Just to toss another cause out there... Mine used to lock up one rear wheel after the brakes got heated up from driving and never when cold. I found the cause was a stuck emergency brake cable.
It was making the brake stay on just a little bit. This made the brake heat up and get sensative.
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Bob
63 Impala 283/PG/3.36 (under restoration)
66 Impala 327/PG/3.36
66 Chevelle SS 409/M22/3.55
69 Chevelle 307/PG/3.08 (future restoration)
69 C10 short stepside 454/TH350/3.73
69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!)
71 Cheyenne 20 fleetside 350/4 spd/4.10
71 Chevelle 6/PG/3.08
72 Chevelle 454/M21/4.10
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