Hi all, as the title suggests I am trying to remove the push in air line fittings before removing the air tank as everyone knows you just push in the collar and pull on the pipe unfortunetley they just will not move I have tried squirting with WD40 leaving overnight then blowing any dust and grimme that may be jamming the collar with the airline with no avail. I only want to cut into the lines and put a joint in as a last resort, does any one have any ideas on what else to try?
Tapping round the connectors with a hammer sometimes helps.
Par for the course. The pipe has probably been pushed in too far. Cut the pipe and renew the fitting.
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Drive off with it connected??
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Are you meaning a connector or joiner? If the former, have you twisted it to the unlock position?
No I think he means the push fit connectors. Ones often used to repair air pipes..
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That was my first impression.
Ah, those! Those come off easily when not under pressure …
Joining two pieces of pipe together or connecting to a thread has been a PITA all my working life, there are, and have been, so many different pneumatic fittings. Wade, Enotts, Imperial Eastman, Wira, Camozzi, Voss, Norgren, Raufoss and probably more I can’t recall. Some of these have several alternative designs and the recent trend has been mega- expensive release tooling. There are the various pipe diameters and wall thicknesses let alone the threads in the component, even Metric has fine, medium and coarse to contend with. And then there is…. Hydraulic: JIC 37, SAE 45, JIS, ORFS, NPT, NPTF, BSP, even BSF and British Standard Cycle Thread!
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Thanks for the replies, the pipe I wish to take off goes into the fitting that screws into the air tank on a rigid truck this has to be removed before I can rotate the fitting to unscrew it from the air tank. cutting into the air pipe then removing the tank to the workbench where I could remove the cut off end of pipe with the pliers and put a extra length of pipe in the system was always considered a last resort. I have contacted a “brake specialist” to come and sort this for me as HGV brakes are some thing which really have to be got right.
It appears its not these that he’s on about. But he’s going to need one soon 
Cav551 told you what to do.