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$64.99
GM Disc/Drum Proportioning Valve for 1/2-20, 9/16-18 Outlets
GM Disc/Drum Proportioning Valve for 1/2-20, 9/16-18 Outlets

GM Disc/Drum Proportioning Valve for 1/2-20, 9/16-18 Outlets

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GM Disc/Drum Proportioning Valve for 1/2-20, 9/16-18 Outlets
GM Disc/Drum Proportioning Valve for 1/2-20, 9/16-18 Outlets
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Part # 91031351
$64.99
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  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.

Details

Material Type:
Brass
Overall Length:
5.15"
Overall Width:
1.08"
Overall Height:
1.95"
Overall Thickness:
1.08"
Centerline of Holes:
2.68"
Sold in Quantity:
Each

Info

These proportioning valves are similar to what GM used on many cars in the 70s. They are non-adjustable and may require an adjustable valve in the rear brakes (if needed). Block incorporates metering (for front brakes) and proportioning (for rear brakes) into one unit. For use with front disc, rear drum brake systems.

Includes hard lines to connect to a master cylinder with 1/2"-20 and 9/16"-18 outlets.

GM Proportioning Valve Plumbing Instructions (PDF)

Item Details

For M/C with 1/2"-20 and 9/16"-18 outlets.

Notes

Bottom Front Port: 3/8"-24 IFF threads - goes to one front brake
Top Front Port: 3/8"-24 IFF threads - goes to one front brake
Middle Top Port: 1/2"-20 IFF threads - comes from master cylinder
Rear Top Port: 7/16"-24 IFF threads - comes from the master cylinder
Rear Most Port: 9/16"-18 IFF threads - goes to rear brakes

Specs


Outlet Fitting

Bottom front/Top front are 3/8"-24 IFF (to font brakes), Rearmost port is 9/16"-18 IFF (to rear brakes).

Notes

Includes hard lines with fittings, hardware, bracket, and brake light switch. This is a combo valve (metering for front/proportioning for rear) into one valve. Residual valves NOT built in.
Some parts are not legal for use in California or other states with similar laws/regulations

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Videos & Articles

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    Anytime you purchase a new master cylinder, it's important to remove all the air before installing it. Here is a very helpful video tutorial that will show you how to bench bleed a new master cylinder.
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  • by
    Having trouble stopping your vehicle? Speedway Motors has assembled a very useful guide to help diagnose common brake issues and show you step-by-step how to bleed your brakes.
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  • by
    Sometimes manually bleeding your brakes isn't the best option for you. In this case you can also take a look at our guide on how to gravity bleed the brake system.
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