Brakes (A5)Câu 49 / 120
Technician A says a pulsating brake pedal is usually caused by air in the hydraulic lines. Technician B says it is usually caused by rotor thickness variation or excessive lateral runout. Who is correct?
a.Technician A only
b.Technician B only
c.Both A and B
d.Neither A nor B
Giải thích
Thickness variation or warp causes the pads to move in and out as the disc turns, producing a pulsation felt in the pedal, while air produces a soft pedal instead. Technician B is correct. Measuring runout and thickness variation confirms it.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A brake pedal that slowly sinks to the floor while held under steady pressure most likely indicates:
- Technician A says a spongy brake pedal is commonly caused by air in the hydraulic system. Technician B says air in the lines increases braking power. Who is correct?
- The primary purpose of a brake power booster is to:
- The main function of an anti-lock brake system (ABS) is to:
- A wheel-speed sensor signal that is missing on one wheel will most likely cause the ABS to:
- Brake fluid is hygroscopic, which means it:
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