Inline Tube - Proportional Valve Installation Instructions
valves provide four functions:
- Proportion correct pressure to the front and rear
- Provide 10psi residual pressure in the brake
Is a metering valve to apply pressure to the rear
brakes before the front brakes.
- Has a brake warning light to detect a loss in
In some cases,
the right front line will be plugged at the proportioning valve and the left
front line will go to a "T" fitting. From the "T" fitting,
the front lines then split off and go to the left and right front wheels.
valve has a dashboard warning light switch built-in (this is not a stop light
switch). The warning light will indicate any loss of pressure, for example, a
leaky wheel cylinder. We recommend you wire this light into your system. Any two-wire light socket will work. One wire goes to the accessory power and the other
goes to the warning light.
proportioning valves have a knob that allows you to set the intensity of the
rear braking action. This valve can be added into the rear line(s) anywhere you
choose. Once fitted with lines bled completely, the optimal setting can be
determined one quarter turn at a time.
When replacing a
proportioning valve with a duplicate, compare the two valves for similar
mounting holes, port configuration, and warning light connection. Then mount and
fit the lines as was previously done. When replacing an existing proportioning
valve with a different design, you need to consider the other elements in the
braking system such as separate blocks and/or correction valves. Typically the
new proportioning valve replaces all of these elements, which is why these
contemporary valves are also called combination valves. This means that these
other elements in the system that were part of the original set-up are now
replaced by the one new proportioning valve. This situation is specifically for
original disc brake cars from 1967 to 1970. In 1971 and newer, the combination
proportioning valve was used from the factory. Replacing a multiple valve and
block system results in different brake lines and routing.
If you are converting to front disc from an original drum car, you will be
adding a proportioning valve to the system for the first time. The key to
success for a disc conversion is to plan ahead and walk through your entire
installation prior to turning wrenches. Where you mount the valve you can greatly
impact the brake lines and will be available for the conversion. The adjustable valve is
covered above; the pre-set combination valve is now our concern. To facilitate
most brake line conversion kits and provide clearance for headers and large
valve covers, the proportioning valve will be mounted at the master cylinder.
Inline Tube provides proportioning valve mounting brackets that use one of the
master cylinder mounting bolts to place the valve next to or under the master
cylinder. Our conversion line kits are designed for this popular application.
The further you choose to “customize” your installation, the less available
bolt-on parts will be. This means that you will have to alter provided
components or fabricate your own solutions. In general, Inline Tube provides
lines for either factory original or prop at master conversions.
Consult your mechanic
This page is
intended for use as a basic guide to help install new brake and fuel lines. If
you are unsure about any part of the installation procedure, please consult a
certified professional mechanic for assistance. Inline Tube assumes no
responsibility or liability for improperly installed lines.
Quick Tip: Installation
Valve Installation - Refer
to the disassembly photos. There are many holes in the frame and it is
impossible to remember which are the correct holes for mounting. If
you do not have photos, many parts retailers and Inline Tube sell factory assembly manuals that
show in detail where each of the parts are located on the car. The manuals are
available for cars such as Camaro, Chevelle, Nova and Corvette through Inline Tube.
Inline Tube - Brake & Fuel Lines
15066 Technology Drive
Shelby Twp, MI 48315