Brakes locking up

[Osoroho]

I have a 70 Super Bee 440 4 speed the brakes will lock up for no reason that i know of it has drum brakes we replaced the master cyl no change i am stumped please help i do not have enough hair to pull any more out

 

[RemCharger]

Usually due to contamination. Like axle seal leaks, wheel cyl etc..

 

[MoparLeo]

You need to pull the wheel(s) that are locking up. As said could be lining contamination or even broken/loose brake part.

 

[69 Sleeper Bee]

Front or rear brakes ?

 

[dadsbee]

..we need a lot more detail...

 

[JMILL67]

Yep, more info would help. Are you driving and the brakes lock up without touching the pedal? Lightly applying the brakes and they lock up? 1 wheel, 2 wheels, all 4 wheels, fronts, rears?

 

[Geoff 2]

[1] M/c piston not fully retracting will hold brakes on, heating them up; makes them very touchy.
[2] Brake shoes adjusted too tight, get hot, as above.