2009 freightliner business class M2 air brake problem

Dec 16, 2017 #1

air brakes work fine and then get and stop and go traffic, air goes down and will not build back up until it gets down to 50 psi

freddiesmobile, Dec 16, 2017

#1

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Dec 17, 2017 #2

I would say replace purge valve. It does a very crappy job. Seems you are not building air and it would cause this.

Glenn West, Dec 17, 2017

#2

freddiesmobile Thanks this.