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Compact Adjustable Proportioning Valve

SAME DAY SHIPPING! Order within the next 8 hours 7 minutes and receive same day shipping

Specs
Sold in Quantity:
Each
Material Type:
Brass
Outlet Fitting:
1/8" NPT
Garage Sale:
No
Overall Height:
1.68
Overall Width:
.63
Overall Length:
2.00
Notes
Can also be used as a shut-off valve.
Compact Adjustable Proportioning Valve
Product Video
Compact Adjustable 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

Very compact, can be hidden in cars that do not allow adjustable proportioning valves. Color reference scale on valve stem allows fast, accurate setting. Installs in rear brake line and allows you to adjust front-to-rear brake bias to prevent rear brake lock-up under heavy braking. 

  • Can be used as full shut-off valve
  • Rated to 2000 psi
  • Flows 3 gpm
  • Inlet:  1/8" NPT port
  • Outlet:  1/8" NPT port

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

Notes

  1. Brake System Builder's Tip (Link)
  2. Valve is marked "MC" for the master cylinder end (fluid in) and "BR" for the brake end (fluid out).

Customer Reviews

Rated 4.4 out of 5 by 11 reviewers.
RATING BREAKDOWN
11 reviews
5 Stars
8
4 Stars
1
3 Stars
1
2 Stars
0
1 Star
1
RECOMMEND THIS PRODUCT:

Strathmore streek
Verified Purchaser
Porterville ca

Love this valve I have used several a and non work as we'll

August 14, 2015
Last longer then any one I've used , dosnt get clogged .
Yes, I recommend this product.
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smiley
Verified Purchaser
Verified Reviewer
somewhere in connecticut

should of come with some sort of directions for setting

May 15, 2015
doing its job
Pros:
  • Good Compact Valve
Cons:
  • No directions
Yes, I recommend this product.
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dave
Verified Purchaser
fairhaven ma.

this product is of great quailty

May 15, 2015
I used this product in my midget race car.it is compact and works very well.
Yes, I recommend this product.
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willb
Verified Purchaser
Bozeman, MT, USA

Solid

February 08, 2015
Good quality. Worked as advertised. Installed on my 23 T bucket. I will definitely be using this in the future again. Cheers.
Yes, I recommend this product.
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Barrett57
Verified Purchaser
Ardmore, OK 73401, USA

Simple But Effective

September 23, 2014
This was very easy to install by splitting my rear line and installing a couple 1/4" flare nuts. Also very easy to use, simply turn the brass knob to increase or decrease flow to the rear brakes. Only complaint is that it doesn't come with any instructions or guidance as to how much flow is restricted by each turn of the knob. Went to the manufacturers website to get further info.
Pros:
  • cheap simple alternative to proportioning valve
  • well made easy to install
Cons:
  • no instructions or charts to indicate flow rates
Yes, I recommend this product.
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Bucksss12
Verified Purchaser
Livermore, ca.

well made product. I,ve used them before

August 24, 2014
Small enough to fit in anywhere. I found it easy to install in my 49 Studebaker.
Yes, I recommend this product.
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Rusted
Tacoma, WA, USA

Great valve, great size and good value

October 07, 2013
I have now used Wilwood, CPP and others. I am confident in saying that this little valve is fantastic and it will be the only one that I use from now on. I have had this little thing in my personal hotrod for 4+ years, 1000s of miles and hard use with no problems. It does what it is supposed to - gives a full range of modulation, and the fittings are easy and not prone to leaking. The size is great and the price is good. Use it. It did take a little longer to find that happy medium but now it is good to go.
Pros:
  • not leaky
  • modulation
  • Size
  • great for burnouts
Cons:
  • A little pricy
Yes, I recommend this product.
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KDsbc406

Small but Mighty !

September 26, 2013
I did a rear disc brake conversion on 81 Elco valve works great to even out braking pressures.
Yes, I recommend this product.
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plasticcarsrock91
Illinois, USA

Great Product and Good Price

September 03, 2013
Bought this for a 1990 f150 with a 5.8L windsor(built some), and a heavy duty E4OD trans(built some), with a modded rear end with 3.88's, i mainly use to do straight line racing with, and specifically needed a line lock of sorts for burnout competitions. most of them were running any place from 65 to 160 bucks for anything of the sorts. with this i simply took a line connector out, bent the lines slightly up to make the gap wider, and using 2 of the recommended reducers for thread pitch, not the 90's that are in the recommended but the other option, installed it all, bled brakes quickly, clamped it down to close it off completely, backed out, went out and did a test hit, and roasted both rear tires no problem while the fronts kept me in place. Cheap, but well made, and i'm very happy with it. no instructions, but none needed, open box, snag two reducers that you buy with it, get line wrenches, tighten those down on the valve, get more line wrenches, break loose the lines on the vehicle, look to see which end is marked "towards master cylinder, and towards calipers" or "flow" with an arrow, i forgot which way this was marked, install on car. bleed brakes, set to desired tightness, and let it be. am planning on making a box to keep debris from burnouts and the track off of it, as it's tucked up to the frame rail near the rear leaf springs, and with illinois roads, salt, and old man winter, i'm not sure if this might stop functioning. better be safe than sorry. so far very happy. definitely snag it for a weekend track/burnout warrior.
Pros:
  • well made it's very heavy
  • small but does job perfect
  • cheapest option out there
Yes, I recommend this product.
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bud
Verified Purchaser
clearwater

no paper work to tell how it works

July 02, 2011
just need to have some paper work to tell you how it works
Pros:
  • Lightweight
No, I would not recommend this product.
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Page 1 of 2

Product Q&A

6 questions : 11 answers

1 answers

What is the best way to mount this? Is there some sort of bracket?

racinhonduh
January 20, 2015

What is the best way to mount this? Is there some sort of bracket?

Answers

January 20, 2015
EricM
The best/easiest way to mount this would be to use insulated line clamps such as 91031312 on the brake line before and after the valve. That way the valve is held in place nicely. It is a very small valve and does not weigh much so mounting the valve solid to the frame isn't necessary.
2 answers

I just recieved this valve and Im curious of why theres a "B" and "R" scribed on one end and a "M" and "C" scribed on the other end? what are these?

rrocketryan
July 09, 2014

I just recieved this valve and Im curious of why theres a "B" and "R" scribed on one end and a "M" and "C" scribed on the other end? what are these?

Answers

August 25, 2014
Bucksss12
MC means that end is plumbed to the master cylinder, the BR faces to the rear brake circuit.
July 09, 2014
EricM
You will need to connect the line coming from the master cylinder to the end with MC. Connect the line that goes to the brake caliper to the end with BR.
2 answers

As you adjust this down to restrict the fluid flow going TO the brakes will it cause the lines to HOLD pressure as fluid flows back THROUGH?

rrocketryan
June 11, 2014

As you adjust this down to restrict the fluid flow going TO the brakes will it cause the lines to HOLD pressure as fluid flows back THROUGH?

Answers

August 25, 2014
Bucksss12
this valve will restrict flow and pressure to the rear brake circuit when adjusted from the zero starting point. you need to have the front circuit do 60 percent of the braking.
June 12, 2014
EricM
No it will not hold pressure in the rear brake lines. This valve will allow the fluid to flow back toward the master cylinder to prevent the rear brakes from dragging.
2 answers

will this lock out back brake pressur totally for burnouts? thanks will this lock out back brake pressur totally for burnouts? thanks

balls
md
August 06, 2013

will this lock out back brake pressur totally for burnouts? thanks will this lock out back brake pressur totally for burnouts? thanks

Answers

September 04, 2013
plasticcarsrock91
Yes definitely. used it at 2 different burnout competitions with the pickup and it did spectacular. got asked how i was keeping the truck so steady in the burnout box...this was it. had several guys ask for a link or a name afterwards.
August 06, 2013
Jason
Yes, this compact adjustable proportioning valve can be used as a full shut-off valve
2 answers

what does this valve do and do I need it?

May 23, 2011

what does this valve do and do I need it?

Answers

September 04, 2013
plasticcarsrock91
If you are racing on a road course, and need that extra tune-ability, this can give that, my letting you set the car better in a sharp turn under braking, as it lets you change your braking bias front to rear, or depending on the setup of how you ran the brake lines, side to side... Also dead useful if you're into doing burnout competitions like i am. keeps the rear wheels spinning free as can be while my foot's planted on both pedals, and the front wheels are locked in place keeping me in the burnout box. for a normal daily driver, no you don't "need" it so to speak. if you have side hobbies that include pushing vehicles a little further than they should, yes, it's dirt cheap compared to the other styles of proportioning/cut off valves for brakes, and is a great little setup. small, heavy as all get out for its size(which normally means well made), and very down to the point. no flashy things or useless bells and whistles. it does its job, and does it very well. color coded to levels of braking bias too.
May 25, 2011
John
Our compact proportioning valve is designed to be installed in the brake line from the master cylinder to the rear brakes. Commonly used on most brake applications to limit the pressure going to the rear brakes during severe braking. During the braking process the weight transfers to the front of the vehicle tending to lighten the rear of the vehicle and allowing premature lock up of the rear wheels. By limiting the pressure from the rear to the front the valve can be adjusted so all 4 wheels will lock up at the same time for better braking. Disc brakes also require 1200-1300 psi as opposed to the 600-800 psi requirement of the drum brake wheel cylinders.
2 answers

What is a good point to preset this valve to start out?

April 29, 2011

What is a good point to preset this valve to start out?

Answers

August 25, 2014
Bucksss12
start at #2. Ideally you need brake pressure gages on one front and one rear brake. once gages are in place, apply the brakes and adjust the valve until there is a 200 to 250 PSI difference between the two The highest pressure should be read on the front circuit.
May 02, 2011
Jason
The setting would depend on what you are trying to accomplish as far as front to rear percentage. I would set on # 5 or about half way and try to fine tune from there.
Page 1 of 1

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