If I add disc brakes will I need a proportioning valve?
Yes
. The addition of a proportioning valve is a must. Without it your braking system will not operate properly.
Do I have to use a proportioning valve?
A Proportioning valve is
required on vehicles that have disc brakes on the front wheels and drum brakes on the rear wheels
. … Having the rear brakes engage first provides the control and stability needed to stop your vehicle safety. The proportioning valve reduces the pressure to the rear brakes.
Can I bypass brake proportioning valve?
The
valve will only work as designed
if the rest of the suspension retains the original specifications – if your car is significantly lowered or the suspension stiffened up, you might as well bypass the proportioning valve.
Which brake system is the proportioning valve used for?
The proportioning valve typically connects the master cylinder to the rest of the braking system, but sometimes it is independent of the cylinder. This valve is necessary for
optimizing front-to-rear bias
, also referred to as brake balance.
Why is it necessary to install a metering valve on front disc and rear drum brakes?
For your disc / drum brake system, a metering valve is essential for proper balance. A metering valve
will control fluid flow from the master cylinder causing the rear drum brakes to engage
just before the front disc brakes. This allows the car to settle evenly under braking instead of nose diving.
How do you reset a brake proportioning valve?
- Locate the brake proportioning valve near the rear brake line. It will have one or two buttons located on it. …
- Push the reset button located on the valve with your fingers, which will reset it so the valve is working properly again. Inspect the brake pressure.
How do I know if my proportioning valve is bad?
Since the proportioning valve decreases the pressure sent to the rear brakes, the main symptom the valve is going bad is
the rear wheels locking up when the brakes are applied
. Furthermore, the wheels will lock up more easily on wet surfaces. The rear brakes may feel touchy when applied even gently.
What happens when a brake proportioning valve fails?
A faulty brake proportioning valve could
increase your vehicle's braking distance
, as it might reduce the pressure from the rear brakes too much. Note that the symptoms of a bad brake proportioning valve may also point to damage to other components, such as the rear brake circuit, brake caliper, or wheel cylinder.
How do you test a brake proportioning valve?
Pressure gauges
are the best way to diagnose a failed proportioning valve. There will be a gage installed into the front and rear hydraulic circuits. Start the vehicle, and apply the brake pedal with heavy pedal pressure to duplicate a panic braking situation. The front and rear pressures should be different.
Does the metering valve control the rear brakes?
A metering valve
will control fluid flow from the master cylinder
causing the rear drum brakes to engage just before the front disc brakes. This allows the car to settle evenly under braking instead of nose diving.
How do you install a brake proportioning valve?
The best place to put the proportioning valve is
adjacent to the master cylinder where it is easily accessible
. Once the valve is in place, you should first test to ensure that all air is bled out of the hydraulic system.
How do you adjust a load sensing proportioning valve?
Use light pedal pressure, and as an extra precau- tion,
move the lever to Position 7 (lever-type)
, or rotate adjusting knob in a clockwise direction (screw-type), to reduce internal pressure. The proportioning valve can be used to reduce brake line pressure, but will not increase it.
How do you use a brake proportioning valve tool?
Designed for use with CPP proportioning valves, these tools
lock the valve in place
and keep it from tripping when bleeding your brakes. You simply remove the warning light switch (white plug) on the valve and screw in the tool while bleeding your brakes. After the process is finished replace the warning light switch.
