Q: T/F action uses the stopping power of one shoe to help increase the application force of the other shoe. Centrifugal Cen

asked by on

The residual check valve maintains between 20 and 60 psi in the brake lines.

True

False

Residual check valves hold pressure from 2-15 psi and can be used in both disc and drum brake systems. This is an average of course. A manufacturer might have a reason to increase this, but 2-15 is the norm. It sounds as though you are enquiring about a drum brake system. In this case, the residual check valve is meant to hold pressure on the seals in the wheel cylinders to keep them seals. If this wasn’t done, the seals would relax and brake fluid would seep past and leak.

As for how the shoes of a drum brake system create stopping force, you are partially on the right track. The exception is centrifugal force is the outward force applied to an object moving from the center line of the spinning object. It is true brake shoes are inside a spinning drum and there is certainly some centrifugal energy at play, but centrifugal force does not help the shoes apply braking force. The spinning of the drum applies a lever or wedging affect to the two shoes. The primary shoe tends to be the shoe that experiences the most force when this occurs. The primary shoe is always mounted toward the front of the vehicle.

It’s important to note, there are more than one type of drum brake system, which I won’t go into here. Other systems don’t use both shoes acting on each other to produce a wedging effect. They work more independently of each other.

You asked for a true or false answer. To which my answer is, as soon as I say false, there will be a car or situation that is true and vice versa. When I work on a car, the ideas and decisions made are about that specific car. Manufacturers are always trying new things and as soon as you decide something is absolute, your going to find yourself having a hard time wrapping your head around something that doesn’t fit with your ridged idea of what should be.

Good luck!

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. T/F action uses the stopping power of one shoe to help increase the application force of the other shoe. Centrifugal Cen

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: What do I do if the gas pedal on my truck gets stuck?

In case of an emergency, your truck is equipped with a Brake Over Accelerator feature. This feature allows you to stop the car if the gas pedal gets stuck. To use the Brake Over Accelerator feature. Steadily press the...

Q: My 2010 Ford Escape vibrates a lot. There are no leaks at all. What could be the cause?

If the vibration happens when you're stopped at a red light, then it's more than likely caused by a vacuum leak, or fuel or ignition system component failure. Typically, the first three parts that would be inspected are the idle...

Q: Hi thanks for this chance. Based on auto indicator I took my car for service. I had to pay $586

In my opinion, I don't believe that you were cheated. These seem like fairly standard prices for those services. If you would like a point of comparison, you can enter your vehicle information and the same services into our estimator...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.