I have an emergency brake.

我急刹车了。

youdao

An emergency brake pertains to an automobile standby brake device with the function of braking.

应急制动器是一种具有刹制性能的汽车备用制动装置。

youdao

Drum brakes have more parts than disc brakes and harder to service, but they are less expensive to manufacture, and they easily incorporate an emergency brake mechanism.

鼓式制动比盘式制动的零件多，维护也更困难，但鼓式制动造价便宜，且易于与紧急制动机构配合。

youdao

The tractor then carried on across the yard until another worker pulled an emergency brake on the vehicle.

BBC: Leicester

Their feelings spiral out of control at the slightest push, like a car parked on a steep hill without an emergency brake.

FORBES: The Woman Who Stops Patients From Killing Themselves

Pfizer's drug tremelimumab and Bristol-Myers Squibb's ipilimumab are antibodies to a protein called CTLA-4 (cytotoxic T-lymphocyte antigen-4) that acts as an emergency brake to prevent killer T cells from attacking healthy tissue.

FORBES: Targeting Melanoma