I am finishing up my granddaddy project. I have the MCP disc brakes installed and bled ( I think). There seems to be good pedal, but I can’t lock up the rear wheels. I am using a fair amount of pressure on the pedal (more than the grandkids will be able to apply) but the wheels will not lock up. The pads are moving. Any suggestions? I assume they should lock with not excessive pedal pressure. Thanks