Product Summary

Universal Fit, Disc/Drum Brake System Type, Aluminum

  • This adjustable proportioning block serves several purposes which dramatically reduces the amount of fittings needed and reduces the potential for leaks
  • Dual front brake line outlets eliminates the need for a T fitting for the front brakes
  • Built in pressure switch allows you to conveniently operate your brake lights
  • 3/8"-24 inverted flare female inlets and outlets allow the use of common 3/16" brake lines for a quick nand easy installation
  • Five stainless steel 3/8"-24 flare nuts and a wiring pigtail for the brake light switch are included making this a value that can't be beat

Key Specs

Proportioning Valve TypeKnob Adjustable
Port Quantity4-Port
Material TypeAluminum

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This adjustable proportioning block allows you to run lines from the master cylinder to the block and then to the appropriate wheels. What is neat about it is that it also contains the proportioning valve and brake light switch. This dramatically reduces the amount of fittings needed and potential leaks.

The adjustable proportioning valve regulates rear brake pressure, helping to maintain correct brake bias between front and rear brakes. It is designed for dual bowl master cylinders. The distribution block connects to the master cylinder and distributes brake fluid to all four wheels. An easy to turn handle with directional arrows makes it simple to either increase or decrease rear brake pressure.

The block accepts 3/16" brake lines and the inlets and outlets on this unit are 3/8"-24 inverted flare females.  It has two inlets from the master cylinder, two outlets to the front brakes and one outlet to the rear brakes.  It includes five stainless steel 3/16" fittings and wiring pigtail for rear brake light switch. Mounts to any convenient location. This is not a direct factory replacement for original blocks. Some line modifications may be necessary.

Learn more about how adjustable proportioning valves work by reading our tech article. Brake System Selection.  



MFG. Part #
BrandSpeedway Motors
Proportioning Valve TypeKnob Adjustable
Port Quantity4-Port
Material TypeAluminum
Brake System TypeDisc/Drum
Proportioning Valve LocationFrame Mount
Thread Pitch3/8"-24 IFF
Pressure Safety Switch IncludedYes
Overall Length4.00"
Overall Width1.00"
Overall Height1.75"
Sold in QuantityEach