waayfast

HHHMMM ,If it is indeed a brake can (with park brake, sometimes called a piggy back can cause it is both service brake and park brake),sometimes those brake chambers can be sneaky little fellers---once in a while the rubber diaphram de-lams (leaks thru layers for better way to explain it) so sometime it leak sometime it dont.YES!!!AIR CANS CAN KILL YOU!!!Unless you are experianced or can take it to someone who is DONT TRY TO TAKE IT APART!! Just buy a new one -they aint all that spendy- easy to change as a unit.A lot less time than wandering around your neighbors back yard looking for your HEAD!You may be lucky--trhe leak could be in a hose going to the can.