Quote:
Originally Posted by Old Tele man
"...dragging just a little..." could refer to either:
• disc caliper that wasn't retracting.
...or...
• drum shoe that wasn't retracting.
...which?
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Either way, it's the same physical defect manifesting itself. The rubber inside the brake lines degrades and swells up until the passage through the line is actually pinched closed. Stepping on the brake pedal generates hundreds to thousands of PSI of pressure, so liquid can still push past the pinched area to the caliper or wheel cylinder, resulting in normal brake operation. However, when the pedal is released fluid only flows back until pressure at the caliper/wheel cylinder drops to the point where it matches the restriction that the collapsed hose presents. That means a certain level of residual pressure being applied to the brake, even when the pedal is released.