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Express Car Care of Denver

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Anti-Lock Brakes or Power Brakes – What’s The Difference?

November 29, 2020 by Denver Express Car Care

On the simplest of terms, brakes are easy to understand. When you apply brakes, they help slow you down. Keep applying pressure and eventually, you’ll come to a complete stop.

Everything in motion uses some type of braking system. You’ll find it on heavy machinery, airplanes, bicycles, and of course, cars.

Depending on how old your car is, and how familiar you are with automotive history, you might be familiar with two types of braking systems on a car: power brakes and anti-lock brakes. What’s the difference? Why does it matter? And is one more preferable over the other?

Before we dive into that, let’s look a little deeper into how the braking system works.

How brakes on today’s cars work

If you want to slow down or come to a stop, you apply pressure to the brake pedal, and it goes into action. But while you can feel the motion taking place, a lot more is going on than you can see.

The brake pedal is connected to a rod that connects to the vehicle’s master cylinder, which is then bolted to a firewall. If you have power brakes, this rod is first bolted to a vacuum booster, which is then connected to the firewall.Anti-Lock Brakes or Power Brakes - What’s The Difference?

This rod works as a piston inside the master cylinder. When the rod is pushed into place, it forces brake fluid through the lines. This creates action at the brake caliper level, which forces brake pads against the brake rotors, which slows the vehicle down. It’s the friction of this process, the connection between the brake pad and the brake rotor on the wheel that makes the vehicle slow down.

Understanding power brakes

If you went back in time, the braking process was rudimentary at best. Todays’ brakes are built around Pascal’s law of hydraulics, which is the law of fluids in motion and how they can be used to increase force. Pascal’s law states that when there is an increase in pressure at any point in confined fluid, there is an equal increase in pressure at every point inside the container.

That law has been transferred many times as the modern day braking system was designed and refined.

Power brakes were initially developed for heavy vehicles during WWII. It made this machinery easier to slow down and stop.

An engine naturally generates a great deal of vacuum. The concept of power brakes is designed to siphon off some of that power, and store it in a booster that is created to help with the braking process. By stepping on the brake pedal, this vacuum multiplies the effort your foot puts towards the pedal, making the entire braking process easier, with more power.

Vacuum boost power brakes became by far the most popular type of assisted brakes. That’s because it puts more power throughout the application of brake fluid, and less effort from the operator. It’s a simple system that’s reliable at the same time.

But of course, through invention and ingenuity, there is always room for improvement.

Understanding anti-lock brakes

Even as an experienced driver, there are times when your reaction speed doesn’t match the level of intensity you’re experiencing. You have to make split-decisions in order to keep your vehicle safe and on the road.

Accidents occur. And that made inventors go back to the drawing board, looking for ways to improve on the power brake system.

Even as an experienced driver, if something jumps out in front of you, or you face immediate danger, the natural reaction is to find yourself jumping on the brake pedal.

This is how anti-lock brakes, or ABS, were developed. It’s designed to prevent the wheels from locking up, which helps keep a grip on the road.

Anti-lock was first created for aircraft back in the 1950s. Sensors were used to monitor the rotational speed of each wheel, and send it in real time back to a processor. This processor controls a series of valves that meter the braking effort and force level used at each wheel. If one wheel slows down more than the others, or is on the verge of locking up and skidding, the processor reduces the hydraulic pressure in that brake line to stop the situation from happening. This works exceptionally well on wet pavement, where the car can go into a dangerous skid.

ABS reduces the risk of skidding even when you, the driver, faces excessive potential problems. Your instinct is to stop the car as quickly as possible, but with ABS, it judges how to do so safely given the current conditions. That is why it’s important to leave ample distance around you to allow ABS to do its job. Cars with ABS:

  • Are less likely to be in fatal accidents
  • Are less likely to have frontal collisions on wet or dry roads

That is why they are a standard feature on all of today’s vehicles.

Ensure your anti-lock brakes work through regular maintenance

Anti-lock brakes are designed to be there when you need them most. That means they require occasional maintenance to ensure they keep working their best.

One of the simplest steps you can take is by keeping your car clean. Brakes that are dirty, caked with oil and grime, can’t function how they were designed. Occasional washes are a good way to keep your car looking great and running equally as well.

You should also avoid overusing your anti-lock braking system. ABS isn’t something that was designed for daily use. The more aggressively you drive, the more chances you take while out on the road. Drive with care. Stay back from the vehicles in front of you so you have more time to react. Take extra care if the driving conditions change. Stay off the roads if you can avoid it in inclement weather.

You may also need to have the ABS speed sensors calibrated from time to time. Over time, they can become misaligned. One of our experienced mechanics can access the computer system at different speeds to reset and calibrate each sensor at each wheel. This should be done yearly, or any time you have maintenance work performed on your braking system. 

Filed Under: Brake Repair, Brake Service Tagged With: Anti-Lock Brakes, Power Brakes

A Guide To Anti-Lock Brakes

February 10, 2020 by Denver Express Car Care

If you’ve ever driven an older car, stomped on the brake pedal, trying to get the car to stop quickly, only to feel the cart slide and swerve, you know how scary it can be not to have full control over your vehicle. ABS – anti-lock braking system – is designed to give you more control in more situations.

The concept of anti-lock brakes actually started almost 100 years ago. Engineers were looking for an override system for aircraft, and ABS technology became the standard to prevent the wheels from sticking as the plane rapidly decelerated.

In the 1950s, ABS technology moved to motorcycles to improve safety and handling. And slowly, it was introduced into vehicles over the course of the next few decades. By the 1990s, anti-lock brakes were standard issue on most production line vehicles.

How do anti-lock brakes work?

A Guide To Anti-Lock BrakesLet’s talk a bit about how anti-lock brakes work. If you think back to your lessons in drivers ed, you might remember how they taught you to take control over your car if you hit a patch of ice. If the brakes won’t work and you slide, pump the brakes instead by pressing down on the brake pedal and letting go, over and over again. This helps your tires look for traction instead of continuing to slide.

That same concept explains how ABS is designed to work. If you suddenly want to come to a stop and apply a lot of pressure to fast-moving wheels, that intense pressure can cause your wheels to lockup. This will typically cause them to lose traction, and you’ll slide and skid uncontrollably.

ABS is designed to prevent this. Anti-lock brakes use sensors to determine the motion of your wheels. When you press down on the brake pedal, these sensors activate and monitor the wheel movement to determine the action. If it senses lockup, it turns on the ABS, which pumps your brakes instead of locking them up. The timing of it occurs with precision, thanks to technology, a vast improvement over what you could do simply by tapping your brake pedal over and over again.

Why are my anti-lock brakes coming on?

Your vehicle is technology-driven, with every part working together to keep you safe. Every new year brings new technology to light, meaning if you have the latest production car, technically, it will have the safest features on the market.

If you’ve ever stepped on your brake pedal and had the ABS turn on, you might have felt a vibration. Depending on your car, you may have a small dashboard light turn on as well, telling you your anti-lock brake system has been activated.

Based on road conditions, the vehicle’s technology has determined it needs ABS to keep the car safe. In some cases, the pulsing of the brake system may not stop the car as quickly as it normally does. But it has determined that this action is better to bring your car to a stop, and risk sliding or skidding out of control.

Where is the anti-lock brake?

The good news is most new cars on the road today have anti-lock brakes. If you’re driving an older car or truck and wish to determine if you have ABS, there are several ways you can go about it.

The easiest is to check your owner’s manual.

If you don’t have access to your owner’s manual, you can check your dashboard instrument panel. As you turn your car on, yet before you turn it to start, all lights will flash on. Think of this as “test” mode. If your car has ABS, it will be illuminated at this time. Look for a light that either says “anti-lock” or “ABS.”

If you have a basic understanding of the parts of the car, you can also pop the hood and take a look inside. The anti-lock brake pump will sit near the brake master cylinder, and be connected to several different lines.

The final way is to physically look at the setup of the wheel. You’ll have to get into position to be able to see the brakes on the front wheels. If your car has anti-lock brakes, you’ll see a flexible hose attached to the brake caliper, with a wire attached to a speed sensor in the hub of the wheel. This sensor will be missing if your car doesn’t have ABS.

How do you test anti-lock brakes?

The best way to ensure your anti-lock brakes are working is to check that the warning light illuminates on your dashboard during test mode every time you turn your vehicle on. If you don’t see the icon light up, it’s best to let your mechanic check it out and ensure everything is working correctly.

Likewise, if your ABS light turns on at any point while you’re driving your vehicle, schedule a maintenance visit as soon as possible to ensure your braking system is working the way it should.

How long do ABS controls last?

ABS is designed to work in all kinds of conditions, and be there for you no matter when you need it. It’s not something you turn on, or that you have to change out the fluid for on a regular basis. But like any other part, it can wear out over time.

As anti-lock brakes initiate, you’ll feel a slight pulsating mechanism underneath your foot. It clicks, and then it creates rise and fall in the system, which you can feel by having your foot on the brake pedal. This is known as the ABS control module.

The brakes are one of the essential systems in your vehicle. You use them every day, dozens of times, as you move in and out of traffic to accomplish all you do on your drive. The anti-lock brake system is separate from your brakes. That means even if the ABS fails, you’ll still have your braking system to rely on.

Under most conditions, ABS will last the life of your car. But because it is electronic, it can suffer from several things, including an electrical overload, or overheating due to high temperatures. If the ABS light comes on, one of our professional mechanics will replace the control panel.

Is your ABS working correctly? Is your braking system keeping you safe? We can ensure everything on your vehicle is working correctly, to ensure the safety of you and your family.

Filed Under: Brake Repair, Brake Service Tagged With: Anti-Lock Brakes

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4200 E. Evans Ave. Denver, CO (map)
Phone: (303) 691-2760
Located just southeast of the Colorado Light Rail station

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