Technician A says a low pedal may be caused by air in the hydraulic system. Technician B says a low pedal may be caused by improperly adjusted shoes. Who is correct?

Question

Quizplus · Accepted Answer

Both technicians are correct. Air in the hydraulic system can cause a spongy or low brake pedal because air is compressible, unlike brake fluid. Improperly adjusted brake shoes can also lead to a low pedal, especially in drum brake systems, because the shoes have to travel further to contact the drum, which results in a lower pedal feel.

Technician a Says a Low Pedal May Be Caused by Air