, our pressure regulator has 2 outlets (1 for each side), and the Wilwood has one inlet / 1 outlet.

no argument that Wilwood makes great products ... and this valve is only 57 bucks from Ireland. cheaper than getting the stock piece rebuilt.
 
Paul02 said:
Hello while restoring the rear axle etc came across what I think is some sort of bias valve for the braking system . From memory it was bolted to the diff hanger .

Is this part still available and does anyone have a part no. and can it be done away with or replaced with something else .

Mine looks in bad shape on the outside and don't know if it even works .

What have you guys done ?

Thanks Paul
Click to expand...

Looks can be deceiving. In addition to deQ's excellent writeup, the unit can be tested and adjusted as described in the manual.

Brake pressure limiter - checking
Connect a high pressure gauge to the front end rear axle brake circuit and a second gauge to the rear brake caliper. Depress the brake pedal and hold down with the pedal prop.
Click to expand...
Until a pressure of 20 atü (285 psi) is registered, both pressure gauges must indicate the same reading. From 20 atü (285) upwards, the pressure at the rear fixed caliper should be correspondingly reduced as
shown in the diagram. A output pressure B input pressure C tolerance range If the measured values differ from the nominal values, the repaired rear axle pressure can be set with the adjusting screw when the brakes are released. Screw out - increases rear axle pressure Screw in - reduced rear axle pressure Prevent the adjusting screw and castellated
nut from turning with Klebert M 28 sealer.
Click to expand...
34100003_z.jpg




34100001_z.jpg


34100002.jpg
 
I think I'm going to throw out my Blue Books and just follow DQ's "How to" with the excellent pictures.
Heck, I'm going to print them all, create a book and sell on Ebay for more than the Blue Books.
DQ, your posts are really extraordinary. Keep up the great work.
:-D
 
andre said:
I think I'm going to throw out my Blue Books and just follow DQ's "How to" with the excellent pictures.
Heck, I'm going to print them all, create a book and sell on Ebay for more than the Blue Books.
DQ, your posts are really extraordinary. Keep up the great work.
:-D
Click to expand...

thank you andre, if you do what you plan, send me something for christmas, ha, ha, ha ;-)

remember that you can find all the threads with DIY jobs by following this route:

click on my nickname in any post

dequincey
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find al threads started by dequincey

you will find them all there, is a good thing of this forum that even the old ones are kept safe
 
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Hi DQ,

Of course, I'm kidding about producing a book for sale but you may want to consider it. When I have more time, I'm considering to actually print all your Posts with instructions/pictures and then place them in the appropriate sections of the Blue Books or create a separate book with cross reference to the Blue Books. It can only help.

I'm waiting for you to take an engine completely apart, rebuild it and then put back together with step by step instructions and pictures. :mrgreen:
 
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