Rear Brakes locking up

JBurch said
It's a good idea to go around all four corners to check and readjust; question I have for you is; have you just done a bunch of brake work?? Master cylinder, wheel cylinders? If so, is the master cylinder really a drum brake MC, and what size are the wheel cylinders? You're dealing with hydraulics, force over area, if the wheel cylinders are a larger diameter than original........even though parts book says it's the right one.....the larger surface area of the piston will generate more force on the shoes and cause lock up.

It's a long shot to be sure, if you haven't done any brake work forget what I said; if you have it gives you something to think about.

Good luck, be safe.

I re-adjusted the brakes which helped a little bit. But i think you may be on to something. The replacement wheel cylinders are 33597 at autozone and say they are 15/16" bore. The casting number i pulled off the old ones is 3461776 and when i cross reference that it comes up with 13/16" wheel cylinders. I am thinking that that extra 2 16ths could make a huge bit of difference. I was also wondering about my MC. I see some kinda confusing information on it and want to know what kind i have. I know this car has been messed around with a bit. Here are pictures of my ratty MC. I have read that this doesnt mean that it is for front disc brakes as long as it doesnt have the RPV in it.