If it’s that loose buy a new one. If it’s the unit I’m thinking of they are a poorly designed and dangerous piece of junk IMHO. If that little adjuster nut fails you loose all brakes. I wouldn’t use one. The one I designed is a simple block of aluminum that holds the brake rods and you adjust the front rod with a jam nut. You can’t set the bias on the fly but it won’t fail either.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience