I've got a 00 Yamaha YZF 600r
Let the girlfriend ride it for a month or two while I was out of town, and I dont know what happened but when I got back I rode it and
THE FRONT BRAKE IS REALLY WEAK
and has close to no stopping power

can someone please give me some advice
im far from a mechanic but I need this fixed, ( !!! it's a big time safety hazard !!! )