Measuring Drums to Determine Which Brakes are Needed

Helpful Expert Reply:

Take a look at the picture I attached of the drum. You need to measure the inner diameter of your trailer's drums to determine which brakes you need. You may also be able to use the axle capacity but the drum diameter is the better way.

For 10 inch brakes I recommend # AKEBRK-35-SA or for 12 inch # AKEBRK-7-SA. Both are self-adjusting and include the left and right hand sides. They're marked because it does matter which side they go on when installed.

If you get 10 inch brakes you also need the nuts and washers, part # BRKH10B. For the 12 inch brakes you need the nuts, washers, and bolts, part # BRKH12.

click to enlarge

helpful expert reply by: Charles S

1