If you are unable to correctly spell "brakes", you probably don't have the skills required to perform a brake job.
emergency brake...
Brakes.
The brakes will remain on, air pressure is required to release the brakes
A parking brake system is not required if your service brakes are fully self-locking. Air brake systems (on semis, for instance) hold the brakes open only when air is supplied. If you blow the air the brakes lock under spring pressure.
Endorsement - if you live in a country which requires it for the operation of air brake equipped vehicles. If you live in the US, air brakes aren't an endorsement - a CDL holder will receive a restriction prohibiting them from operating an air brake equipped CMV if they do not complete the written air brakes test and perform their road test in an air brake equipped vehicle. Certificate - an ASE certificate for air brakes must be awarded to someone before they can legally make adjustments to or perform maintenance on an air brake system.
You complete the written air brakes test, and perform your road test in a vehicle equipped with air brakes.
brakes
The brakes on the Villager are as straight forward as the brakes on a 1965 Mercury. Only normal brake tools are required.
It's not the actual weight, but the weight rating of the trailer which determines if brakes are required on the trailer, and they vary from state to state. In most states, trailer brakes are required on any trailer with a GVWR of 3,000 lbs. or more. In some states, the requirements may be as low as 1,000 lbs.
Take the written air brakes test, and perform a road test in a combination requiring a Class A CDL which is equipped with air brakes.
Many dealers charge any where from $210 - $350. It all depends on the rotors, if they can be machined then it will be toward the lower end.