Specialist part · #6434 · 1 pts
What does it mean when the braking pedal sinks down when you start the engine as you press the pedal?
aThat the power brake system is working.
bThat there is a high level of brake fluid in the master cylinder reservoir.
cThat the ant-lock braking system (ABS) is working.
Why?
A slight drop in the pressed brake pedal when the engine starts indicates that the brake booster is working and reducing the effort needed to brake. In the photo, the arrow indicates the direction of movement of the middle pedal, which is the brake. This movement does not indicate a high brake fluid level or ABS operation, which prevents the wheels from locking during braking.