🎓 Prepared by students from Boğaziçi University

What to Do When Brakes Fail?

Brake system failure is a critical emergency requiring immediate, controlled action. Loss of braking power can occur suddenly due to hydraulic failure, air in brake lines, or overheating. Knowing emergency procedures can prevent collision and save lives.

Short answer

If brakes fail, pump the brake pedal firmly 3–5 times to restore pressure; engage the handbrake gradually; downshift to lower gears to slow the engine; and steer toward open space or an uphill road to stop safely.

Emergency Response to Brake Failure
  1. 1
    Pump Brake Pedal
    Press pedal firmly 3–5 times quickly to rebuild hydraulic pressure
  2. 2
    Engage Handbrake
    Pull or press emergency brake gradually to avoid skidding
  3. 3
    Downshift Gears
    Shift to lower gears (3rd, 2nd, 1st) to increase engine braking
  4. 4
    Steer to Safety
    Guide vehicle to open space, uphill, or crash barrier — never into traffic
  5. 5
    Signal & Stop
    Hazard lights on, horn, and gradual stop at safe location
01

Step-by-step worked examples

Brake pedal goes soft while descending a mountain. Procedure?

1. Pump pedal 3–5 times firmly
2. If still soft, engage handbrake gradually (not suddenly)
3. Downshift to 2nd or 1st gear
4. Steer vehicle to shoulder or uphill exit
5. Use parking brake if needed; signal hazard lights

Brakes fail on a city street at 50 km/h. What actions?

1. Pump pedal hard and fast (3–5 times)
2. If ineffective, handbrake ON slowly
3. Downshift from 3rd to 2nd
4. Steer toward curb or empty lot (not parked cars)
5. Honk horn, turn on hazards, and coast to stop

Both pedal-and-handbrake are inoperative. Last resort?

1. Downshift aggressively to 1st gear
2. Steer for barrier, curb, or uphill to absorb impact
3. If all else fails, controlled collision into a non-vehicle target
4. Brace and call emergency (112 in Turkey)
02

Flashcards

03

Quick quiz

Q1.Brake pedal becomes spongy while driving. First step?

Correct answer: B. Pumping rebuilds pressure in the brake circuit. Do this first.

Q2.Pedal pumping didn't restore brakes. Next action?

Correct answer: B. Handbrake gradually applies mechanical braking while pedal pressure rebuilds.

Q3.Why downshift during brake failure?

Correct answer: B. Lower gears increase engine resistance/drag, providing braking without hydraulics.

Q4.Brakes fail on a busy highway. Where to steer?

Correct answer: B. Steer away from traffic and people. Uphill or shoulder offers safer deceleration.
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04

Common mistakes

If brakes fail, keep pressing the pedal harder.Correct: Pump it 3–5 times, not continuously. Then use handbrake and gears.

Pulling the handbrake hard and fast stops you instantly.Correct: Gradual engagement maintains grip. Hard/sudden pull causes skidding.

If pedal and handbrake fail, accelerate to clear the road.Correct: Downshift to 1st, steer toward open space, and coast to a stop.

Brake failure is just a warning light; keep driving slowly.Correct: Total loss of brakes is a life-threatening emergency requiring immediate action.

05

FAQ

What should I do if my brakes fail while driving?

Pump the brake pedal 3–5 times firmly. If unsuccessful, engage the handbrake gradually, downshift to lower gears, and steer toward open space or uphill to stop safely.

Why pump the brake pedal during brake failure?

Pumping rebuilds hydraulic pressure in the brake circuit. Often 3–5 pulses restore braking enough to stop safely.

Can downshifting slow a vehicle without brakes?

Yes. Downshifting to 2nd or 1st gear increases engine drag (friction), providing significant braking power without hydraulics.

Is pulling the emergency brake hard during brake failure safe?

No. Engage the handbrake gradually. A sudden, hard pull causes skidding and loss of steering control.

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