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You will need to add a brake controller to the system. RELATED: How Much Does a Gooseneck Hitch Installation Cost? and in both disc brake and drum brake varieties. Replace any worn parts and grease/lubricate as necessary. When wires fray or get damaged, the signals cant be sent where they must go. If the master cylinder does pump, proceed to the next step. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); Unlock exclusive member content from our industry experts. There are other possible electrical issues that you should look for when troubleshooting trailer brakes. While the brake drum is off, have an assistant manually operate the brake system using the breakaway lever. They will lock up also if I am going down an moderate incline. Look at the end of the brake line you just disconnected. To test the master cylinder, remove the brake line or hose from the rear of the master cylinder located on the surge actuator. You would have to reshape the brake drum so that its face is as flat as the magnets face giving the latter part more surface to grab onto. If there is no power getting to the 7-pin using the manual override, then you may have to replace the controller. You must log in or register to reply here. There is an electric solenoid valve in the hydraulic circuit from the actuator (master cylinder) to the wheels. If you have a Chevrolet, Cadillac, or GMC vehicle, there is a technical service bulletin for the service trailer brake system message that you should look into before you begin any other repairs. The first common problem you will find with RV trailer brakes will be loose connections. Hydraulic Surge Brakes .Magic Tilt Trailer . If not shorted, youd be measuring the resistance of the solenoid coil. If you use a manual override system to check your brakes, that override bypasses the red wire and applies the brakes on your trailer. These hoses commonly crack with age and spring leaks. When you apply your brakes in the truck to slow down, the truck is no longer pulling the trailer, and in fact the opposite occurs the trailer now tries to push the truck with a surge of force (thus the name surge brake).