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Rear Brakes Locking Up When Hot

SiR_RB
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SiR_RB Grand Master

SiR_RB

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Took my car for a drive today and after about 20 or so minutes I could feel the car didn't want to roll, afew minutes later it got even worse to the point where I had to go from 4th to 2nd just to keep it moving

I stopped and smoke was coming from back brakes and pedal was hard

I let it sit for about an hour to cool and drove it back home no problems until I was just in my street and it started again

I took the rear pads out and I couldn't put both pistons in at the same time, it was asif somfin was stopping the fluid from returning

I'm about to change the fluid tomorow, can I be this? Or could it be the master cylinder?

Car is r32 Gtr with 33 Gtr brembos all around with braided lines, was like that when I bought it and have never changed the fluid in my ownership (9 months)

Any help would be great !!

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SiR_RB Grand Master

SiR_RB

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Pretty sure it's not the handbrake shoes because the rear brake calipers and disc surface where the pad goes we're extremely hot, I can see afew heat blisters on the caliper due to the heat

I'm gonna change the master cylinder and brake fluid today nd see how it goes

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