Straight Six brake master cylinder

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guybetts
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Straight Six brake master cylinder

Post by guybetts » Fri Sep 16, 2016 7:30 pm

I've got an original Girling master cylinder (0.875) and a rebuild kit I bought a good few years ago now. However, i'm having trouble dismantling it :oops:
The piston is free moving against the spring pressure, so on removing the circlip and retaining washer, I'm expecting the "innards" to come out - but they won't. There is no discernable ridge stopping the piston from coming out, and the manual (which is helpful to a point) suggests the piston and valve assembly can be pulled out :shock: How? There's nothing to get hold of.
The Coupe manual shows the later type master cylinder with integral reservoir, whereas the early type (mine) has a bolted on plastic reservoir. I wouldn't expect the innards to be any different. Any ideas how I get it apart ?

Guy


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Re: Straight Six brake master cylinder

Post by Oaksey » Fri Sep 16, 2016 7:32 pm

I normally push the piston down with a screwdriver or something then release. The piston will come a bit further out each time until it's out all the way


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Re: Straight Six brake master cylinder

Post by roymck » Fri Sep 16, 2016 7:57 pm

Use an airline and blow it out



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Re: Straight Six brake master cylinder

Post by guybetts » Fri Sep 16, 2016 8:13 pm

Oaksey wrote:I normally push the piston down with a screwdriver or something then release. The piston will come a bit further out each time until it's out all the way
I've done that quite a few times but to no real effect.
roymck wrote:Use an airline and blow it out
I was coming round to this idea as the final straw :?

I've only experience with rebuilding one master cylinder before, and don't recall that being any problem at all.

Thanks for suggestions :)


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Re: Straight Six brake master cylinder

Post by toomanysabres » Fri Sep 16, 2016 8:43 pm

Put a bit brake fluid into the open end. Hold in one hand and whack the open end with a wooden mallet or similar NOT metal hammer. The shock should shift it towards the open end. If it moves push it back a bit and hit it again. Very soon you should be able to pull it out.
I did this only but the other day with an apparently completely seized Zephyr clutch slave cylinder and it doesn't have a spring to help.


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Re: Straight Six brake master cylinder

Post by Coupe Racing » Sat Sep 17, 2016 9:57 am

Push the piston in as far as it will go , clean the bore , then lubricate the bore , and release the spring pressure as quick as you can.

It ought to pop out and possibly bits fly everywhere if you are lucky :twisted: :D


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Re: Straight Six brake master cylinder

Post by guybetts » Sat Sep 17, 2016 6:32 pm

toomanysabres wrote:Put a bit brake fluid into the open end. Hold in one hand and whack the open end with a wooden mallet or similar NOT metal hammer. The shock should shift it towards the open end. If it moves push it back a bit and hit it again. Very soon you should be able to pull it out.
Worked a treat :D
Thanks


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Re: Straight Six brake master cylinder

Post by guybetts » Sun Sep 18, 2016 8:58 am

Now discovered the service kit I acquired some years ago is not the right one :(

Ordered a new kit at a significantly inflated price over the old one :roll: There was a time once when Ford Cortina mk1 parts where cheap as chips, and then everything for a mk1 became Lotus Cortina prices - even if they were never fitted to one :wink:


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