Universal Disc Drum Brake Proportioning Valve With Smooth Stopping Power For Heavy Duty Rides Straight Swap Replacement Hydraulic Split Line Adapter No Sweat Install Compatible AC Delco 1721353
✔️ Single 1/2 & 7/16 in ports pairs with 3/8 & 9/16 outputs
This single piston brake proportioning valve manages hydraulic pressure for vehicles switching from drum to disc setups. It acts as a handy hydraulic split line adapter that prevents rear lockup while keeping stopping power smooth. You will install it behind the master cylinder on classic trucks, muscle cars, street rods, or older GM Ford and Mopar chassis to finish a straight swap without bleeding issues.
✅ Matches factory AC Delco 172-1353 design for direct bolt-in mounting✅ Front inlet measures 1/2 inch x 20 thread with rear 7/16 inch x 24 port
✅ Front outlet threads at 3/8 inch x 24 and rear connects via 9/16 inch x 18
✅ Built alloy casting houses brass valves and a single wire warning switch
💡 How does a disc drum combination proportioning valve improve stopping distance on upgraded street rods Selecting the right hydraulic component requires matching port threads and maintaining steady fluid flow through your braking circuit. Proper installation protects your hard lines and keeps pedal response predictable under heavy load. Here is how the geometry works out. - Factory 1/2 inch and 7/16 inch input nipples pair directly with common steel tubing - Output sizing matches standard brake hose fittings to avoid cross threading leaks - Internal residual spring maintains line pressure for disc rotor grip without dragging - Integrated ground wire trigger activates dashboard warnings during low fluid conditions
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