Which braking system is described as no longer effective below 2 mph?

Which braking system is described as no longer effective below 2 mph?

• A. Thelma brakes
• B. ABS
• C. Service brakes
• D. Emergency brakes

Answer: (A)

The concept here is that some braking systems only work effectively above a certain speed. Thelma brakes are described as not being effective below 2 mph, so once the vehicle slows to near a standstill, this system won’t contribute to stopping. That makes it the one that can’t be relied on for braking at very low speeds, which is why it’s the best answer to this question. ABS, service brakes, and emergency brakes each have functionality at low speeds or are designed to engage when you’re moving slowly, so they don’t share that 2 mph limitation described for Thelma brakes.

The concept here is that some braking systems only work effectively above a certain speed. Thelma brakes are described as not being effective below 2 mph, so once the vehicle slows to near a standstill, this system won’t contribute to stopping. That makes it the one that can’t be relied on for braking at very low speeds, which is why it’s the best answer to this question.

ABS, service brakes, and emergency brakes each have functionality at low speeds or are designed to engage when you’re moving slowly, so they don’t share that 2 mph limitation described for Thelma brakes.