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Hello all im rebuilding an 86 4 runner and need some help.
The truck has rear disk brake upgrade from previous owner and has a brake fluid leak from a part i need help identifying. Thanks in advance
It's a load proportioning valve. As the load gets heavier in the bed of truck, a rod engages the valve, and increases brake pressure to the rear brakes.
The rod fits goes into the slot in the whitish plastic piece. Looks like you are missing parts. I have a 2wd, so mine is a little bit different setup but similar.
That bracket with the hole on each end looks to be where the rod would have been mounted. Not sure where the other end bolts too. On a 2wd it bolts to the rear differential.
Last edited by snippits; Oct 31, 2018 at 10:19 AM.
It's a load proportioning valve. As the load gets heavier in the bed of truck, a rod engages the valve, and increases brake pressure to the rear brakes.
The rod fits goes into the slot in the whitish plastic piece. Looks like you are missing parts. I have a 2wd, so mine is a little bit different setup but similar.
That bracket with the hole on each end looks to be where the rod would have been mounted. Not sure where the other end bolts too. On a 2wd it bolts to the rear differential.
THANKYOU! I was able to find alot of information after your post. I run 35s so i think i will be deleting the valve and seeing how stiff brakes are after
THANKYOU! I was able to find alot of information after your post. I run 35s so i think i will be deleting the valve and seeing how stiff brakes are after
Just bend the rod up, so .. ah wait... :p
If you take it out of the mix, on snow or such slippery stuff, your ass will 180 on you like pulling a handbrake. Install a valve. Or, manipulate the existing one so it always delivers the most pressure aka "up" position. Weld it to itself.
If you take it out of the mix, on snow or such slippery stuff, your ass will 180 on you like pulling a handbrake. Install a valve. Or, manipulate the existing one so it always delivers the most pressure aka "up" position. Weld it to itself.
welding in the up position should have the same effect as bypassing it entirely, ie, full pressure to the rear brakes. so, why bother?
Also, the fact that the rear brakes have been converted to disks may require different proportioning to the rear than what the drum brakes had originally.
Regardless of what you do to get correct proportioning to the rear brakes, you will need to replace the existing valve as leaking brake fluid is very dangerous!
Little update: I removed the Load proportioning valve and it has fixed the spongeyness to my brakes and they are working great on the road and slamming the truck around some. Next is to test it in rain and on the trails. I feel like with my 35s i will not need a new valve
Oct 31, 2018 | 07:40 AM
