When I got on my bike yesterday, I found the left brake lever just flopping loosely. A hinge pin was missing on the caliper. Today I took the bike to the shop that sold it. They looked for a replacement part in their junk box but didn’t have one and will have to order it. To give me back my front brake, the tech put a bolt in the in hole and tightened it with a set screw and that will hold till they get the proper part.