I got a cheapo bike pump (i'm gonna upgrade) but in the meantime for the next couple of days when I use it, it's got a lot of resistance and no air goes into the tires. I'm sure its not the tires. I've placed the pump firmly over the schrader valve, and have also tried it on multiple tires. Any ideas?
If you pump it without putting it to a Schrader, or any, valve, does air come out? If yes, the thing that depresses and opens the Schrader valve might be busted and the air pressure generated is insufficient to open the valve. If that's the case, you can either try to fix the head, cut the head off and replace it, or replace the pump.