I Recently replaced my Master Cylinder and my Brake Booster because the old ones wore out due to age... i changed the check valve and hoses also. I finished bleeding the brakes and i drove around for awhile, then i slammed the brakes to check them and the front driver side locked up. This one was giving me problems before and i never got around to fix... my rex was sitting in the yard for over a year. What can it be? Im thinking the brake hose connecting to the caliper is clogged. any ideas?

 

the left front locks up only?
IF the left front only locks up that means the right front caliper is not working properly. That is what I recomand is check the right front

 

if the LEFT front locks up... the RIGHT front caliper is bad? are u confused or ur for real?

 

yes because the left caliper is doing all the braking because the right front isnt working?

Try to bleed the brakes again to see if that fixes it.