If your brakes fail you can use your emergency brake making sure that you keep the button on the end of the break pressed down so the wheels will not lock up true or false?

True. If your brakes fail, using the emergency brake can help slow down the vehicle safely. Keeping the button pressed down while pulling the emergency brake lever prevents the wheels from locking up, allowing for controlled deceleration. However, it's important to apply it gradually to avoid losing control of the vehicle.