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Nevada driving lesson · Freeway Driving & Stopping

Anti-lock brakes (ABS)

A 3-minute lesson from the Nevada course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.

Read time
3 minutes
Course unit
Freeway Driving & Stopping
Checkpoint questions
4
Source pages
40, 57

Anti-lock brakes keep your wheels from locking in a hard stop so you can still steer. The technique is the opposite of what many drivers learned: with four-wheel ABS you press hard and hold — you don't pump.

ABS

Anti-lock braking system: prevents skidding and lets you steer in emergency braking. When wheels start to lock, it pumps the brakes automatically, much faster than a driver could.

Handbook p. 40 ↗

Know the rule

To find out if you have ABS: look for the ABS symbol lighting on the dashboard right after you start the engine, check the owner's manual, or ask the dealer.

Handbook p. 40 ↗

Know the rule

If the ABS symbol stays lit long after starting, the ABS isn't working. Your conventional brakes still work — use traditional emergency braking.

Handbook p. 40 ↗

Know the rule

Four-wheel ABS: push the brake pedal down hard, hold it down firmly, and steer where you want the car to go.

Handbook p. 40 ↗

During an ABS stop:

  • Don't turn the wheel hard or jerk it — you could end up in the emergency lane or on the shoulder
  • Keep control by steering where you want to go
  • Check that traffic is clear where you decide to steer
  • Steer back into your original lane as soon as the hazard is cleared
Handbook p. 40 ↗

Know the rule

Rear-wheel ABS (found only on some light trucks) keeps the back end from skidding sideways, but the front wheels can still lock. If they do, let up on the brake just enough for them to roll and regain steering.

Handbook p. 40 ↗

Know the rule

Removing steady pressure from the pedal, or pumping the brakes, disengages ("turns off") the ABS.

Handbook p. 40 ↗

Know the rule

On snow and ice, gentle touch-and-release braking works without ABS; with ABS, use firm, continuous pressure.

Handbook p. 57 ↗

Put it into practice

A deer leaps into the road and you brake hard in your car with four-wheel ABS. Keep pressing firmly, steer around the deer into clear space, and return to your lane once you're past. Pumping would switch the ABS off.

Check your understanding

Read the question, decide on an answer, then open it to check the explanation. These are Roadwise study questions based on the source handbook.

When four-wheel ABS engages in an emergency stop, what should the driver do?
  1. Push the brake pedal down hard, hold it, and steer
  2. Pump the brake pedal rapidly
  3. Release the brake completely and coast
  4. Turn the steering wheel hard in one direction

Answer: Push the brake pedal down hard, hold it, and steer

With four-wheel ABS, brake hard, hold it down firmly, and steer where you want to go.

Handbook p. 40 ↗
If your vehicle has rear-wheel ABS only and the front wheels lock up, what should you do?
  1. Press the brake pedal down harder
  2. Let up on the brake to regain steering
  3. Pump the emergency brake
  4. Pump the brake pedal quickly

Answer: Let up on the brake to regain steering

Let up on the brake just enough to let the front wheels roll again and regain steering control.

Handbook p. 40 ↗
The ABS symbol on your dashboard stays lit long after you start the engine. What does this mean?
  1. The ABS is working normally
  2. ABS is off; normal brakes still work
  3. All of your brakes have failed
  4. You must pump the brakes to reset it

Answer: ABS is off; normal brakes still work

If the ABS light stays on long after starting, ABS isn't working, but conventional brakes continue to work.

Handbook p. 40 ↗
Pumping the brake pedal in a car with ABS can disengage, or turn off, the anti-lock feature.
  1. True
  2. False

Answer: True

Removing steady pressure from the brake pedal or pumping the brakes will disengage the ABS.

Handbook p. 40 ↗
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