cgallamore Posted February 19, 2010 Share Posted February 19, 2010 The big red P dashlight that comes on when you set the parking brake.Today I was drving down the road 70 mph and the big red P flashed. When I release parking brake on the tractor if I don't push the valve hard and straight it leaks air inside the dash. I can reset parking brake and push in hard and straight and release and it will be fine. Could this have anything to do with the big red P flash while driving down the road?Or is the flash just a hiccup? Quote http://www.bigmacktrucks.com/uploads/1272400769/gallery_4852_794_314995.jpg Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/ Share on other sites More sharing options...
cgallamore Posted February 20, 2010 Author Share Posted February 20, 2010 no one has input? Quote http://www.bigmacktrucks.com/uploads/1272400769/gallery_4852_794_314995.jpg Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-49986 Share on other sites More sharing options...
fjh Posted February 20, 2010 Share Posted February 20, 2010 no one has input? Sorry one hicup I guees! Quote Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-49989 Share on other sites More sharing options...
bts-4120 Posted February 20, 2010 Share Posted February 20, 2010 my 01 did this once or twice then quit never happened again Quote Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-49991 Share on other sites More sharing options...
cgallamore Posted February 20, 2010 Author Share Posted February 20, 2010 it did it one time. but it will sure get your attention! Quote http://www.bigmacktrucks.com/uploads/1272400769/gallery_4852_794_314995.jpg Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-49996 Share on other sites More sharing options...
bts-4120 Posted February 20, 2010 Share Posted February 20, 2010 oh yeah first time it happened 3am in bfe with the cruise set at 75 Quote Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-49997 Share on other sites More sharing options...
John Paul Posted February 20, 2010 Share Posted February 20, 2010 The big red P dashlight that comes on when you set the parking brake.Today I was drving down the road 70 mph and the big red P flashed. When I release parking brake on the tractor if I don't push the valve hard and straight it leaks air inside the dash. I can reset parking brake and push in hard and straight and release and it will be fine. Could this have anything to do with the big red P flash while driving down the road?Or is the flash just a hiccup? Quote Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-50004 Share on other sites More sharing options...
John Paul Posted February 20, 2010 Share Posted February 20, 2010 The big red P dashlight that comes on when you set the parking brake.Today I was drving down the road 70 mph and the big red P flashed. When I release parking brake on the tractor if I don't push the valve hard and straight it leaks air inside the dash. I can reset parking brake and push in hard and straight and release and it will be fine. Could this have anything to do with the big red P flash while driving down the road?Or is the flash just a hiccup?I've got a 2000 vision. There's a pressure swithc above brake pedal for this. Don't think it has anything to do with yellow vlv leaking. My switch just started leaking and big P stayed on. Quote Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-50005 Share on other sites More sharing options...
FIREMAN Posted February 20, 2010 Share Posted February 20, 2010 My big red P comes on every so often,you are right it will get your attention. I don't know if anyone else has this happen to them... When I get into a hard pull the little lightning bolt that show the codes comes on for a second or two. If you catch it quick enough and try to get what code it is sending it won't blink any numbers Quote Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-50009 Share on other sites More sharing options...
cgallamore Posted February 21, 2010 Author Share Posted February 21, 2010 My big red P comes on every so often,you are right it will get your attention. I don't know if anyone else has this happen to them... When I get into a hard pull the little lightning bolt that show the codes comes on for a second or two. If you catch it quick enough and try to get what code it is sending it won't blink any numbers i have had 2 other trucks do the lightning bolt thing like that, right at the begining of a hard pull, i just thought it took a few seconds for every thing to ajust to the pulling Quote http://www.bigmacktrucks.com/uploads/1272400769/gallery_4852_794_314995.jpg Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-50039 Share on other sites More sharing options...
Rayray c Posted July 12, 2022 Share Posted July 12, 2022 My red p came on yesterday and lighting bolt.the lighting bolt comes with acceleration and stays.the red p comes after it warms up and stays Quote Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-502860 Share on other sites More sharing options...
Joey Mack Posted July 12, 2022 Share Posted July 12, 2022 ray ray. what year and model truck? I think the 'P' is for the park brake. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/12713-the-big-red-p-dashlight/#findComment-502869 Share on other sites More sharing options...
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