What's going on with the sticky rear brakes?

Dear Car Talk | Mar 01, 1993
Dear Tom and Ray:
David
RAY: My guess is that your wheel cylinders are sticking.
TOM: Try an experiment. Next time the brakes lock up, climb under the van and open both rear bleeders. If that unlocks the brakes, then my brother is wrong. That means you have a problem further up in the system, like in the proportioning valve or the master cylinder.
RAY: But my guess is that opening the bleeders won't do anything. And that means I'm probably right, and what you need are new wheel cylinders
TOM: By the way, David, my brother used to drive a Dodge just like this, but he kept running into problems with people following the instructions on the back of the vehicle.
RAY: Yeah. People would drive up and see the sign on the back that says "Ram Van," and then smash into me.
David
RAY: My guess is that your wheel cylinders are sticking.
TOM: Try an experiment. Next time the brakes lock up, climb under the van and open both rear bleeders. If that unlocks the brakes, then my brother is wrong. That means you have a problem further up in the system, like in the proportioning valve or the master cylinder.
RAY: But my guess is that opening the bleeders won't do anything. And that means I'm probably right, and what you need are new wheel cylinders
TOM: By the way, David, my brother used to drive a Dodge just like this, but he kept running into problems with people following the instructions on the back of the vehicle.
RAY: Yeah. People would drive up and see the sign on the back that says "Ram Van," and then smash into me.
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