What is a load sensing proportioning valve?
The load sensing proportioning valve is located in the brake system for the rear wheels. It functions to control the brake fluid pressure from the master cylinder in response to the vehicle load and prevents early locking of the rear wheels.
What is inside a brake proportioning valve?
It is a spring-loaded component that activates when fluid pressure builds when you step on the brake pedal. Then, the valve’s plunger unseats and fluid rushes into the calibrated range. Once this happens, the spring gets compressed and the plunger blocks the fluid from passing through.
How does Toyota load sensing proportioning valve work?
The idea of that thing is to increase pressure to the rear brakes as the load in the bed increases, and decrease proportionally as load (weight) is removed to avoid rear lockup. The adjustment is only there for factory setting, and Toyota does not reccomend we adjust.
Can you bypass a load sensor proportioning valve?
Drum brakes need alot less line pressure than discs and this is the reason for it on your station wagon. If you remove it or bypass it you will end locking up the rear wheels one heck of a lot and one rainy day in a corner…. You get the idea.
Where is the proportioning valve on a 4 wheel disc truck?
Would be surprised they would use that valve with 4 wheel disc. Normally on a 4 disc set up you just have a proportioning valve just off the master cylinder. That is even used with most disc/drum setups except a metering valve is added in for the combo. That valve is mostly on trucks, but is on the station wagons with rear drum brakes.
Where is the bleeder valve on a Toyota LSPV?
I started troubleshooting the problem at the master cylinder. I bled it then move to the disk brakes (front) then back to the rear/ drum brakes. Getting no fluid in either brake at the bleeder valve I traced the line back to the bleeder valve in the LSPV.