94 toyota front brakes locking up

[butler239]

Hey, driving my toyota one day all of a sudden it started slowing down and curving to the right. got to my destination to find myself in 1st gear pinned to keep it moving. stoped and looked at the right brake and the rotor was red hot smokeing. let it cool down for a few hours and it was fine until about 4 miles and it started doing it again. next day i drove it and it did the same thing... but now both front brakes were locking up this time.
i bled the brakes, still locking up.
checked the pads and rotors seem to be fine.
the lines aren't swelled.

not sure what to replace next, was thinking the master cylinder.

[huntinyota94]

i would say your caliper is bad

[seth999]

does it have a residual pressure valve for the front brakes that could be bad? I wouldn't think it is the master cylinder or they would be both doing it the whole time or like he said try the caliper