Well I've made this post before and I never got any help. My bike was in the shop for 2 months and the bicycle mechanic never touched it. Now I'm stuck with it again. When I try pushing down on the lever, it won't do anything. It has nothing to do with the tension screw. Does it have something to do with the High & Low Limit screws? I don't understand those things. Help and advice would be greatly appreciated! Thank you guys for your time!