It more than likely catches when you go over some uneven roads or bumps, it doesn't take much to rub the outer layer off, mine on the passenger side on my celica has been catching on the wire for the abs sensor and has started to rub through, I have put some duct tape over mine to see if it still catches, should be fine to use as it's only a outside coating, there should be an inside tube, the stainless protects that and then the outer layer. Just keep an eye on it, see if the hose can be adjusted, it looks like it might need twisting either forwards or backwards to bend it out of the way, but you will probably have to undo one side of the hose to do it and then re bleed. Iif it catches anymore then eventually it could rub through causing you to leak brake fluid and losing your brakes, only a chance doesn't mean to say it will.