Don Wilson jr Posted November 10, 2013 Share Posted November 10, 2013 I have a R model that was originally a Fire truck that was built in the Mack factory. What does anyone know about front disc brakes that are hydraulic powered by air. It is a factory installed option that is a Kelsey hayes system. Are parts still available for this type of brake system. Quote Link to comment https://www.bigmacktrucks.com/topic/33451-1976-r-model-mack-front-hydraylic-brakes/ Share on other sites More sharing options...
j_martell Posted November 11, 2013 Share Posted November 11, 2013 Not sure about this specific set up, but the pig farmer I worked for had a small livestock trailer with air over hydraulic brakes. There was a master cylinder mounted above the landing gear with an air brake pot actuating it from glad hands on the 99 Mack c? Tractor that pulled it. Can't remember if it had spring brakes too.....Seemed to be a fairly simple set up. Surely someone with more knowledge than I will chime in.... Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/33451-1976-r-model-mack-front-hydraylic-brakes/#findComment-216053 Share on other sites More sharing options...
mowerman Posted November 11, 2013 Share Posted November 11, 2013 ya,,,im sure a clutch and brake outfit,,,could hook you up...good luck..bob Quote Link to comment https://www.bigmacktrucks.com/topic/33451-1976-r-model-mack-front-hydraylic-brakes/#findComment-216168 Share on other sites More sharing options...
gvam Posted November 12, 2013 Share Posted November 12, 2013 Hi DonNot sure if this helps, I think the older military trucks (like M35A2, etc) have an air over hydraulic brake systems. maybe can find some info thereGeorge Quote Link to comment https://www.bigmacktrucks.com/topic/33451-1976-r-model-mack-front-hydraylic-brakes/#findComment-216358 Share on other sites More sharing options...
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