Ask the Expert

Question:

I just bought a new car and it has ABS brakes. What can you tell me about how they work?

Answer:

Anti-lock brakes can be a big help in coming to a stop. They prevent wheels from locking up and can reduce stopping distance on slippery surfaces. Wheel lock-ups occur when the braking force applied by the driver is more than the tire can handle. This creates vehicle instability and does not allow for steering around road hazards. Tire damage can also result from wheel lock-ups, as locked wheels on dry roads can quickly create flat spots on tires.

A typical anti-lock brake system is composed of a central electronic unit, four speed sensors (one for each wheel), and two or more hydraulic valves on the brake circuit. The electronic unit constantly monitors the rotation speed of each wheel. When it senses that any numbers of wheels are rotating considerably slower than the others (a condition that will bring it to lock) it moves the valves to decrease the pressure on the braking circuit, effectively reducing the braking force on that wheel. The wheel(s) then turn faster and when they turn to fast, the force is reapplied. This process is repeated continuously, and this causes the characteristic pulsing sound or feel through the brake pedal. A typical anti-lock system can apply and release braking pressure up to 20 times per second.

You need to always be aware, however, that anti-lock brakes can not overcome the laws of physics and should not be overestimated. When the anti-lock brakes activate, consider this as a sign that you need to slow down and perhaps allow your self more stopping distance between your vehicle and those in front of you. Anti-lock brakes are an important safety feature, that when combined with safe driving habits, increase your chances of getting to where you want to go safely!

If you have more questions please feel free to contact me at phil@PhilsProAutoService.com

This Month's Savings Coupons

Daylight savings time means it's wiper blade time

Take a Winter Brake