Still don't know how to test the trailer brake without Hand Valve.

You mean that lil handle thingy next to my steering wheel is NOT for stopping or parking? I had no idea! Is that why my trailer brakes are always smoking?

 

Yes if you want to visually check the brake adjustment use the stick of your choice to apply the brakes and crawl under to examine. Ideally you will already have the tractor brakes set from pulling the yellow button, so that you don't run over yourself if the stick pops out.

 

unless the tractor brakes are out of adjustment. LOL

when i first came back on the road. i stopped for fuel. yellow valve. truck rolled a little.
applied red valve. released yellow valve. adjusted brakes. shop replaced all 4 slacks when truck got back.

 

Ummmmm you could try hooking your red glad to your blue trailer pushing in will apply air to activate your trailer brakes, just sayin.

 

that might be too much air pressure for the smaller springs in the service chamber to handle. might even blow out the can..???

don't forget, the service line runs off the brake pedal as the trolley does.

 

full application should be at max pressure, some places if you dont rebuild your air after releasing your brakes to do your leak test you fail. just sayin

 

some trucks will blow the valve on teh truck if you apply too much pressure using the trolley.

we had an idiot driver that always used the trolley when parking the truck. and every 3 weeks he was getting a new valve.

the mechanics finally took his handle off.

 

I guess that's why they fail it is suppose to hold full pressure throughout the system
the mechanics finally took his handle off.

 

no, when you apply the brake pedal. very seldom does your pressure hit 40 pounds. which is pretty high when stopping in traffic. without the jakes.

he uses his trolley to park the truck. his brake lights were always on and he's standing outside BSing with someone.
his handle doesn't stay in position unless it's all the way down.

120 POUNDS OF PRESSURE BEING APPLIED TO THE TRAILER BRAKES. that's why the valves kept blowing.

the valve isn't designed to hold 120 pounds of pressure. becuase your brakes never exceed 40 pounds of pressure from the pedal.

60 pounds is the highest i ever hit. and that was a dump truck that didn't have brakes. untill the shop replaced ALL the drums. then the thing would stop on a dime and never got above 30 pounds.