Big Thanks to Richard!
Issue - Air Brake Relay Valve hidden in the rear tire area.
The issue was the one plastic piece wore out and eventually became two! This created a constant flow of air that could be heard will the engine and compressor was running.
The answer was a rebuild kit for this particular Air Brake Relay Valve. You will need a ring tool to remove the old piece and to install the new assembly. BE CAREFULL!!! It took me several attempts to install the new assembly. After each failed attempt the pieces would fall and spread out all over the place. Examine each attempt very carefully so you have each part before you secure the ring.
For my 1996 the rebuild kit was just $25 plus the $16 ring tool.
Issue - Air Brake Relay Valve hidden in the rear tire area.
The issue was the one plastic piece wore out and eventually became two! This created a constant flow of air that could be heard will the engine and compressor was running.
The answer was a rebuild kit for this particular Air Brake Relay Valve. You will need a ring tool to remove the old piece and to install the new assembly. BE CAREFULL!!! It took me several attempts to install the new assembly. After each failed attempt the pieces would fall and spread out all over the place. Examine each attempt very carefully so you have each part before you secure the ring.
For my 1996 the rebuild kit was just $25 plus the $16 ring tool.
1996 - 411 42'