I just finished hooking up my Mico emergency brake system. It works "tits"! This system came with the bus but the previous owner didn't know how it worked. I found some info on line and made a call to the mfg and figured it out. It is mainly suppose to be wired that if the bus has a wheel chair lift the Mico brake brakes locks the rear tires so the bus doesn't move while the chair is being loaded. The way I wired ( with limit switch on e brake pedal) is that any time I depress my e brake pedal the Mico brake automatically engages and the back tires can NOT be moved. My stock e brake didn't work very well even after I replaced the shoes and adjusted. The brake system retails for around $1000 and was on the bus when I bought it. Sometimes things do work out for the good. If you guys see a used on for sale pick it up and install it. I also wired a pilot light on the dash that goes on every time the e brake pedal is anywhere but in the fully up position.
My limit switch located by the e brake pedal
the control box for the Mico 690
pump and actuator located under the bus