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GM Disc/Drum Proportioning Valve for 3/8-24 Outlets

SAME DAY SHIPPING! Order within the next 13 minutes and receive same day shipping

Specs
Sold in Quantity:
Kit
Finish:
Natural
Material Type:
Brass
Outlet Fitting:
Bottom front/Top front are 3/8"-24 IFF (to font brakes), Rearmost port is 9/16"-18 IFF (to rear brakes).
Centerline of Holes:
2.69
Overall Height:
2.00
Overall Width:
1.08
Overall Length:
5.13
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.
GM Disc/Drum Proportioning Valve for 3/8-24 Outlets
VIDEO
GM Disc/Drum Proportioning Valve for 3/8-24 Outlets

Click image to enlarge

Watch the video below to learn more about the differences in brake lines, flare types and fittings you may want to consider before plumbing away on your current chassis project.

Details

Reviews (4)

Q & A (7)

What's in the Box

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 3/8"-24 outlets.

910-31364 Instructions (PDF)

Item Details

For M/C with 3/8"-24 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

Customer Reviews

Rated 4.8 out of 5 by 4 reviewers.
RATING BREAKDOWN
4 reviews
5 Stars
3
4 Stars
1
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

stupesnova
Verified Purchaser
Verified Reviewer
Sun Prairie, wi

GM proportioning valve

August 17, 2015
finish is excellent
Yes, I recommend this product.
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kaputafj
Verified Purchaser

76 GMC 1/2 ton

November 01, 2014
quick shipment, works just fine. installed easily.
Yes, I recommend this product.
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Dway
Verified Purchaser
British Columbia, Canada

This product was well machined and mount

May 14, 2014
The product was delivered on time and was as described in the catalog. The installation well quickly with the valve body mounting right into the original OEM location and required no modification to existing brake lines. Good product
Yes, I recommend this product.
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Blt 2 Run
Verified Purchaser
West Palm Beach, Fl

Solved my problem

August 02, 2012
I needed to install it on the opposite side of the master cyl. and had to bend the bracket and one line in the other direction, an option of where it will be mounted would give the customer a choice of hardware. Thanks Jack
Yes, I recommend this product.
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Page 1 of 1

Product Q&A

7 questions : 8 answers

2 answers

What brake line line size is supported on the rear brake port? Thank you for the information for M/C and front brake line size. What rear brake line size is supported? PDF diagram does not show brake line size, only tube nut size.

jcostan
March 28, 2014

What brake line line size is supported on the rear brake port? Thank you for the information for M/C and front brake line size. What rear brake line size is supported? PDF diagram does not show brake line size, only tube nut size.

Answers

May 15, 2014
Dway
The rear brake port is 1/2 in requiring a 9/16 wrench
March 31, 2014
EricM
The original GM applications used 1/4" line to the rear brakes. If you would like to use a 3/16" brake line to connect to the rear brake port of this proportioning valve then you will need adapter part number 9103183-9/16.
1 answers

what brake line size is supported? Are all ports on this product for 3/16 brake tube size? I understand the difference in the tube nut sizes, but I need to confirm a 3/16" inverted flair line will fit in the front and rear ports to the MC, front line brake ports and rear brake port.

jcostan
March 27, 2014

what brake line size is supported? Are all ports on this product for 3/16 brake tube size? I understand the difference in the tube nut sizes, but I need to confirm a 3/16" inverted flair line will fit in the front and rear ports to the MC, front line brake ports and rear brake port.

Answers

March 28, 2014
EricM
The small end of the lines from the valve to the master cylinder are for the 3/16 line with the thread nuts in 3/8 x 24. The opposite end of the lines connect to the valve with the ½ x 20 to the front brakes and 7/16 x 24 for the rear. There are two outlets on the valve for the front brakes and exiting the valve in 3/8x24 which is the standard fir 3/16” line. The outlet for the rear brakes is 9/16x18 and if you want use 3/16 line adapter 9103183-9/16 will be needed. A photo of the valve with fitting sizes labeled is shown in the instructions here: http://static.speedwaymotors.com/pdf/910-31351%20MBM%20prop%20valve.pdf
1 answers

What proportioning valve do I have? I am trying to figure out the brake system on the car I got and I'm wondering if I have a disk disk proportioning valve on a disk Drum car. The number on the back of the proportioning valve is hj 8 087 9419. Any idea what this is?

Capedbandit
Az
March 12, 2014

What proportioning valve do I have? I am trying to figure out the brake system on the car I got and I'm wondering if I have a disk disk proportioning valve on a disk Drum car. The number on the back of the proportioning valve is hj 8 087 9419. Any idea what this is?

Answers

March 13, 2014
EricM
We apologize but the number you referenced does not match any of our suppliers numbers and is likely to be a batch or run number. If it has a brand on it you may try the nearest supplier for that particular brand for possible cross over on his computer system. If you have a disc/disc valve on a drum brake car the rear wheels will have a tendency to lock up prematurely especially on hard or emergency braking.
1 answers

I bought a brake booster combo, part #91031409, and installed on a "95 S-10 frame with disc front, drum rear. Is this proportioning valve compatible? Rat Rod

Marvin
Forest Lake, MN, USA
October 01, 2013

I bought a brake booster combo, part #91031409, and installed on a "95 S-10 frame with disc front, drum rear. Is this proportioning valve compatible? Rat Rod

Answers

October 01, 2013
Jason
This proportioning valve is intended for vehicles having front DISC brakes and rear DRUM brakes. It includes hardlines that connect the proportioning valve to a master cylinder that has 3/8" outlets. This is a 'combination' valve. It incorporates metering (for the front brakes) and proportioning (for the rear brakes)into one valve. This valve does *NOT* contain built in residual valves.
1 answers

where is the 3/8 outlet on this is it for the rear brakes?

scott
ca
August 23, 2011

where is the 3/8 outlet on this is it for the rear brakes?

Answers

August 23, 2011
Jason
"This valve is intended for vehicles having front DISC brakes and rear DRUM brakes. It includes hardlines that connect the proportioning valve to a master cylinder that has 3/8" outlets." ************************************** This is a 'combination' valve. It incorporates metering (for the front brakes) and proportioning (for the rear brakes)into one valve. This valve does *NOT* contain built in residual valves. ADDIT INFO: THE BOTTOM FRONT PORT HAS 3/8"-24 IFF THREADS AND GOES TO ONE FRONT BRAKE. THE TOP FRONT PORT HAS 3/8"-24 IFF THREADS AND GOES TO ONE FRONT BRAKE. THE MIDDLE TOP PORT HAS 1/2"-20 IFF THREADS AND COMES FROM THE MASTER CYLINDER. THE REAR TOP PORT HAS 7/16"-24 IFF THREADS AND COMES FROM THE MASTER
1 answers

Is there a way to hook up a brake light to this valve?

jenks
douglas, NE
February 05, 2016

Is there a way to hook up a brake light to this valve?

Answers

February 05, 2016
Zach
Expert
No a brake pressure switch would have to be ran on one of the lines with a T fitting
1 answers

Could a brake light be screwed into one of the ports that runs to one of the front brakes? Then the line that runs to one of the front brakes have a a tee put into that line and a line run to the other front brake?

jenks
douglas, NE
March 30, 2016

Could a brake light be screwed into one of the ports that runs to one of the front brakes? Then the line that runs to one of the front brakes have a a tee put into that line and a line run to the other front brake?

Answers

March 31, 2016
Eric
Expert
Yes that is certainly an option with this proportioning valve.
Page 1 of 1

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