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PhilDAS-
Fluid boiling is more likely to seize a system than mechanical failure. Mineral oil also has a lower boiling temp than DOT fluid. So Shimano etc etc. Smaller rotors also dissipate heat slower, so whole system has a higher chance of failing. It's why Vehicles use DOT 5.1
Mechanical disc is still a better option for a tandem.
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What difference does that make to the pads?
None - in certain circumstances the fluid goes before the pads do. High ambient temperatures don't help either.
Chak
Howard
Hydraulics tho?