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2.18.7 – Braking If ABS Is Not Working

  • Without ABS you still have normal brake functions. Drive and brake as you always have.
  • Vehicles with ABS have yellow malfunction lamps to tell you if something is not working.
  • As a system check on newer vehicles, the malfunction lamp comes on at start-up for a bulb check and then goes out quickly. On older systems, the lamp could stay on until you are driving over 5 mph.
  • If the lamp stays on after the bulb check or goes on once you are underway, you may have lost ABS control on one or more wheels.
  • Remember: If your ABS malfunctions, you still have regular brakes. Drive normally, but get the system serviced soon.

2.18.8 – Safety Reminders

  • ABS will not allow you to drive faster, follow more closely or drive less carefully.
  • ABS will not prevent power or turning skids. ABS should prevent brake-induced skids or jackknifes, but not those caused by spinning the drive wheels or going too fast in a turn.
  • ABS will not necessarily shorten the stopping distance. ABS will help maintain vehicle control, but not always shorten the stopping distance.
  • ABS will not increase or decrease ultimate stopping power. ABS is an “add-on” to your normal brakes, not a replacement for them.
  • ABS will not change the way you normally brake. Under normal brake conditions, your vehicle will stop as it always stopped. ABS only comes into play when a wheel would normally have locked up because of over braking.
  • ABS will not compensate for bad brakes or poor brake maintenance.
  • Remember: The best vehicle safety feature is still a safe driver.
  • Remember: Drive so you never need to use your ABS.
  • Remember: If you need it, ABS could help to prevent a serious crash.

Multiple-Choice Questions:

Question #167 (1 of 4)

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ABS will not change the way you normally brake. Under normal brake conditions, your vehicle will stop as it always stopped. ABS only comes into play when:

  • The load you're carrying is too heavy for the current driving conditions
  • A wheel would normally have locked up because of over braking.
  • The road is icy
  • The standard (traditional) brakes fail and ABS takes over
ABS will not change the way you normally brake. Under normal brake conditions, your vehicle will stop as it always stopped. ABS only comes into play when a wheel would normally have locked up because of over braking.
ABS tries to prevent any wheels from locking up during braking. That is its only real function. It does not increase braking power, nor does it necessarily shorten the braking distance. It just releases the brake on a wheel if that wheel locks up, then reapplies the brake once the wheel is spinning again.
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Question #165 (2 of 4)

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Which of the following are true about ABS?

  • ABS will not increase or decrease ultimate stopping power. ABS is an “add-on” to your normal brakes, not a replacement for them.
  • ABS will not necessarily shorten the stopping distance. ABS will help maintain vehicle control, but not always shorten the stopping distance.
  • ABS will not prevent power or turning skids. ABS should prevent brake-induced skids or jackknifes, but not those caused by spinning the drive wheels or going too fast in a turn.
  • All of these answers are true
  • ABS will not allow you to drive faster, follow more closely or drive less carefully.
  • ABS will not prevent power or turning skids. ABS should prevent brake-induced skids or jackknifes, but not those caused by spinning the drive wheels or going too fast in a turn.
  • ABS will not necessarily shorten the stopping distance. ABS will help maintain vehicle control, but not always shorten the stopping distance.
  • ABS will not increase or decrease ultimate stopping power. ABS is an “add-on” to your normal brakes, not a replacement for them.
  • ABS will not change the way you normally brake. Under normal brake conditions, your vehicle will stop as it always stopped. ABS only comes into play when a wheel would normally have locked up because of over braking.
  • ABS will not compensate for bad brakes or poor brake maintenance.
  • Remember: The best vehicle safety feature is still a safe driver.
  • Remember: Drive so you never need to use your ABS.
  • Remember: If you need it, ABS could help to prevent a serious crash.
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Question #164 (3 of 4)

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What happens if your ABS light stays on indicating that your ABS has malfunctioned?

  • You will actually have more braking power than normal but it will be hard to control and could easily lock up the brakes, even under normal application pressure. Do not drive the vehicle.
  • You still have regular brakes. Drive normally, but get the system serviced soon.
  • Get stopped immediately. Do not drive the vehicle. Call a repair service or tow truck.
  • You will still have some brakes, but they will have considerably less stopping power. Do not drive until it is fixed.
If your ABS malfunctions, you still have regular brakes. Drive normally, but get the system serviced soon.
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Question #166 (4 of 4)

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How much more quickly can you stop with ABS?

  • About 10% shorter stopping distance
  • About 25% shorter stopping distance
  • ABS will not necessarily shorten the stopping distance. ABS will help maintain vehicle control, but not always shorten the stopping distance.
  • About 20% shorter stopping distance when loaded, 25% when empty
ABS will not necessarily shorten the stopping distance. ABS will help maintain vehicle control, but not always shorten the stopping distance.
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