Question

question 1-20
a vehicle equipped with disc/drum brakes has a spongy brake pedal. the brake fluid level in the master cylinder is okay. which of these could be the cause?
air in the brake hydraulic system
a master cylinder push rod out of adjustment
worn brake pads
low vacuum supply to the brake booster

Explanation:

To determine the cause of a spongy brake pedal with normal brake fluid level:

• Air in the brake hydraulic system compresses, causing sponginess (correct).
• Master cylinder push rod adjustment affects pedal travel, not sponginess.
• Worn brake pads affect braking efficiency, not pedal feel.
• Low vacuum supply affects power brakes (hard pedal), not sponginess.

Answer:

A. air in the brake hydraulic system