On my 2000 Tropical with tag axle the master cylinder and vacuum booster are mounted between the drive axle and the tag axle towards the right side. The vacuum that applies the tag brakes is supplied by the engine and regulated by a valve actuated by brake fluid pressure. The tag axle assembly on mine is supplied by Mor ryde with the axle itself made by Dexter. I believe that there may be other types of brake systems used on Morryde tag axles so I can only comment on what's on mine. The tag master cylinder on mine is from a 1951 Ford 1/2 ton pickup. There was no fluid in my tag reservoir when I checked it. The leak was through the seal at rear piston of the master cylinder
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Fred & Darla 2000 Tropi-cal and 2016 Chevy Sonic toad
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