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Question:

Is there a difference between power brakes and anti-lock brakes?

If so is there anything special about power brakes, or do most new cars have power brakes anyway?Thx.

Answer:

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Hi. All new cars have power brakes. Power brakes is used to describe the process in which the braking system of your vehicle, or more directly, the brake pads inside your wheels receive mechanically amplified pressure with respect to the pressure you are applying to the brake pedal in your vehicle. All mass produced cars made in the last 25 - 30 years have this capability. Anti-lock brakes describes an additional feature to power brakes. Non-anti-lock braking systems have the potential to lock-up, meaning to apply such pressure to the brakes that the tires stop moving completely and the vehicle path is at the mercy of friction between the tire and the road. Anti-lock brakes reduce the potential for lock-up by sensing when the pressure you are applying to the brakes is about to cause a lock-up and pump the brakes. Pumping the brakes used to be done manually with your foot, but in anti-lock systems, the pumping is done by the braking system at many times a second. By doing this, the brakes are being appliied forcefully enough to stop the car but the brake force is pulsed in such a way that when a lockup is about to occurr, the brakes are released and automatically reapplied. This process feels like a vibration in the brake pedal and sounds like a rapid clacking noise. Hope this helps you. Good luck
Two totally different systems. Power assist brakes would be a better name. It is a system, powered either off the power steering pump or vacuum assisted, that helps with the pressure on the brake pedal so you don't have to stomp really hard on it to get the car to stop. Anti-lock is a system that keeps the vehicle in a straight line during a panic stop. It monitors the wheels, and releases pressure on the wheel if it locks up and quits turning. It's locked up wheels that will put you in a spin, so it keeps things in a straight line and allows you to keep steering control, and stops you in the shortest possible distance. It uses a computer to essentially pump the brakes, when it engages you will feel some vibration in the brake pedal.
Almost all new cars have power brakes. When brakes are not power-assisted, the brake pedal feels very heavy and it takes longer to stop. Anti-lock braking systems enhance power brakes by preventing the wheels from skidding. If you have power brakes and you make an emergency stop, the wheels can lock up and the car will keep moving forward. If you have anti-lock brakes and you make an emergency stop, there are sensors that detect if a wheel is skidding. When a wheel starts to skid, the anti-lock system will engage the brakes on and off repeatedly. This is what is called pumping the brakes. In driver's ed, they teach that if a car without anti-lock brakes starts to skid, the driver should pump the brakes to stop in a shorter distance. The benefit of anti-lock brakes is that the system basically pumps the brakes for you. You can tell when anti-lock brakes are working because the brake pedal will usually vibrate (but not all cars have that feature). To sum this all up, if you have power brakes and you skid, pump the brakes to prevent the wheels from spinning. If you have anti-lock brakes, simply press the brake pedal and hold it down until the car stops. Anti-lock brakes are safer because the car stops in a very short distance. Hope this was helpful and not too confusing.

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