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Speedway Purple Proportioning Valve

Specs
Material Type:
Aluminum
Sold in Quantity:
Each
Finish:
Anodized
Outlet Fitting:
1/8" NPT
Centerline of Holes:
1.00
Overall Width:
1.25
Overall Length:
4.25
Overall Thickness:
1.64
Notes
Includes (2) 1/8" NPT to 3/8"-24 IFF adapters.
Speedway Purple Proportioning Valve
Speedway Purple Proportioning Valve
Speedway Purple Proportioning Valve
VIDEO
Speedway Purple Proportioning Valve

Click image to enlarge

Details

Reviews (26)

Q & A (9)

What's in the Box

Info

Allows easy adjustment of front-to-rear brake bias. Universal design works on all race cars. Has a 100 to 1500 psi range with up to 57 percent pressure reduction.

Includes two 1/8"-27 NPT to 3/8"-24 inverted flare fittings.

Brake System Builder's Tip (Link) 

Customer Reviews

Rated 4.8 out of 5 by 26 reviewers.
RATING BREAKDOWN
26 reviews
5 Stars
22
4 Stars
4
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

Toy
Verified Purchaser
Grand Island Ne

rear brake adjustments.

November 16, 2016
Rear brake adjustability to give me the the pedal feel and 4 wheel brake bias that I like.
Yes, I recommend this product.
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Oscar
Verified Purchaser
SF South Dakota

Works great

October 23, 2016
Quality product
Yes, I recommend this product.
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Tyler
Verified Purchaser
Verified Reviewer
Enid OK

Product works as good as it looks!

October 09, 2016
I use this product for front brake adjustment for my mini sprint. Product is easy to use and install
Yes, I recommend this product.
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Don
Verified Purchaser
Verified Reviewer
Guthrie, Okla.

Looks Great

August 06, 2016
Looks nice and the finish is great. Its a shame to put it where I have to as it will be hard to see it.
Yes, I recommend this product.
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Billpac
Verified Purchaser
Verified Reviewer
St Louis

Works as advertized

May 30, 2016
I tried to do without a prop valve on my recent T-bucket build, but found I needed it. This was priced right and easy to install. Works great!
Pros:
  • Good Fit And Finish
  • Easy Install
Yes, I recommend this product.
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big o
Verified Purchaser
bowling green oh

works great

April 17, 2016
works just like it says
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Mike
Verified Purchaser
Satellite Beach, FL

Speedway Purple Proportioning Valve

March 13, 2016
No complaints
Pros:
  • Easily Adjusted
Yes, I recommend this product.
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Mike
Verified Purchaser
Verified Reviewer
Satellite Beach, FL

Speedway Purple Proportioning Valve

March 13, 2016
Good quality
Yes, I recommend this product.
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Charlie
Verified Purchaser
Clayton,NC

Great product and a good value.I bought 2!

March 05, 2016
One of my cars did not have a proportioning valve on it.It is a custom build not built by me. By adding 2 i was able to solve the braking issues.
Yes, I recommend this product.
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Racey
Verified Purchaser
Verified Reviewer
Mo.Valley, Iowa

Quality part

March 01, 2016
Good product works like expected
Yes, I recommend this product.
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Page 1 of 3

Product Q&A

9 questions : 13 answers

1 answers

Running a proportioning valve My master cylinder is mounted on the fire wall the high point of my braking system. Do I still need to run a proportioning valve when changing from front drum to disc brakes? Do I need to run the pressure residual valves also?

leeslakehouse
lakehead
January 19, 2015

Running a proportioning valve My master cylinder is mounted on the fire wall the high point of my braking system. Do I still need to run a proportioning valve when changing from front drum to disc brakes? Do I need to run the pressure residual valves also?

Answers

January 20, 2015
EricM
Since your master cylinder is mounted up high you will not need residual valves. A proportioning valve such as this one should be used in the brake line going to the rear brakes so that you can reduce the amount of braking at the rear and have a balanced braking system. When adjusted correctly the car will stop straight (no fish tailing) and all four wheels will lock up at a similar time.
2 answers

Putting two proportioning valves in the brake system. Had the brake lines done by someone else and he recommended to put a valve in both front and rear brake lines. Was this a good idea or not? I see in your example only one in rear.

Odies27
Tucson, AZ
May 28, 2014

Putting two proportioning valves in the brake system. Had the brake lines done by someone else and he recommended to put a valve in both front and rear brake lines. Was this a good idea or not? I see in your example only one in rear.

Answers

April 26, 2016
Roy
From an engineers perspective, if the brake system is biased toward the front before installation of a proportioning valve and you only install a p/v in the rear circuit, then the p/v will only bias the front more. Installation in both circuits in this instance would be suitable to ensure the correct balance is achieved. Start with rear p/v full open and close down front p/v only as far as needed. [Ideally you don't want to reduce overall braking efficiency by reducing the front pressure more than is necessary]
May 29, 2014
EricM
There is no need, nor do we recommend installing a proportioning valve in the front line.
1 answers

Can I mount the valve in the cab of my truck (56 chevy) above the brake lines and master cylinder will the brakes bleed above the brake lins

rbo77
ohio
December 31, 2013

Can I mount the valve in the cab of my truck (56 chevy) above the brake lines and master cylinder will the brakes bleed above the brake lins

Answers

December 31, 2013
EricM
You can mount the proportioning valve higher than the master cylinder but it may be tougher to bleed the air out of the lines. In extreme cases you may need to add a bleeder at the highest point if you mount the valve considerably higher than the master cylinder or brake calipers/drums.
1 answers

Bleeding brakes with this valve? Any special procedure to bleeding brakes with this valve in the system? All the way open, all the way closed, or doesn't it matter?

smckelvey
MD
October 09, 2013

Bleeding brakes with this valve? Any special procedure to bleeding brakes with this valve in the system? All the way open, all the way closed, or doesn't it matter?

Answers

October 09, 2013
Jason
The Speedway proportioning valve is not a full shut off, only up to 57% pressure reduction. Brakes can be bleed with valve in any position but we have found it works best with knob screwed all the way in, this has valve free flowing without restriction of line pressure.
3 answers

do you install this valve before or after the stop light switch?

Flying Bum
Huntingtown, Md
December 14, 2011

do you install this valve before or after the stop light switch?

Answers

January 06, 2014
tweaty2
Install the valve after the stop light switch. That way you have full pressure to the switch.
September 27, 2013
dawg
after
December 15, 2011
John
Part number 91031353 Normally the stop light switch is installed close to the master cylinder but not a definite requirement. The proportioning valve can be installed before or after and in either case will still allow the switch to operate properly.
2 answers

Writing on the adjustment knob refers to "Less Brake", is this referring to the rear drum brakes ?

DrBee
February 07, 2011

Writing on the adjustment knob refers to "Less Brake", is this referring to the rear drum brakes ?

Answers

September 27, 2013
dawg
yes
February 10, 2011
Jason
Yes, turning counter clockwise will reduce line pressure.
1 answers

To get the proper pedal pressure I've also installed a 10psi residual pressure valve. Does it matter where in the line the residual pressure valve goes? Before the Proportioning valve or after? If this still doesn't provide enough pedal pressure-feedback, what else can be done?

Derek
November 07, 2015

To get the proper pedal pressure I've also installed a 10psi residual pressure valve. Does it matter where in the line the residual pressure valve goes? Before the Proportioning valve or after? If this still doesn't provide enough pedal pressure-feedback, what else can be done?

Answers

November 10, 2015
Zach
Expert
You can install this valve wherever it fits the best. Keep in mind this is not going to change the pedal feel, it is only going to change the amount of pressure delivered to the rear brakes.
1 answers

Is this valve factory set to the proper setting or do I use trial and error to determine the correct setting?

Nubie
September 15, 2016

Is this valve factory set to the proper setting or do I use trial and error to determine the correct setting?

Answers

September 15, 2016
Craig
Expert
The Speedway purple adjustable proportioning valve is a universal piece and is not factory set. It is adjustable so you can make it work with any brake system on any vehicle.
1 answers

Does the included fittings need any type of sealer when being installed into the proportioning valve?

Mike
Cooper, TX
November 30, 2016

Does the included fittings need any type of sealer when being installed into the proportioning valve?

Answers

December 02, 2016
Eric
Expert
The included NPT to inverted flare adapters will be needed if you are using a steel brake line with 3/8"-24 inverted flare nuts. We suggest a TFE sealer such as 1011009904 be used on the pipe thread connection which is the proportioning valve to adapter connection. The inverted flare line does not need any sealer.
Page 1 of 1

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