Alright gearheads, listen up - these residual valves are seriously important if you're working on custom builds or restoring classic rides. Here's the deal: these little guys maintain either 2 pounds or 10 pounds of pressure in your brake lines, which is crucial when your master cylinder is mounted below the floor or when your wheel cylinders are above it. The 2LB version is perfect for disc brakes, while the 10LB is what you need for drum brakes. They've got pipe threaded connections on both ends and work with standard 3/8-24 inverted flare brake lines. Super important warning though - when you're installing these, be crazy careful with that black washer because if it falls out, good luck finding it again! Might even want to remove it before taking your car to a shop. These are exactly what you need for those street rod projects, custom builds, or any vehicle where you've relocated the master cylinder. Just double-check your vehicle specs before ordering to make sure you get the right fit.
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