I have a 2005 freightliner century. Every time I hook on a trailer and drive away, later on, after 30 or 50 miles or so my trailer brakes lock after I have used the pedal many times and it happens on the traffic light mostly the time. The brakes release after I apply trailer handle brakes. What would be the problem? Any one can let me know what to do to fix it? I would appreciate your help, suggestions, or ideas. Thank you
Brakes issues
Discussion in 'Ask An Owner Operator' started by Rookie2020, Jan 10, 2021.
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Possible clogged airline. Original lines? -
If its happening with different trailers I would check the tractor protection valve first. That is the valve on the tractor that the hoses to the trailer are supplied from.
Diesel Dave and kemosabi49 Thank this. -
Rookie2020 Thanks this.
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If your tractor brakes are out of adjustment and the trailers are in adjustment. Guess which one is going to work harder and which one is going to work less.
I had the same problem when I first started driving but I pulled the same trailer. Truck got new brakes and drums and adjusters. Problem solved.
Make sure your brakes are good and adjusted. Could rule that possibility out.Rookie2020 Thanks this. -
If it happens with every trailer, common denominator is the truck.
In that case, I would be checking for a sticking valve in the truck's trailer service circuit. If the air won't exhaust from the service line, the trailer brakes will stay applied. The fact that applying and releasing the spike gets them to release tends to support that theory.Cat sdp Thanks this. -
Abs valve, expensive, leaking break chamber leeking
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