How probblem shoot on volvo air brakes lines?

Answer 1

I'm assuming you're talking about a Volvo truck, and not a car, namely by the presence of air brakes.

It would help if we knew what your issue was to begin with. Are you having a loss of air pressure?

In that case, go over your air lines with a spray bottle filled with a mixture of soap and water.. anything which bubbles up is leaking air. Be especially certain to check the leveling valve at the rear of the truck and the air line coupling at the top of the transmission (at least with Eaton-Fuller transmissions, it's up top and located toward the passenger side... not sure about Rockwell or the European synchronized transmissions), as those are two traditionally problematic areas for all makes of truck.

Check also your air bags both for the suspension and for the cab mount... I know, personally, I ripped up a cabin air bag when I strapped some coil dunnage to the wheel fairing, and shoved it a little too far forward on a Volvo VNL730.

Your truck will also have an air actuated fan clutch, most likely... this is true whether you have the Volvo, Cummins, Detroit Diesel, or Caterpillar engine (Detroits were available on North American Volvo trucks until 2002 and Caterpillar engines were available until 2009). Check the air coupling there.

Finally, and it helps to have a friend for this one, check your brake chambers. Either put your truck in gear (with the engine off) and/or chock your wheels to prevent it from rolling, release the brakes, and listen. Then, do the same thing again, only again with the brake pedal pressed (I use a hood prop for this). If you hear escaping at this point, it's a brake chamber... you can narrow it down by taking a set of needle nosed vice grips and pinching off the hoses to each brake chamber until you hear the air stop (at which point, you've found your culprit), or, in the case of the fault being in the service chamber, you can locate the bad brake chamber by sound alone.