rmodelowner Posted March 27, 2013 Share Posted March 27, 2013 I took my 76 r model a test drive yesterday started leaking out air near all the parking dash knobs when i apply the foot brake:( Messing around i figured out if i push the red trailer supply knob in everything works absolutely perfect:) Im still learning so a point in the right direction would be appreciated. like i said im still learning but im figuring the dash knob needs replaced or theres a valve under the truck clogged. Is it possible the farmer who owned it before hooked up the knob backwards? its a gravel truck i think it used to be a oil field water truck. there is a set of glad hands under the truck and it used to have pintle hitch. LIke i said if i keep it pushed in it all works perfect but seems to me thats backwards seeing as i have no trailer. its got the yellow red and blue knob. also when i park i pull the yellow if i pull the blue it leaks a little. wasn't worried about that but maybe related? other than that everythings great taking it for a safety next week hopefully all my work will pay off and the old girl can be a work truck once again and start paying me back! Quote Link to comment https://www.bigmacktrucks.com/topic/30568-trailer-parking-brake/ Share on other sites More sharing options...
rmodelowner Posted March 31, 2013 Author Share Posted March 31, 2013 It was the tractor protection valve behind the cab that the glad hands go to. case closed Quote Link to comment https://www.bigmacktrucks.com/topic/30568-trailer-parking-brake/#findComment-175243 Share on other sites More sharing options...
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