RBH Posted May 18, 2018 Share Posted May 18, 2018 Can any one tell me if a 1953 A40 with factory air brakes has a low-air warning system. I have been dismantling the truck for a restoration and have yet to see any devises like a light or a mechanism that makes an audible sound. All I have seen at this point is the air pressure gauge located between the engine gauges and the speedo indicating to me that the truck was built with them by Mack. I will presume that DOT would require such a system if the truck were to run the public highways . Even if they didn't, I would for safety reasons. Where would the low-pressure switch be located (in general) if it does have one? Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/53376-low-air-warning/ Share on other sites More sharing options...
MHfred Posted May 19, 2018 Share Posted May 19, 2018 I do not know about your truck specificly but I would guess it had a wig wag which would have been mounted in front of the driver above the wind shield. When air pressure got low, a red arm would fall giving a warning. School buses had them for a long time and would be a good source for one. Quote Link to comment https://www.bigmacktrucks.com/topic/53376-low-air-warning/#findComment-399044 Share on other sites More sharing options...
j hancock Posted May 19, 2018 Share Posted May 19, 2018 There is possibility the truck did not have a warning device besides the driver watching the gauge. DOT then was not like the DOT today. A lot of old trucking pictures show plenty of bald tires and fenders held on with baling wire. A low pres. switch installed on the air tank or a firewall mounted air manifold running to a cab buzzer would work or you could plumb a wig wag. Only problem with a wig wag in front of the driver is that the header trim in an A model is sort of narrow to work with. I would go for an electric buzzer. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/53376-low-air-warning/#findComment-399046 Share on other sites More sharing options...
Hobert62 Posted May 19, 2018 Share Posted May 19, 2018 9 hours ago, j hancock said: I would go for an electric buzzer. Same here. The buzzer is simple, cheap, and easy to hide under the dash out of sight. Quote Link to comment https://www.bigmacktrucks.com/topic/53376-low-air-warning/#findComment-399067 Share on other sites More sharing options...
RBH Posted May 19, 2018 Author Share Posted May 19, 2018 Thanks fellas. Quote Link to comment https://www.bigmacktrucks.com/topic/53376-low-air-warning/#findComment-399076 Share on other sites More sharing options...
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