An automobile has a soft, spongy pedal. The technician should check for

• A. Air In Lines
• B. A System Leak
• C. Worn Rotors
• D. Brake Fluid Color

Answer: (B)

A soft, spongy brake pedal means hydraulic pressure in the braking system is being compromised. The most direct cause to check for is a system leak, because leaking brake fluid lowers pressure and can let air enter the circuit, making the pedal feel mushy. Inspect for leaks around the master cylinder, along the brake lines and hoses, and at the calipers or wheel cylinders; look for wet spots, fluid residue, or fluid on the ground. If a leak is found, fix it and then bleed the brakes to restore proper pressure. If no leak is found, bleeding the brakes to remove any air would be the next step, since air in the lines can also cause a spongy feel. Worn rotors or brake fluid color don’t directly explain a soft pedal in the same way a leak does.