Originally Posted by Thomascine
According to the 1980 brochure, it should have electric brakes.
Yeah, and they are probably Kelsey Hayes brakes. Sometimes you find magnets for them, but the drum linings are no longer available. If you need to replace, you might have to replace the axles to fit modern brakes. But don't be scared, it's not nearly as expensive as you may think.
That said, unless the trailer has seen a TON of miles, it's very unlikely they'd be worn out enough that you'd need to replace them. More than likely any issue would be wiring related between the car or 7 way plug and the brakes.
You will need a trailer brake controller installed in your vehicle to use the brakes on this trailer, if it doesn't already have one.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR