Dude, as you mentioned, u are clearly facing the problem of unequal brake force distribution. Ur car doesnot have the ebd feature or the abs, both of which prevent unnecessary wheel lock ups.
well, there could be several reasons behind this.
-U mentioned u got brake pads recently changed. Then, is ur brake system properly bled? If one brake is properly bled and the other has air in it, then one will have greater grip than the other, henceforth resulting in a lock up.
-What shape are your rotors in? Rotors often get rust. In most cases they are not bed properly. The most common areas are the outside diameter and inside diameter. Make sure you check both the outside and inside surfaces. If one rotor is in better shape it will brake properly, and the other one won't give you as much grip.
-Is one caliper dragging? If so it will cause one brake to be hot and the other one to be cool and you will get uneven responses. A caliper can drag because the weather seal (boot) has failed and is letting water contact the piston so it rusts and does not retract. The caliper guides can be dry and not allow the caliper to float properly.
Get ur calipers and the seals lubricated properly in case they were not treated like they should've been at the time of changing the brake pads.
-Did u get ur flexible lines checked? they move when brakes are applied and a weak flexible line can cause uneven brake force to be applied on that rotor...
Other reasons could be a misaligned chimta, some bad bushes in ur suspension system, and may be u need to get camber adjustment.
well, for now bro, thats all I could think and search of right now.
Waiting for fahad bhai. He has got ample knowledge when it comes to brake systems...