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#91031351
GM Disc/Drum Proportioning Valve for 1/2-20, 9/16-18 Outlets
- This non-adjustable proportioning valve is similar to 70's GM valves and provide OEM appearance
- This block incorporates metering for front brakes and proportioning for rear brakes into one unit
- For use with disc front and drum rear brake systems
$107.99
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Product Summary
Universal Fit, Disc/Drum Brake System Type, Brass
- This non-adjustable proportioning valve is similar to 70's GM valves and provide OEM appearance
- This block incorporates metering for front brakes and proportioning for rear brakes into one unit
- For use with disc front and drum rear brake systems
- Hard lines are included to connect to a master cylinder with 1/2"-20 and 9/16"-18 outlets
- Two 3/8"-24 IFF outlets for the front brakes and one 9/16"-18 IFF outlet for the rear brakes
Key Specs
| Proportioning Valve Type | Fixed |
| Port Quantity | 3-Port |
| Material Type | Brass |
| Finish | Natural |
| Color | Natural |
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Speedway Motors 91031351 Details
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.
Item Details
For M/C with 1/2"-20 and 9/16"-18 outlets.
Bottom Front Port: 3/8 "-24 IFF threads - goes to one front brakeTop 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 brakesBottom 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
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Speedway Motors 91031351 Specifications
Speedway Motors 91031351 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91031351 |
| Brand | Speedway Motors |
| Proportioning Valve Type | Fixed |
| Port Quantity | 3-Port |
| Material Type | Brass |
| Finish | Natural |
| Color | Natural |
| GENERAL | |
| Brake System Type | Disc/Drum |
| Proportioning Valve Location | Left Mount |
| Thread Pitch | 3/8"-24 IFF | 9/16"-18 IFF |
| Outlet Fitting | Bottom front/Top front are 3/8"-24 IFF (to font brakes), Rearmost port is 9/16"-18 IFF (to rear brakes). |
| Pressure Safety Switch Included | Yes |
| Overall Length | 5.15" |
| Overall Width | 1.08" |
| Overall Height | 1.95" |
| Overall Thickness | 1.08" |
| Centerline of Holes | 2.68" |
| Notes | Includes hard lines with fittings, hardware, and bracket. This is a combo valve (metering for front/proportioning for rear) into one valve. Residual valves NOT built in. |
| Sold in Quantity | Each |
Ratings & Reviews
4.8
48 Reviews
Customers commend the product for its high-quality material, perfect fit, and ease of installation. The product seems to be an effective direct replacement for corresponding original parts, especially for older car models such as '78 K10 and '56 ford. It consistently exhibits no leaks, enhancing its practicality. The kit includes almost every requirement for setup, and coupled with excellent instructions and the inclusion of necessary hardware, it simplifies the installation process. Compared to other products, customers find our part superior in functionality and professionalism. However, concerns were raised about defects in the product causing inconvenience. Still, its successful application in brake system conversions, disc/drum brakes, and brake rebuilding outshines its counterparts, making it a go-to choice for most customers.
Ratings & Reviews
4.8
48 Reviews
Customers commend the product for its high-quality material, perfect fit, and ease of installation. The product seems to be an effective direct replacement for corresponding original parts, especially for older car models such as '78 K10 and '56 ford. It consistently exhibits no leaks, enhancing its practicality. The kit includes almost every requirement for setup, and coupled with excellent instructions and the inclusion of necessary hardware, it simplifies the installation process. Compared to other products, customers find our part superior in functionality and professionalism. However, concerns were raised about defects in the product causing inconvenience. Still, its successful application in brake system conversions, disc/drum brakes, and brake rebuilding outshines its counterparts, making it a go-to choice for most customers.
4.8
48 reviews
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Most Liked Positive Review
5.0
Perfect Product, even better customer service!
In the process of doing a drum to disk conversion on my 66 GTO, I needed a proportioning valve and being a novice at this, I didn't know the different in/out fitting sizings. The large parts company I ordered from was no help, but the Speed Way rep was great and walked me through what I needed and how it all connects.
Most Liked Negative Review
1.0
Don't buy this product!
This product was defective and did not work for the application it was sold for. Speedway's service department keep saying there was nothing wrong. I spent lots of hours trying to make it work. I spent lots of money at a repair shop to get it working. He had to replace the parts with ones that work from a different supplier. Speedway used to sell quality products. It seems like now all they care about is Cheap. I will never buy from Speedway again.
Filter by Ratings
Works good. Clean looking
5.0
a month ago
29essex
Sioux Falls, SD
Verified
Good results. Clean install. Disc/drum combo
Would Recommend
Upgrade to old rig
5.0
3 months ago
Southern Champion Garage
Flomaton, AL
Verified
Upgraded my 63' C10 for better braking! Everything worked as described…check us out on YouTube for install #SouthernChampionGarage
Would Recommend
I would buy this again.
5.0
5 months ago
Happy Life
Virginia
Verified
This worked and fit perfectly in my car so I now have great brake pressure to both my front and rear brakes.
Would Recommend
GM disc/ drum prop valve
5.0
11 months ago
Desertcamaro
Phoenix, Az
Verified
I haven't put it in the car yet but it is a great quality part from what I see.
Would Recommend
I would buy this again.
5.0
a year ago
None
Brownwood, Texas.
Verified
Converted 58 Belair to power disk brakes.
Would Recommend
I would buy again.
4.0
a year ago
Bronson
Arkansas
Verified
Same as original part.
Would Recommend
I would recommend this product
5.0
a year ago
Triple t
Winnipeg Canada
Verified
Fits perfectly
Would Recommend
Second one of these I have installed
5.0
2 years ago
Bill
Wichita, Ks
Verified
The fit and finish are really good.
Would Recommend
Great quality
5.0
3 years ago
Larry
North Dakota
Verified
Direct replacement for OEM
Would Recommend
Speedway Motors. Top service, top product.
5.0
3 years ago
Monza Bob
Christchurch New Zealand
Verified
Great to deal with. Parts are first class. Thanks Bob
Would Recommend
Showing 10 of 48 reviews