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Removing GQ brake proportion valve

Posted: Mon Oct 15, 2007 8:38 am
by Sandy Rut
I am building a long travel rear end in my ute and want to piss off the proportioning valve. No - I dont want to keep it and just use a spacer bracket on my diff.

Has anyone here done it?
If so which line did you remove and does it matter?
Any problems without it?

No Guess's or assumptions thanks ;)

Vehicle has GU twin pots on front, 1988 GQ disc rear, 1988 GQ booster

Posted: Mon Oct 15, 2007 3:55 pm
by nzdarin
I've removed it from mine. I have removed the brake line from the block, below the booster, right through. I now only have one line running to the rear. So I now have 50% of the pedal pressure going to the rear. This doesn't mean 50-50 brake split as the rear pistons are smaller and so give less brake force. Well that is according to the engineer that certified the mod. Before this I had the valve cable tied shut and it gave the same result. This is just a lot neater.
The biggest difference to running the valve is that the rears lock up if braking hard down hill on a loose surface. No big deal and very pradictable. When in 4wd it makes the braking much much better as you have maximum force and since it is 50-50 split, the rear can't lock without the front ayway.

Posted: Tue Oct 16, 2007 8:23 am
by Sandy Rut
Thanks that was the reply I was hoping for - Good Info :D :D