The brake pedal doesn't magically stop a vehicle - there's a whole chain of components working together to turn your foot pressure into stopping power.

Today on Motormouth's Morning Drive, we're looking at the power brake booster and it's relationship with the master cylinder, and I'm breaking it down in plain language so you can understand what's actually happening every time you step on the brake pedal.

What does the booster do ? What happens when you lose power assist? Where does the hydraulic system take over? And what is the failure point when something goes wrong?

We'll follow that brake pedal right through the system and set the stage for tomorrow's conversation: hydraulic brake failure - how it happens, why a brake pedal can suddenly go to the floor, and what you can do to help prevent it. ...