ASE G1 Auto Maintenance and Light RepairBrakesHard
A vehicle experiences a sudden, complete loss of braking effectiveness while driving. The brake pedal goes straight to the floor with no resistance. There is a strong smell of burning fluid. What is the MOST likely cause of this catastrophic failure?
- AA seized caliper piston.
- BWarped brake rotors.
- CA ruptured brake hose.
- DA faulty brake booster.
Show answer & explanationAnswer & explanation
Correct answer: C. A ruptured brake hose.
A sudden, complete loss of braking with the pedal going to the floor and a burning fluid smell strongly indicates a massive hydraulic fluid leak. A ruptured brake hose would cause a rapid loss of fluid from one circuit, leading to complete pedal drop and the smell of hot, leaking fluid on exhaust components.
Why the other options are wrong
- A. A seized caliper piston would cause a pull and potentially reduced braking on one wheel, but not a complete, sudden loss of pedal to the floor for the entire system.
- B. Warped brake rotors cause pulsation and vibration, not a sudden, complete loss of braking effectiveness or a pedal that goes to the floor.
- D. A faulty brake booster results in a hard pedal requiring excessive force, not a pedal that goes straight to the floor with no resistance.
Brake Hose Rupture
A ruptured brake hose causes a sudden, complete loss of hydraulic pressure in one circuit, leading to the brake pedal going to the floor and potentially a burning fluid smell.
- Sudden pedal loss
- Complete loss of pressure
- Burning fluid smell possible
Memory trick: Pedal to the floor, burning smell, a ruptured hose casts its spell.