* "The car screeched to a halt as the driver slammed on the brakes." (This uses "brake" as a noun referring to the braking system.)
* "The bicycle rider braked hard to avoid hitting the curb." (This uses "braked" as the past tense of the verb "to brake".)
* "The train was unable to brake in time, causing a collision." (This uses "brake" as a verb in the present tense.)
* "The emergency brake on the bus was activated during the accident." (This uses "brake" as a noun referring to a specific part of the braking system.)
* "Be sure to brake gently when approaching a stop sign." (This uses "brake" as a verb in the imperative mood.)
You can use "brake" as both a noun and a verb, depending on the context of the sentence.