Hey there I am having alot of trouble with my back brakes locking up when I put the brakes on and the hole pickup starts sliding side ways,(bit crazy in the wet)Is there anyway to have the front brakes coming on more than the back thanks  

If master cylinder is okay, you could install either slightly small rear wheel cylinders or a different master cylinder with a smaller bore for rear brakes.  

WOULDNT THAT BE A BRAKE PROPORTIONING VALVE PROBLEM?...SOMTHING IN THE VALVE NOT OPERATING PROPERLY AND ALLOWING TOO MUCH FLUID TO THE BACK BRAKES?  

Maybe in a stock new vehicle but not in a older one or with a lift.  

snoman, it's an 85, not a '25....it's got a proportionong valve. There's only a couple things it can be. Your workin on a simple hydraulic brake system, not breedin pandas. My first question would be: are the front brakes grabbing or are they working at all?  

The front brakes work,just that the back brakes are locking up and there is a proportioning valve at the front of the pickup,can you adjust the value???  

fatguy4X4:
snoman, it's an 85, not a '25....it's got a proportionong valve. There's only a couple things it can be. Your workin on a simple hydraulic brake system, not breedin pandas. My first question would be: are the front brakes grabbing or are they working at all?

Do not get cute here. Proportioning valves are a bandaid fix at best. Some depend on suspension postion and some on pedal effort/fluid flow and pressure but I have yet to see one that was smart enough to work right all the time. This is way they went to ABS and did away with valves completely. (P/U's where amount the first to get rear ABS) The real cure here if you want to take the time is to juggle master cylinder or wheel cylinder bore size. In rear, pull a wheel cylinder and measure bore diameter and get one with about a 1/8 inch smaller bore and this should fix problem.  

heres another ave. to check...i asked my tech in the shop and he said that 9 times outa 10 that its something w/the back brakes,either the wheel brake cyl is leaking and got fluid all over the shoes and made them extra grabby or the rear seal went bad and did the same as the wheel cyl did.or he said that the rr shoes will grab and lock up the rear brakes if the shoe lining is gone and your stoping w/just the table and its grabbing the drum.
hope this helps...  

I have used the wheel cylinder size change trick before to increase or decrease braking. It works well if you take the time to do it.  

Thanks guys will look into it  

any luck on your brake problemo?  

If i were you i would not waste the money upgrading your drums, just go to roughstuff.com and get there rear disc brake brackets for about 60 bucks. take the parts off a dana 44 and then you have disc brakes all the way around.  

There is nothing wrong with drum brakes when properly sized. My 2000 K3500 has drum in rear (13 x 3.5 inches) and it never even thinks about fading even when severely loaded.  

breeding pandas HAHAHA