previously the stop buzzer goes off at around 4, but now the air pressure gets up to 8 and it is still buzzing,i cannot get the air pressure any higher.can anyone help?

lynn, January 2009

Maybe stupid thing to say but maybe the buzzer is warning of something other than the air, for example the bulb in the oil warning light on mine doesn't work, but the buzzer sounds when it should come on. Flick the switch which checks all the bulbs, there should be ignition, oil, water, charge? worth a try

joe, March 2009

Yes, I agree with Jim P. The only other unlikely possibility is a wiring problem You can check this by disconnecting the wire onto the pressure switch while the buzzer is sounding. If the buzzer stops then the switch is faulty. If the buzzer continues then you have a wiring problem.
what area are you in with your TK lorry? I have a spare windscreen for a TK and I am going to toss it soon.

Bill W., February 2009

Its got to be a faulty Pressure switch which is fitted in the air tank

Jim P, January 2009