Luca03

My mechanic fixed it yesterday and thought my calipers had ceased. Which wasn't the case, he realised it was a transmission problem, was stuck in 4wd. He fixed it, then last night some moron decided to slam on his brakes which caused me to do the same and soon as it happened, it felt like my front tyres were in lock and it didn't want to move. Back again in 4wd. PLEASE HELP! what could be the issue? Anyone have this problem before.?