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**MikeB** · 01-13-2015, 09:58 PM

The latter half of this video is a good demonstration of how the metering valve works. All it does is delay pressure to the front brakes. But you can see how both front ports should have the same pressure.

I still don't have a real handle on the inner workings of the prop valve, but I know that it limits maximum pressure to rear drum brakes in a disc/drum vehicle. Of course, you're stuck with the preset pressure determined by the spring.

https://www.youtube.com/watch?v=PlElcEGjfd8

01-13-2015, 09:58 PM	#12
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,669	Re: Proportioning valve issues. The latter half of this video is a good demonstration of how the metering valve works. All it does is delay pressure to the front brakes. But you can see how both front ports should have the same pressure. I still don't have a real handle on the inner workings of the prop valve, but I know that it limits maximum pressure to rear drum brakes in a disc/drum vehicle. Of course, you're stuck with the preset pressure determined by the spring. https://www.youtube.com/watch?v=PlElcEGjfd8 __________________ Mike 1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!