ALWAYS SECURE
America's Oldest Speed Shop ® 800.979.0122 Lincoln, NE
Filters
Menu
Contact
Help Center
x
x
How to Contact Us

U.S.Order Line:

800.979.0122

(CST) 7am - 10pm

Race and Rod Tech Support

Mon-Fri 8am - 5pm

Canadian Order Line:

855.313.9180

International Order Line:

1.402.323.3200
Since 1952
Menu
x

Speedway Purple Proportioning Valve

SAME DAY SHIPPING! Order within the next 16 hours 20 minutes and receive same day shipping

Specs
Centerline of Holes:
1.00
Material Type:
Aluminum
Overall Width:
1.25
Overall Length:
4.25
Sold in Quantity:
Each
Overall Thickness:
1.64
Finish:
Anodized
Outlet Fitting:
1/8" NPT
Garage Sale:
No
Notes
Includes (2) 1/8" NPT to 3/8"-24 IFF adapters.
Speedway Purple Proportioning Valve
Speedway Purple Proportioning Valve
Speedway Purple Proportioning Valve
Product Video
Speedway Purple Proportioning Valve

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

Q & A

What's in the Box

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 4.9 out of 5 by 10 reviewers.
RATING BREAKDOWN
10 reviews
5 Stars
9
4 Stars
1
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

Kdorfner
Verified Purchaser
Verified Reviewer
DeBary, Fl.

A must have

May 31, 2015
I use this on my cars when installing disc/drum brakes to keep the rears from locking up before the fronts. I have used this valve on a few cars I have built without a problem.
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

henry23t
Sunnyvale Ca. USA

speedway proportioning valve

October 01, 2014
if you add a 4 way dish brake system on your car. then you will need a adjustable proportioning valve like the speedway proportioning valve. or changing a front drum to a dish brake. thenn you will need it..
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

ford84stepside
Berry, AL 35546, USA

Seems to do the trick

July 19, 2014
Installed easy, seems to do what it's supposed to do.
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

tweaty2
Citrus Heights, CA, USA

Great product at a Speedway great price.

January 05, 2014
I have used the Speedway proportioning valve on over a dozen streetrod brake systems. Easy installation and adjustment.
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

tweaty2
Citrus Heights, CA, USA

Great product at a Speedway great price.

January 05, 2014
I have used the Speedway proportioning valve on over a dozen streetrod brake systems. Easy installation and adjustment.
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

Gerard

Great Quality!

October 01, 2013
Top notch quality and less expensive than the similar Wilwood prop valve!
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

dawg
Honey Brook, PA 19344, USA

great product

September 26, 2013
i got one for my tbucket it worked just how they said it would in the product discription and was very easy to install
Pros:
  • Easy To Install
Cons:
  • None
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

Modelacruzer
Verified Purchaser
Porterville, CA

Looks to be a quality piece.

June 20, 2012
Easy brake adjustment with little effort.
Pros:
  • Easy To Install
  • Lightweight
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

JT
Verified Purchaser
Northport NY

Well made and did the job at 25% less $

February 27, 2011
Easy install
Pros:
  • Lightweight
  • Easy To Install
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

Dave
Madison, SD

Great product!!!

March 15, 2010
Works great and very reasonably priced!
Yes, I recommend this product.
Full Size Image

Was this review helpful? 0 0

Page 1 of 1

Product Q&A

6 questions : 9 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.
1 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

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.
Page 1 of 1

You may also be interested in:

Wilwood 260-8420 Lever Style Proportioning Valve
(Part #8352608420)
                        

This proportioning valve has six preset adjustment points actuated by moving a lever allowing racers to adjust brake bias during a race without having to "look" where the knob position is. This lever "clicks" into the six positions for positive adjustment and the bright red lever is easily seen in a busy racing cockpit. Lever can be rotated 180 degrees for easy installation.

  • This ratchet style brake proportioning valve allows quick and accurate adjustment of brake bias
  • Universal design works on all race cars
  • 100 to 1500 psi range, up to 57% pressure reduction
  • It comes with 6 preset positions, has an aluminum body, rapid ratchet, and positive lock
  • Uses 1/8" NPT fittings

835-2608420 Instructions (PDF)

Wilwood 260-8419 Knob Style Proportioning Valve
(Part #8352608419)
                        

This device lets you adjust the front-to-rear braking balance by proportionally decreasing the rear (or in some cases the front) brake line pressure. Can also be used to adjust individual front wheel braking in dirt track applications. Valve weighs only 5.2 ounces and has two .25" side mounting holes spaced 1.00" apart.

  • Allows easy adjustment of front to rear brake bias
  • Universal design works on all race cars
  • 100 to 1500 psi range, up to 57% pressure reduction
  • Accepts 1/8"-27 NPT fittings

Compensates for weight transfer to the front wheels during braking. All factory brake systems allow for this in some fashion. An APV allows you to "fine tune" a street or race brake system and thus prevents severe rear brake lockup under moderate-to-heavy braking.

835-2608419 Instructions (PDF)

Speedway Polished Proportioning Valve
(Part #91031354)
                        

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)

Wilwood 260-11179 Adjustable Proportioning Block
(Part #83526011179)
                        

This block has the proportioning valve built-in to the rear brake ports and a stop light switch built into the front brake ports. All ports are 3/8"-24 inverted flare female.

  • Compact design simplifies mounting, plumbing, & wiring
  • Maintains full isolation between front and rear fluid circuits
  • Rear circuit has a single inlet and single outlet with the adjustable proportioning valve
  • Front circuit has a single inlet with two outlets

Proportioning Valve Installation Instructions (PDF)

Brake System Builder's Tip (Link)

Detailed Schematic of Proportioning Block 

Learn more about how adjustable proportioning valves work by reading our tech article. Brake System Selection.   

Straight -3 AN Male to 1/8 NPT Male Adapter Fitting
(Part #6174244)
                        

Brake Adaptor.

  • 1/8" NPT

 

Wilwood 290-0632 570 Brake Fluid, 12 oz Bottle
(Part #8352900632)
                        

Wilwood's specially formulated Hi-Temp 570° Racing Brake Fluid has a minimum 570 degree dry boiling point to withstand the severe heat requirements of automotive racing. Hi-Temp 570's low viscosity allows easy bleeding of your brake system, eliminating aeration of the brake fluid caused by foaming due to excessive pumping of the pedal. 

This high temp brake fluid comes in a convenient 12 ounce container hermetically sealed to guarantee against unwanted absorption of moisture which can drastically lower the fluids boiling point (fluid from larger containers tends to become contaminated with moisture, lowering its boiling point and making it unsuitable for racing applications). 

  • Dry Boiling Point:  573° F
  • Wet Boiling Point:  313° F

8352900632 Instructions (PDF)

AFCO 6691903 Ultra HTX 600+ Brake Fluid, 16.9 oz.
(Part #1066691903)
                        

If you are using a parts store brake fluid, you are not getting the most from your brake system. AFCO Ultra HTX racing brake fluid is specifically formulated for racing under the most demanding conditions. Ultra HTX's high wet and dry boiling points give you maximum protection against vapor lock and other problems associated with high brake system temperatures. With a 600+ degree boiling point, Ultra HTX high temp brake fluid sets a new standard for brake fluid performance.

  • Specifically formulated for racing
  • High wet and dry boiling points
  • 600+ degree dry boiling point
  • Exceeds D.O.T. 3, 4 and 5.1 requirements
  • Virtually elminates vapor lock
  • Non-silicone