Bill Smith
Founder, 1929-2014
Speedy Bill
Since 1952
Speedway Motors Logo
America's Oldest Speed Shop ®

Search

Canadian Leaf

Adjustable Proportioning Blocks With Brake Light Switch

SAME DAY SHIPPING! Order within the next 2 hours 28 minutes and receive same day shipping

Specs
Material Type:
Aluminum
Overall Height:
1.75
Overall Width:
1.00
Overall Length:
4.00
Sold in Quantity:
Each
Finish:
-
Inlet fitting:
3/8"-24
Outlet Fitting:
3/8"-24
Garage Sale:
No
Notes
Includes two adapter fittings (7/16"-24) and (5) 3/8"-24 brake line nuts.
Adjustable Proportioning Blocks With Brake Light SwitchAdjustable Proportioning Blocks With Brake Light SwitchAdjustable Proportioning Blocks With Brake Light SwitchAdjustable Proportioning Blocks With Brake Light SwitchAdjustable Proportioning Blocks With Brake Light Switch
Adjustable Proportioning Blocks With Brake Light Switch

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.

Speeday Motors Logo
X
Adjustable Proportioning Blocks With Brake Light Switch

Details

Reviews

Q & A

What's in the Box

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)

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

Notes

  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)

You may also be interested in:

Wilwood 260-11179 Adjustable Proportioning Block
                        

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.   

Dual Outlet Master Cylinder Stainless Steel Dual Brake Line Kit
                        

This is a pair of steel or stainless steel brake lines intended to simplify plumbing from the master cylinder to a proportioning block, such as our 910-31358 or 835-26011179.

  • Features tight 90° bends at the master cylinder end
  • Both ends of both lines are 3/8"-24 inverted flare nuts
  • The longer of the two lines measures app. 12" from the bend to the end
Dual Outlet Master Cylinder Steel Dual Brake Line Kit
                        

This is a pair of steel or stainless steel brake lines intended to simplify plumbing from the master cylinder to a proportioning block, such as our 910-31358 or 835-26011179.

  • Features tight 90° bends at the master cylinder end
  • Both ends of both lines are 3/8"-24 inverted flare nuts
  • The longer of the two lines measures app. 12" from the bend to the end