SOHC.co.uk Forums > CB750
Rear Brakes
Martin6:
As you may have seen, I'm recommissioning my new to me, CB750K6. The ignition and carbs are now sorted, just some fine tuning of the carbs. On a 25mile test the bike did well and ticks over evenly (once warm).
Apart from a pilot light bulb and a very slight front fork weep, neither of which are urgent, the final thing on my current list is sorting out the rear brake. When I apply the brake I get a pronounced pulsing from the pedal. The brake is unusable. The shoes were replaced a few years ago and then the bike wasn't ridden. So they're effectively brand new.
I'm going to have a look at them this afternoon. I think there's a bit of a technique to installing the shoes, plus some force. Is it possible to distort the shoes when installing them? Is there a way to check? Any ideas on what else might cause the pulsing?
Thanks, Martin
Nurse Julie:
I know that Trigger has had problems with DSS aftermarket shoe's, and check that the brake liner is not cracked .
K2-K6:
As above noted, likey the drum is at least distorted such that a tight spot (closer to the centre) is being felt as it passes the brake cam point which has the most movement in terms of how far the lining material is moved toward the drum.
Generally checking for corrosion on interior drum surface, moutN wheel without brake plate and then spin it with a screwdriver or something similar held very close to the friction surface will soon show if it's out of round.
As Julie mentioned, they do crack the lining surface ring sometimes. May just show in spoke tension too, so check them as well.
Martin6:
Hopefully this picture posts. A fair bit of rust and wear ridges. What do you think, beyond salvage?
The hub looks ok, the rim and spokes are recent and in good condition. Is it possible to get the drum re-lined? If so, any recommendations on where to go?
Martin6:
The offending article :)
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