How A Brake Proportioning Valves work

Today in the garage we talk about how a brakes systems proportion valve, hold off valve and combination valves commonly found on classic Camaro, Chevelle, Nova and Chevy Trucks work. Also shown are combination valves finish options when purchasing a 4 wheel disc brake conversion.

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[tonycordovatc]

I have a leak coming from the failure warning switch. I've changed the o-ring on there and even tried a different switch but still leaks when I brake. Any suggestions?

[readplanet]

Thank You sir. Your educational video was the best explanation concerning brake components, and it helped me to have a better understanding of how those components work together. Keep up the good videos. Have A Good Day! 🚗🚙🛻

[tonyisme]

Ok I have a 1990 Toyota 4Runner w/ manual transmission 4x4. I have disc rotors on front, and drum brakes on rear. I use OEM Organic pads. I bled my brakes, my brakes work, no leaks. I don't have ABS. Sometimes when I slowly exit the driveway, I will tap the brakes and one of the rear tires will briefly lock up and release, leaving a 8" streak/tire skid in the driveway. Its random, it can be one wheel or the other rear wheel with drum brakes. It only happens at very low speed. Any ideas? I have new dot 3 brake fluid, I never mix synthetic with conventional brake fluid. I have that Load Sensing Proportional Valve in the rear on the vehicle. Its 34 years old, original. Could it be that? Its not my wheel cyl, they are new. They are OEM and I changed them myself, thiinking they were problematic. But they are not. The master cyl is original. But my brakes are working.

[leemontoya]

I just barely touch the brake and the back tires lock up! it's a 60 chev! any idea's?

[michaeledwards]

Do I really need a proportioning valve?
I run classic style 225/90R16. I usually drive 3-5 mph under the speed limit in the right lane and don't drive faster then 55, maybe 60 on a highway. Also I only drive the truck about 4, 000 miles a year.

[ladariens]

Anyone know where the proportioning valve is located on a 06 impala 3.9 v6?

[BIGSTANK]

Why couldn't someone make something like this out of needle valves? Just curious

[ryana.miller]

This video says nothing about how a proportioning valve works. It talks about what a proportioning valve is, what it does, and why it's important but gives no explanation on how it works as the title would suggest. It's not a bad video, but it has nothing to do with what the title says.