[smagown]

Mine has two air brake relays, one on the tag and one on the drive axle. The front axle has what I thought was another relay vale but Richard identified that one as a QR-1 quick release vale.I changed the one on the tag in my shop, the next blew 70 miles north of Atlanta last 4th of July. It was for the drive axle. I limped into the Speedco on the back of the parking lot at 4pm on a holiday Saturday. I got in the queue and they came out and said we don't work on RV's. I told them it was a Class 8 truck identifying as an RV. One of the techs got under there and hollered out the brake relay is leaking, I think we have it in stock. Nope, they didn't. I dry camped beside the building until the lead tech came in Monday morning at 6:30. He crawled under and confirmed the problem. He was going on a mobile call and would check at the Freightliner store, took my model number and VIN. I left right behind him and went to a Peterbilt dealer. First thing he asked was make year model and VIN, of course it didn't show up. I asked for his Bendix catalog, knowing that the center spool was the same on all of them. The third pic I pointed to he said I have it, it was $67. I got back to Speedco just as the lead tech called to tell me my part was unavailable. I told the service writer to tell him I was standing there with part. He got back, pulled the spool and stuck my new pieces in in about two minutes. Replace these and carry spares so you won't go thru what I did.