As hydraulic brake system designs evolved in the postwar era, so have the parts within them—with specific regard to the valves use to control the system’s hydraulic pressure.

You can read more about automobile hydraulic brake system evolution here: What’s the Difference Between Single- & Dual-Circuit Brake Systems?

And that’s particularly evident as vehicles moved from drum/drum to drum/disc, and now disc/disc brake setups. Over the decades, vehicle brake systems adopted components like metering blocks, distribution blocks, proportioning valves, and combination valves to help regulate the hydraulic pressure within each system.

(Image/The Stop Shop YouTube Channel)

So the brake experts over at The Stop Shop made this quick video that’ll walk you through each of those parts, explain why (and when) they were used, and where you’ll commonly find them in your vehicle’s braking system. Then the video talks briefly about an adjustable setup, which could come in really handy for performance/race applications and for those of you building a custom brake system.

It’s only about four minutes long and does a great job of explaining the key differences between each of those brake system parts, check it out: