Brake problem

[CaribbeanYJ1918]

Hi
I have just put a new master cylinder in, I am getting problems where the brakes go hard and don’t stop the jeep properly, or they will go soft and I have to pump several times .
I have also noticed my drivers side rear tire locks when the brake goes hard.

Anyone ever had these problems before?

It’s on my 1989 YJ

 

[T-Rex Jeepster]

Drums on the rear?

 

[T-Rex Jeepster]

Oh forgot.....Did you bench bleed it?

 

[CaribbeanYJ1918]

Drums on the rear?

Hi
Yes

 

[CaribbeanYJ1918]

Oh forgot.....Did you bench bleed it?

We did bleed, but I have ordered proper bleeding kit