1951 Mack LJ Posted November 25, 2012 Share Posted November 25, 2012 So I am working on my 1958 other brand truck.... It is a Pete. It has a cummins 350 with jakes on all three heads. I saw a truck years ago that had a switch on the dash for each head so one could change how much braking power they wanted from the engine. Is this in any way bad for the engine to have only one or two jakes on compared to all three. Quote Link to comment https://www.bigmacktrucks.com/topic/28531-wiring-up-jacobs-brakes-and-rest-of-truck/ Share on other sites More sharing options...
theakerstwo Posted November 25, 2012 Share Posted November 25, 2012 It will not hurt the engine. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/28531-wiring-up-jacobs-brakes-and-rest-of-truck/#findComment-148072 Share on other sites More sharing options...
masterwelder Posted November 25, 2012 Share Posted November 25, 2012 I heard the unbalanced force of the jake could harm the crank... not sure how true that is though. I always run it on 3 on our 300 cummins, very powerful I might add. Quote Link to comment https://www.bigmacktrucks.com/topic/28531-wiring-up-jacobs-brakes-and-rest-of-truck/#findComment-148074 Share on other sites More sharing options...
Superdog Posted November 25, 2012 Share Posted November 25, 2012 That's a 3 stage jake,very common,but you'll find out it don't do much on 1 or 2,least mine don't.Put it on 3 and it will put you thru the windshield. Quote Link to comment https://www.bigmacktrucks.com/topic/28531-wiring-up-jacobs-brakes-and-rest-of-truck/#findComment-148080 Share on other sites More sharing options...
masterwelder Posted November 26, 2012 Share Posted November 26, 2012 Yea, stage 3 on my cummins is just like slaming on the brakes!! The only drawback is the jake is realy loud, you gota have ear plugs! Quote Link to comment https://www.bigmacktrucks.com/topic/28531-wiring-up-jacobs-brakes-and-rest-of-truck/#findComment-148125 Share on other sites More sharing options...
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