Question

which of the following is most likely a symptom of normal abs unit operation?
a. wheel lockup under all driving conditions
b. transfer of brake pedal force hydraulically to a wheel cylinder
c. application of equal forces to both the left and right sides of the vehicle
d. activation of the hydraulic pressure pump

Explanation:

The Anti - lock Braking System (ABS) prevents wheel lock - up during braking. When the ABS detects a wheel about to lock, it activates the hydraulic pressure pump to modulate the brake pressure. Option A is incorrect as ABS prevents wheel lockup. Option B is a function of the normal braking system, not a specific ABS symptom. Option C is a general braking system goal but not a unique ABS symptom. Option D is correct as the activation of the hydraulic pressure pump is a sign of normal ABS operation when it senses a potential wheel lock situation.

Answer:

D. Activation of the hydraulic pressure pump