In this video, we learn how to bleed and adjust trailer brakes. First, level the trailer and use a jack stand to support it. Now, hand bleed the brakes using the master cylinder. From here, let any air out of the break line, doing this on all the different brake lines. Next, fill up the master cylinder with oil to make sure it doesn't run dry. Open the pressure valve and then close it as your run through the process. When finished, you will need to adjust the brakes by lifting the trailer. After you have adjusted the brakes, check the fluid levels and then top off if needed.