At minus degrees temperature my rear brake on my Radrhino 5 got stuck. This obviously is caused by the break cable hull ends upwards at the rear brake without a sealant. So water enters the hull and freezes at minus degrees within minutes.
Quite dangerous.
I solved this by funneling some defreezer into the hull and and sealed the enpoint with a chunk of lubricant.
This morning at minus 5 degrees breaks worked flawless.
I don't now if this same flaw exists at the new Radrhino / Radrover 6.