I have a 04 classic. The air compressor is building up air, but when it spits off it make a hissing noise then drops down to 110 p, then builds uo to 130, then repeats itself. Any suggestions on what this my be will be gratl appreciated.
Got a question, need answer
Discussion in 'Trucks [ Eighteen Wheelers ]' started by bigo1969, Sep 20, 2009.