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I do understand how air brakes work...wasn't looking for basic information. Was just trying to find out how to diagnose the buzzer problem. I did misuderstand the spring brake overide button since it's not set up like a commercial truck. The problem isn't that I'm losing air pressure....it...

Haven't been around this truck much so I'm not that familiar with it.... So if I understand what the manual says, the spring brake overide button is only used during maint. check of brakes and not like a commercial truck as a park brake. So, does the floor mounted park brake also dump the air...

On my M931 the low air brake buzzer usually goes off after pressure builds up but after braking a few times it comes on again. The brakes operate normally, but I've found that the spring brake override button won't lock the brakes in either in/out position. The manual parking brake (lever on...