Brake Master Cylinder removal issue

[Anonymous]

1956 11BL – My problem is that I am trying to replace the brake master cylinder however the top fixing has a thread with a nut on it. I try to loosen the nut but the thread turns at the same time. On the bottom fixing there is a bolt (reverse of the top) but it to simply turns in situ and does not come out. Any suggestions are welcome…

Thanks in advance,

Richard.

[BernieParticipant]

Richard,

The ‘threads” are the ends of bolts inserted from the cylinder end and your problem is that the heads are not anchored and the bolts can turn.  You will have to access those heads to hold them unless there is enough free thread after the nuts to enable you to hold that initially and then hold the exposed thread behind the nut once it has moved enough?

When you finally replace the master cylinder weld a small bar – say 3mm dia and 25mm long –  across the top of the bolt heads so that it will interfere with the cylinder body and prevent the bolts from turning.

B…..

[BernieParticipant]

Richard,

I have just reread your post …. the hottom bolt has obviuosly been put inthe other way round so you ideally need to hold the nut to undo it.

You might be able to get something under the head to pull it towards you as you turn it, thus pulling the nut harder against the flange at the other end where friction might perhaps stop it turning.

Bonne chance.

B……

 

[Anonymous]

Bernie,

Thanks for the swift response, I’ll let you know how I progress.

Richard.

[Larry LewisParticipant]

The bolt heads are inside the car by the brake pedal. It’s a pain to do by yourself, best to have a helper. The bolts should be inserted from the interior.

[Author]

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