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That'll be the outer settling into the stops, plus some deformation if the ends weren't cut completely square. This and Tester's inner cable stretch will both be dealt with better by a few harder squeezes than by just holding it on.
Parking brakes don't need as much cable tension as peak braking load.
I'd use a cable-operated parking brake separate from the normal brakes, where I prefer hydraulics.
Emyr
A question about cable stretch.
We have all ability cycles with a hand break that we can stick on which holds the brake lever in the locked position tensioning the cable.
Colleagues have suggested that we shouldn't leave the cycle with the handbrake locked on when the cycle is parked for the night/week as it stretches the cable.
So my question: Is it good to stretch the cable using by doing this so long as we compensate and tighten the brakes each time until it has completely stretched. And when its stretched does it matter if we leave the handbrake on for long periods as it is unlikely to stretch any more?
Is there a difference if the brakes are hydraulic? Most of them are cable disk brakes