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Adjustable Proportioning Blocks With Brake Light Switch

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#91031358

Adjustable Proportioning Blocks With Brake Light Switch

Name: Adjustable Proportioning Blocks With Brake Light Switch
Brand: Speedway Motors
SKU: 91031358
Rating: 4.5 (68 reviews)

68 Reviews

15 Questions

This adjustable proportioning block serves several purposes which dramatically reduces the amount of fittings needed and reduces the potential for leaks
Dual front brake line outlets eliminates the need for a T fitting for the front brakes
Built in pressure switch allows you to conveniently operate your brake lights

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$119.99

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Product Summary

Universal Fit, Disc/Drum Brake System Type, Aluminum

This adjustable proportioning block serves several purposes which dramatically reduces the amount of fittings needed and reduces the potential for leaks
Dual front brake line outlets eliminates the need for a T fitting for the front brakes
Built in pressure switch allows you to conveniently operate your brake lights
3/8"-24 inverted flare female inlets and outlets allow the use of common 3/16" brake lines for a quick nand easy installation
Five stainless steel 3/8"-24 flare nuts and a wiring pigtail for the brake light switch are included making this a value that can't be beat

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Key Specs

Proportioning Valve Type	Knob Adjustable
Port Quantity	4-Port
Material Type	Aluminum
Finish	Select Finish
Color	Select Finish

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Need To Know

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855.313.9176

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Installation Details

Proportioning Valves Installation Instructions (91031358)

Residual vs Proportioning Valves and What Your Brake System Needs

Proportioning Valves Installation Instructions (91031358)

Installation Tips

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.
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.
Brake System Builder's Tip (Link)

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Details

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.

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

Charts

910-31358 Instructions (PDF)

Guides & Documents

Proportioning Valves Installation Instructions (91031358)

Residual vs Proportioning Valves and What Your Brake System Needs

Proportioning Valves Installation Instructions (91031358)

CA Prop 65

Specifications

KEY SPECS
MFG. Part #	Select Finish to see
Brand	Speedway Motors
Proportioning Valve Type	Knob Adjustable
Port Quantity	4-Port
Material Type	Aluminum
Finish	Select Finish to see
Color	Select Finish to see

GENERAL
Brake System Type	Disc/Drum
Proportioning Valve Location	Frame Mount
Thread Pitch	3/8"-24 IFF
Pressure Safety Switch Included	Yes
Overall Length	4.00"
Overall Width	1.00"
Overall Height	1.75"
Notes	Select Finish to see
Sold in Quantity	Each

Ratings & Reviews

4.5

68 Reviews

Overall Assessment

Based on the reviews, customers are generally satisfied with the product's quality and functionality. They laud its straightforward installation, compact design, adjustability, and compatibility with both disc and drum brake systems across a range of vehicle models. However, some encountered issues with leaking pressure switch. Despite that, many found it to be a valuable addition to custom or vintage vehicles, applauding its advantage in regulating brake pressure over the competitors. Most customers recommend the product for its performance, convenience, and affordability.

Write A Review

4.5

68 reviews

Most Liked Positive Review

4.0

Great product!

A nice little all-in-one proportioning valve block. Has a great finish(I went with black) and mounting holes. I made a mounting bracket out of diamond plate aluminum. My only complaint, and it's not that serious, is having to remove the stop light switch to connect the "In" line from the rear brake chamber. I didn't want to remove it.

Most Liked Negative Review

1.0

Adjustable Block with Brake light switch...

When I first saw this switch online I thought just what I need at a good price. The install was OK but while using good fittings, I have had a leak at almost every outlet including the brake switch. I had to remove the whole block after it was installed because of all the leaks. That thing couldn't hold fluid under pressure without leaking in almost every outlet. In examining the block, I believe the machining just is not up to spec. I had to dangerously over torque each fitting just to get it to stop leaking. I'm still dealing with at least 1-2 more slight leaks. I cant torque the fittings anymore as I worry about stripping the aluminum. I'm not sure what is best. I received the block and let it sit on the shelf a while before the install since I'm completing a restore on my Dodge A100. I don't think I would be eligible for an exchange or upgrade. I see the pic in this ad shows it with CPP markings. The one I received has no markings. I'm not sure if they sent me a different brand or it's still CPP just not marked. If anyone from Speedway reads these reviews, please advise. The item is installed but the vehicle not driven as I still have not been able to stop the leaks.

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Very nice looking produc6

5.0

5 months ago

Gene Barrette

Cedar Rapids Iowa

Verified

Very nice looking product

Would Recommend

Great product!

4.0

8 months ago

Jaymon74

Small town, Indiana

Verified

Would Recommend

I would buy this part again.

5.0

a year ago

Verified

Used on a 1951 ford panel truck.

Would Recommend

Yes

5.0

a year ago

Dan

Bristol conuty

Verified

Great part for my car

Would Recommend

Proportioning valve

5.0

a year ago

Oldschool2

Verified

Purchased for my Roadster, haven't used it yet. Looking to be of good quality.

Would Recommend

Yes

5.0

a year ago

Wen

Martinsville Ind.

All good

Would Recommend

just what I needed

5.0

2 years ago

Doc

Morris county, NJ

Verified

direct fit but haven't tried it yet, no instructions

Would Recommend

I would buy this product again.

5.0

2 years ago

Cobra S

Kyle, Tx

Verified

Great for adjusting Disc/Drum bias.

Would Recommend

I would buy again

5.0

3 years ago

Kevin

Texas

Verified

Great part to install brake system from scratch. Easy to mount and to connect brake line's. Has several options for connecting front brake lines.

Would Recommend

A+

5.0

4 years ago

FLORIDA

Verified

A+

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Showing 10 of 68 reviews

Questions & Answers

15 Questions • 11 Answers

Sort Questions

What size thread is used for the brake light switch

by Zack

• a year ago

1 answer

View Answer

I must be missing something or the pic isn't of the correct unit. I assume the 2 holes in the side are for mounting as they don't appear to be threaded. The port on the end with the switch is stamped FO which I assume means front out. The port on the other end I assume is rear out. 2 ports on top are from the master cylinder, right? By my count there is only one front out not 2 and one rear out. I actually would prefer this. Sorry if I'm missing something.

by bmralt

• 9 years ago

1 answer

View Answer

I installed this prop valve on my braking system. I got the master connected directly to it and the residual valves after the prop. I'm trying it out and either if the adjustment is all the way in or all the way out, it doesn't seam to make any difference. My rear wheels lock up. I double checked and my system is plumbed correctly. Could one see or feel a difference in the way the brakes are acting by adjusting the knob from fully out to fully in?

by LODAC

• 10 years ago

1 answer

View Answer

you answered my question about if the valve had some sort of shut off to rear brakes but not sure of the answer. when I put the spring and valve that goes under the adjustment knob in I can not get fluid to come out of the block. With spring and valve that goes under the adjustment knob installed turning the knob clockwise tightens pressure on the spring and counter clockwise takes pressure off spring. So are you saying I need to tighten down (clockwise) to get the valve to open so I can fluid to rear brakes?

by Bird dog

• 10 years ago

1 answer

View Answer

Does this valve have any type of internal shut off due to pressure loss to rear brakes. When I try to bleed brakes I cannot get any fluid out of the block. I can remove the spring and the part it goes against and then I can get fluid out.

by Bird dog

• 10 years ago

1 answer

View Answer

Can I use pt.no 910-31820 to plumb my brake line into this block and I'll be only using one front brake line port, so what's the pt.no of the plug that can be threaded into the block...Thanks

by Farmer

• 10 years ago

1 answer

View Answer

Do I have to run the front lines through this block? I just want to regulate the rear brakes. Will the pressure switch work if I don't connect the front ports? Most prop valves I've used in the past have just had a single inlet/outlet.

by Bud

• 11 years ago

1 answer

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can this valve be mountes upside down.. switch & adjustment knob pointed down?

by fitzwell

• 12 years ago

1 answer

View Answer

my front brakes are going to a tee to have one line go to the proportioning valve, can I block one hole on the valve to use just the one front line

by bugg

• 12 years ago

2 answers

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Wiring Diagram Can you please tell me how to route the 2 wires on the pigtail that came with it? I assume one is for a dedicated 12v fused line in and the other is to the brake lights out? I misplaced the diagram.

by bbl23T

• 12 years ago

1 answer

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