The assemblers (Coleman, Massimo, Bennche, Odes, et al ) of these vehicles change their manufacturing sources more often than most of us change socks--also, for them "assemble" generally means putting on their brand's stickers.
Massimo re-sources their models often and has in recent years used at least six manufacturers (per EPA "can't hide" data¹--it's interesting stuff) some have produced only one or two models, others have produced numerous models, changing over the years--predominately Hisun, Linhai and Odes:
Chongqing Rato Technology Co., Ltd. [2017-2019] (RATO Carts also branded as Massimo Mini-ATVs);
Chongqing Huansong Science and Technology Industrial Co.,Ltd. [2015-2018] (Hisun also branded as: Coleman, Massimo, Bennche)
Shandong Liangzi Power Co., Ltd. [2018-2021] (Odes also branded as: Massimo , Lil' Pickup, U-Storm) -- the latter two seem to no longer be with us;
Taizhou Nebula Power Co., Ltd. [2017-2020] (REO Carts also branded as: Massimo);
Jiangsu Foma High-Tech Power Machinery Co., Ltd. [2020-2021] (branded as: Massimo
Jiangsu Linhai Power Machinery Group Co., Ltd. [2017-2021] (Linhai also branded as: Massimo);
These last two are "joined at the hip"--it seems "High-Tech Power" is a new subsidiary (or just a marketing arm) of the "Power Machinery" group.
Hisun is the Chongqing Huansong Science and Technology Industrial Co.,Ltd. house brand -- Odes is Shandong's house brand: Linhai is of course Linhai.
Your MSU800 was made by Shandong according to the EPA's 2021 database (I believe it is the same vehicle as the Odes Dominator X2-ST -- they look the same):
Do you know if the parking brake (they stopped being "emergency brakes" in 1947) a single rotor on the rear axle input shaft, or mechanically implemented at each rear wheel?
And to what adjustment do you refer, handle position or pad clearance at the caliper? They are of course related, but often adjusted separately.
-cliff-
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¹ - I need to get their spreadsheet into a database so I can make a "Who Makes What?" listing by model name.