______ brake action is nearly always an indication of air in the brake hydraulics system.

• A. No brake action
• B. Spongy
• C. Rough
• D. Delayed

Answer: (B)

Air in the brake hydraulics makes the brake action feel spongy because air pockets compress under pressure, so when you push the pedal you first compress the air rather than moving the brake pistons. That soft, mushy pedal and extra travel tell you the hydraulic fluid isn’t transmitting pressure as a solid, incompressible medium. Bleeding the system to remove the air restores a firm, immediate pedal feel and full braking effectiveness. The other signs describe different problems: no brake action means a total loss of hydraulic pressure (leak or pump failure), rough action suggests mechanical issues like worn parts or sticking components, and delayed action can result from various non-air causes and is not as diagnostic of air in the lines.