xm817 brake issue

[Chris B in Pa]

I've had my 5 ton for quite a while. Brakes have always been unpredictable,but worked. I use my truck to haul stone from my stone pit for my driveway care. this year when i got it out to use,naturally brake fluid was low,so i filled it up. started out working ok, then it got to where you can not push the pedal at all is there any help for me?

 

[Monkeyboyarmy]

Check the glad hands on the front of the truck. The one on the passenger side needs to be vented.

 

[Chris B in Pa]

I checked gladhand it was plugged. thought that was going to do it until i took it for a drive it might be a little better but still not safe. part of the timei can hear sound of air coming, then vent when i let off the pedal....

 

[country]

The brake booster needs to be replaced most likely

also check the air check valves that run along the frame (under the driver seat area approximately)

 

[Chris B in Pa]

thank you i'll check them.how many are there? maybe that's why they sometimes work.