Bright Eyes (1934) An orphaned girl is taken in by a snobbish family at the insistence of their rich, crotchety uncle, even as her devoted aviator godfather fights for custody.
A loose parking brake is another symptom of bad or failing brake shoes. For vehicles equipped with drum brakes, the brake shoes are what hold the vehicle in place when the brake is engaged. If the shoes become worn or dusty, they may not be able to hold the weight of the vehicle without slipping.
Also as with the case of drum brakes the return springs installed on the brake shoes will collapse the slave cylinder where you would not have co ntact from the shoes to the drums with just one push on the pedal. With 10 psi residual pressure held, the shoes are held close to the drums for instant braking on the first push of the pedal.