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Play in brake lever

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Trigger:
The pivot bolt gets worn and also the bush in the lever  ;)

McCabe-Thiele (Ted):
If you look at the tip of the lever where it pushes down onto the end of the master cylinder what is the gap difference before you start to pull on the brake lever?  However good the rest of the lever pivot is that play has to be taken up before the brakes start to work.

If that gap is say 2-3 mm by the time you multiply by the length of the actual leverage taking into account the length of the lever at the action end - call that around 70 mm you end up with some 14-21 mm of movement even with no pivot wear.

If my rough mathematics is wrong I am open to a better estimate.
I suspect back in the day as long as the brakes worked once the play is taken up with plenty of available travel before the lever meets the bars that was fine.

Mikep328:
I have no issue at all with the point at which the brake lever actually starts applying force to the piston and braking begins.   Maybe I'm just being unnecessarily anal worrying about play in the lever but it just doesn't look right to see the lever not fully against the stop when the brake is "off."  Does that anti-rattle bushing force the lever to stay in the fully open position when not being used?

Nurse Julie:
The pivot bolt and the bush, when in non worn condition, just stop the lever chattering. By what I can remember of Hettie, my 400/4 she had a couple of mm gap where you're talking about. You may have an aftermarket or wrong model lever fitted.

Multiman:
Re bush material, as always I live and learn.
Anyway after overhauling my front brake I can make the tyre squeal which I couldn't before.

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