YES, happened on two separate vehicles, my 64 4 speed plymouth and a 62 dodge auto. Now both times I was going 30 mph and getting ready to make turn, both times the rear rubber line to axel broke. A little understanding here, with drums in the back the cable acts the same as pushing the brake pedal (it has a LONG arm for better leverage force). When disc brakes are used there’s a tiny set of shoes inside the disc, real good for holding a vehicle at rest, not to good for emergency situations. The mechanic next door just replaced the complete assembly on 2001 Dodge mini van where the guys daughter left the emergency brake on. Only one side was engaged, she said she had to keep the gas pedal flooded to get back home, NO CLUE what the problem was. Fried the drum, burnt the linings off the shoes, smoked the wheel cylinder and warped the backing plate. She did add it got easier to get up some speed after awhile (linings gone).
BUT even in the new cars your ‘parking brake’ WILL STOP YOUR CAR IN AN EMERGENCY.
One more thing, not sure of back in the day if the car companies were lawyered up like today for lawsuits but saying it’s a parking brake let’s them off the hook if said device were used in an ‘emergency’ situation that didn’t end well. It’s all about correct ‘wording’