2000 intrigue break lock and water on the back seat

hello everyone

some time while driving my breaks lock when i hit the break pad and on the same moment i heard strong sound like the breaks is not catching anything or stuck after i move my feet away from the break pad everything back normal
it happen every often
my breaks are new been replaced before 1 month

my second problem there is water show up on the back seat passenger side any idea or solution what is it this water start showing up after i fix the code p0410

the only error code who show up at the scanner machine is p0420 ill use sea foam trying to fix it i hope it well work

thanks