Poor braking

Well guys I didn’t want to be that guy and not state my issue so here’s the findings. So I pulled all hoses from service side of chambers they all good pressure. So next I pulled parking brake lines and checked them they were good. Between checking the pressures I would leave the line off with the gauge off and mash the foot pedal to blow any contamination out of the lines and or valves. Well I realized the small line which went to the park brake side of each chamber had good pressure when venting to the atmosphere. Well the bigger line which goes to the service side of the brake chambers I noticed had air coming out but nothing to brake about hints my bad braking issue. So I also check all lines from the tanks and foot valve everything checked out good. So the relay valve on the back axle for the parking brakes I noticed had some oil water looking mixture coming out of it when I pulled the signal line off. So I pulled the valve cleaned it relubed And everything put it back together. Pulled the relay valve and abs modules to find the same issue. Pulled everything apart cleaned it re greased it all up. Soon as I pulled the plunger from the signal line side of the valve, which I couldn’t move it with my fingers so had to take a rag and some pliers to pull it out. it was all gummed up with oil and this and that. So I said heck that’s the issue the plunger was stuck. So like I said cleaned it put it all back together. Hooked the lines up and left the service lines all off to the brake chambers. So I walked over hit the foot valve and bam had more air than the sky. The brakes work like and absolute charm now can’t complain.

 

How old is your airdryer cartridge?
How old is your compressor?

 

Compressor needs changing had about 2-3 oz of oil in tank under the can

 

If you change the compressor,change the airdryer or at least the cardrige.
And clean the lines from the compressor to the dryer.