[Toyby4]

HI Guys.. I just picked up a 92 reg cab 4x4 and have noticed that under quick braking the back wheels seem really grabby and sometimes lock up... any thoughts would be greatly appreciated before I take it in to get looked at.. I had a 91 extended can before and never experienced this... I sure its a simple problem...
Thanks

 

[MiltonWadams]

My truck's doing the same thing right now. I'm pretty sure its the rear brake proportioning valve that's out of adjustment. As far as I know, you just have to bend the rod on top of the rear axle to the proper height.
Anyone else had to adjust this?

 

[fourwd1]

To adjust the LSPV you don't bend the rod, you adjust the length of the link between it and the axle.

 

[maxpower_hd]

Here are the instructions from the manual. http://personal.utulsa.edu/~nathan-buchanan/93fsm/brakesystem/12loadsens.pdf

Mine does what you describe but only after they get very wet. Like the morning after driving home in a rain storm. Then it goes away. Is that what yours is doing or is it all the time?

 

[Toyby4]

Its been wet here and for sure it happens more in the wet.. I am assuming its because the roads are a bit more slippery.... Ill try the adjustment and report how I make out! THANKS GUYS!

 

[ohgood]

i guess a little grabby is better than squirting all that magic STOP-JUICE out the back like mine did.

before you adjust it, bleed your brakes till the fluid is clear, according to the manual. it's not easy, but it makes a difference. the rear brakes take much less force than the front to stop since the front is disc, rear drum. an air bubble up front means more pressure to stop = rear lock.

bleed till clear, then test, then adjust.

if you want to, get some speedbleeders. they make it less painfull.