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Adjustable Proportioning Blocks With Brake Light Switch

Price: $69.99 - $99.99
ADJUSTABLE PROPORTIONING BLOCK
Item #:
91031358
 
(5 Ratings)
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  • Adjustable Proportioning Blocks With Brake Light Switch
  • Adjustable Proportioning Blocks With Brake Light Switch
  • Adjustable Proportioning Blocks With Brake Light Switch
  • Adjustable Proportioning Blocks With Brake Light Switch
  • Adjustable Proportioning Blocks With Brake Light Switch
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.

 

This adjustable proportioning block allows you to run lines from the master cylinder to the block and then to the appropriate wheels. What is neat about it is that it also contains the proportioning valve and brake light switch. This dramatically reduces the amount of fittings needed and potential leaks.

The adjustable proportioning valve regulates rear brake pressure, helping to maintain correct brake bias between front and rear brakes. It is designed for dual bowl master cylinders. The distribution block connects to the master cylinder and distributes brake fluid to all four wheels. An easy to turn handle with directional arrows makes it simple to either increase or decrease rear brake pressure.

The block accepts 3/16" brake lines and the inlets and outlets on this unit are 3/8"-24 inverted flare females.  It has two inlets from the master cylinder, two outlets to the front brakes and one outlet to the rear brakes.  It includes five stainless steel 3/16" fittings and wiring pigtail for rear brake light switch. Mounts to any convenient location. This is not a direct factory replacement for original blocks. Some line modifications may be necessary.

910-31358 Instructions (PDF)

  1. The brake block is plumbed as follows. The port on the proportioning valve end is the "out" line for the rear brakes. The port between th proportioning valve and brake light switch is the "in" line for the rear brakes. The port in front of the brake light switch is the "in" line for the front brakes. The port on the brake light switch end is the "out" line to the passenger front brake while the port on the bottom is the "out" line to the driver front brake.
  2. This block has individual lines for the front wheels and each line would require a residual valve if the master cylinder is mounted under the floor on the frame rail. 2 psi for each front if it has disc brakes and 10 psi for drum brakes. It still will require a residual valve to the rear with the same psi, depending on the brake type used.
  3. Brake System Builder's Tip (Link)
Reviews for Item #: 91031358
REVIEWED BY 5 CUSTOMERS
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[ 1 of 1 customers found this review helpful ]
 

Excellent product!

By 1965 F350 from Fairfield Ca. on 3/16/2010
Pros:
Great price
Cons:
none
Bottom Line: Yes, I would recommend this to a friend

Very easy hookup. Also mounts to stock GM proportioning valve bracket, an added plus for a clean installation.

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Works as it should

By Wayne from New Mexico on 9/1/2010
Pros:
Best price by far, High Quality Product
Bottom Line: Yes, I would recommend this to a friend

very good quality product that works as it should.

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VERY NICE

By FORDSRULE from NW, WEST COAST on 2/26/2011
Pros:
Easy To Install, Lightweight
Car & Truck:
Auto Enthusiast, Mechanic
Best Uses:
Everyday Driving, Performance Driving
Bottom Line: Yes, I would recommend this to a friend

THE SAME AS THE OTHERS BUT HALF THE PRICE

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I'm color blind?

By Angry Hot Rod Builder from Indiana on 7/12/2011
Pros:
Easy To Install
Cons:
Difficult To Install

There I was,putting a hot rod together,wiring the brake lights. Line 3C states orange wire.Line C4 states white wire. In the picture and on the part,it's red and black. Some one is paying close attention to details.

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Cheap switch

By RACSAN Racing from San Antonio on 8/25/2011
Bottom Line: No, I would not recommend this to a friend

Electrical tab broke off the pressure switch as soon as I got it out of the box. For a part this expensive it blows my mine there is not a threaded terminals for the pressure switch.

Customer Service Response

Speedway Customer Service sent this customer a replacement switch via express delivery to replace the faulty unit.

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Questions and Answers for Item #: 91031358

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4 Questions | 4 Answers
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Q:

must you run two brake lines to the front ?

Asked on 3/16/2011 5:24:05 PM by Jason from Carleton Michigan

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Q:

will this work with four wheel drum brakes?

Asked on 6/27/2011 4:51:49 AM by troy from franklin,tn

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Q:

will this valve work if mounted on its side.

Asked on 10/18/2011 11:18:49 AM by from

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Q:

I plumb from the master cylinder directly to this block, after the block, do I still add a 2 PSI residual valve to the front disc brakes and a 10 PSI to the rear drum brakes for my 32 roadster? The master cylinder is located beneath the floor.

Asked on 10/31/2011 5:17:35 PM by Jason from Satsop, WA

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