SMFire History Posted October 13, 2015 Share Posted October 13, 2015 We have a 52 LS fire engine with air brakes. The system is sound (although it leaks down over time) except that the maxi brake switch leaks like mad from 0-50 psi. It stops leaking once the air pressure is up and functions normally. It will also stop leaking in the 0-50psi range if I pull and hold the switch (disengage mode). I did remove the switch and cleaned it out with compressed air with no better results. Spring problem? Pics attached.Suggestions where to start?Shows a minor repair kit available: http://www.sealcocvp.com/prod/catalog/099600/index.htmThank you,Dominic SmithSanta Monica Firefighters Historical Society Quote Link to comment https://www.bigmacktrucks.com/topic/42188-maxi-switch-overhaul/ Share on other sites More sharing options...
41chevy Posted October 14, 2015 Share Posted October 14, 2015 Most likely weak spring and O Ring seals from age. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/42188-maxi-switch-overhaul/#findComment-307387 Share on other sites More sharing options...
SMFire History Posted October 15, 2015 Author Share Posted October 15, 2015 I'll take a look at a rebuild kit and see what I can do. Looks like replacements are still available as well.Thanks. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/42188-maxi-switch-overhaul/#findComment-307521 Share on other sites More sharing options...
SMFire History Posted October 16, 2015 Author Share Posted October 16, 2015 Picked up a brand new switch today. Less than $40. Quote Link to comment https://www.bigmacktrucks.com/topic/42188-maxi-switch-overhaul/#findComment-307708 Share on other sites More sharing options...
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