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Master Cylinder Screws


Dynamo_Delboy
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So, im about to service my bike & gonna top up the brake fluid in the front master cylinder.

The problem is.... The screws have rounded as they must be very old (obviously never changed by previous owner).

So my problem is, how do i get the feckers out?

Dont want to go and buy a new master cylinder.

Any help would be great thanks

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  • 2 weeks later...

Well i finally managed to get the screws out and new ones in along with a wee top up of brake fluid.

What i have now noticed is that when i pull the front brake i seem to have a leak of break fluid between the master cylinder and where the brake lines connect to it. Looks like theres a washer between them. Could that be worn and causing the leak?

Thanks again for the help :)

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Your correct there are washers there, try nipping them up first without stripping threads. I would say that if you think the fluid has not been checked for ages as the filler screws seem to suggest. Then better you flush, refill and bleed the whole system. A top up is not really the way to go, there's old oil still in the callipers.

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something I learnt not so long back


you dont have to replace the copper washers you can heat them up till they glow red and drop them in water to cool them and they are good to go again


just for any cheapskates out there :lol:


but as said try and nip the banjo bolt up a tad if no joy replace the washers


and also replace the fluid while your at it as chris says although I would drain the system I would just flush new fluid through this saves getting any air in the system and struggling to get it out :)

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something I learnt not so long back


you dont have to replace the copper washers you can heat them up till they glow red and drop them in water to cool them and they are good to go again


just for any cheapskates out there :lol:


but as said try and nip the banjo bolt up a tad if no joy replace the washers


and also replace the fluid while your at it as chris says although I would drain the system I would just flush new fluid through this saves getting any air in the system and struggling to get it out :)

Agree Stu, flush through with new oil not an agent. I would of thought that all the hammering and banging trying to get the screws out has cracked a joint. A tiny spot of copper slip on the screws for the the filler cap will prevent a reoccurrence of the seized screws

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stu i used to run a yam xt500 with loads of engine work done to it making it almost race spec and that used copper head gasket u heated that up in oven untill it had rainbow effect when running a match stick over it then cooled rapidly then reused it i refitted it at least 8 times that i can remember without any problems :D

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