>>17699742" mtb tyres would handle that with zero problems, you wouldn't need sus and eve if your bike had it you would likely just lock it out and choose good lines, staying away from the centre and gravel troughs.
>>1770103If it's mineral oil, you'll probably have some water settling in the bottom of the system (i,e: the caliper)
If it's DOT, your fluid's boil point will be lower than spec and you'll have fade under sustained braking.
Just bleed them anon, it's not difficult or expensive at all.
