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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
5
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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
8 months ago
29essex
Sioux Falls, SD
Verified
Good results. Clean install. Disc/drum combo
Would Recommend
Upgrade to old rig
5.0
9 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
12 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
a year 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
2 years ago
Bronson
Arkansas
Verified
Same as original part.
Would Recommend
I would recommend this product
5.0
2 years 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
Questions & Answers
17 Questions • 11 Answers
Questions & Answers
17 Questions • 11 Answers
I bought your disc brake conversion kit for my 1969 Chevy Nova. I got this prop valve, 91031351, and only 1 of my existing front lines has a fitting that fits. The other is too big and the rear is too small. Also, my front lines are stainless and I don't want to mess with trying to bend and flare them with new fittings. Do you sell lines(original material, I don't want stainless again) with the correct fittings that will fit this prop valve?
by Mike
• 7 years ago
1 answer
View Answer
Hello, I did a drum to disc conversion on my GM X body. I am having difficulty getting any pedal pressure. Lines, hardware and entire brake system new. The only deviation was mounting the proportioning valve sideways under the MC to mimic the factory look. Can this unit be mounted sideways?
by Revinkevin
• 8 years ago
1 answer
View Answer
Quick question. I installed this along with a speedway 12 circuit harness. The porpotioning valve has a one wire switch. The speedway harness has two wires. A brake switch power (orange) and a brake switch (white). I'm having trouble figuring this out. Any help would be greatly appreciated.
by Jamie
• 8 years ago
2 answers
View Answers
Are their any specific tricks or tips for bleeding a disk/drum setup with this proportioning valve? I have a tried multiple new Master Cylinders and still have a soft pedal after bleeding the heck out of the lines. I'm thinking it may be related to this proportioning valve...
by somnater
• 9 years ago
1 answer
View Answer
Regarding combo valve PVK71, It's been established there is no residual valve contained in the unit. I have a disc/drum setup and want to use a residual valve for the rear drums. Is this PVK71 unit compatible with a residual valve? Is a 10# residual valve too much residual pressure? How loose would I initally adjust the rear shoes (drum/shoes are new) Thanks!
by Stan
• 10 years ago
1 answer
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Does this product have a built in 10 psi residual pressure system for rear drum brakes?
by Matt
• 10 years ago
1 answer
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What size line and adapter do I use for the rear brakes port? Nothing I've tried seems to work. Part numbers would be great.
by Gabe
• 12 years ago
1 answer
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do i have to use both port for the front brakes or can i block one off and it still work for me? my father and I rebuilt a 1956 dodge pickup and we are using a chevy manual dual master cylinder. front disk and rear stock drum brakes. can I use this part and block off one of the front ports and it still work the same or do you carry something that will work better for me.
by Levasseur2
• 12 years ago
1 answer
View Answer
Master Cylinder to valve line size The instructions for this valve say line size to be 1/4 inch. The lines that came with my valve are smaller than 1/4 inch. They do attach ok to my master cylinder with 1/2 and 9/16 fittings but tube is small. Is this a problem?
by txstude
• 12 years ago
1 answer
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Where do I get the 1/4" line 3/8-24 thread fitting? I read the instructions, which direct you to use 1/4" lines. I can't for the life of me find a 3/8-24 fitting of any kind for use with 1/4" line, though. 7-16 all day long, 9/16 sometimes, 1/2 yeah that too... 3/8? In 1/4? Doesn't seem to exist. So, where do I get the fittings for this beast - or are the instructions in error?
by yossarian19
• 13 years ago
1 answer
View Answer
10 of 17 questions shown