mscamping wrote:
No it is not necessary, I've changed many without doing that.. I go to NAPA and get a kit and crawl under and change.. They are in the backing plate for the brake on the inside of the dualls..Kit should have sensor with about 4' harness that just plugges into the harness on the chasiss..There'll be a round spring clip that you put into the hole before you install the sensor, take the old one out first, don't use it even tough it looks good.. Just follow the directions.. You need to run the coach, I think 10 mph to reboot the system to make the light go out.. Mike Mathews..
After many calls to Meritor and attempting to replace the sensor myself I discovered that my sensor is internal. The wire goes thru the rubber gourmet on the outside of the brake backing plate and continues inside to a holding clip. The sensor in angled at 90 degrees. End result required taking off both wheels and the brake drum. Part cost $14.00 labor $150.00
Lesson learned
Thanks to everyone for their help