Airlines contamination

What does the line from the compressor to the dryer look like? Does it have the same contamination in it? Also have you traced all your airlines and make sure they are still routed properly? Did the dryer cartridges fail or did you just replace them thinking it would fix the problem? You can disconnect lines on either end and flush them with brake cleaner, solvent etc. just make sure it is compatible with the lines and does not destroy them. If you have any rubber brake hoses you might want to replace them if your contaminant is oil. Sounds like your dryer is not working right or by passed to end up with that stuff in all your brake valves.

 

Sounds like your compressor is pumping a little oil into the system. Oil attracts and holds moisture to make up the tan/yellow looking goo. It doesn't take much oil in the air system to cause problems and it wouldn't necessarily show oil consumption of the engine. The air dryer wasn't designed to be an oil separator, so the oil also limits its maximum function capacity.

 

All you can do is replace the air compressor and the system will clear on its own.

 

There is one more thing to check that is a possibility. The transmission vent, if plugged allowing the trans to build pressure or system air pressure from trans controls pressurizing the trans. This could force trans fluid into the air system and appear yellow in color.

 

On top of the trans to the rear.

 

yep, bad compressor makes many problems with damaged with oil brake modulators, TCU and other expencive stuff

rebuilt THE COMPRESSOR in time