Brake problem; Is this mastercylinder problem

[SD1too]

Originally Posted by Fred Byrne

The piston will not move back any futher so it must be the seals that are blocking the ports and not allowing the wheel cylinders to re-charge.
Are there any suggestions please?

Hi Fred,

Once upon a time a repair kit comprising the items within the dotted line (2) was available:


Diagram provided by Motaclan.

This suggests that it's possible to detach the reservoir from the cylinder. If you do that, you may have access to the seals which you suspect are the cause. They may have just been "flipped" if excessive bleeding pressure was used in the past.

Simon

[Fred Byrne]

Hi Simon;
I have got the reservoir off. The onlyway I can access the interior is to remove the circlip at the end of the cylinder facing the servo. This looks difficult but I'll have a go at it tomorrow. I have nothing to lose.
When I blow into either of the outlet pipes there is total blockage and ditto when I bow into the reservoir. The piston is hardup agasinst the circlip so obviously it is as far back as it will go. I feel roughness at one point when I push the piston in by hand and that does not bode good methinks.

My ancient Rover '100' is so much easier and has taken over routine duties once more. If it could speak it would say " told you so; these youg 'uns have a lot to learn from us oldies"

Thank you as always for your interest.

Fred

[SD1too]

Originally Posted by Fred Byrne

My ancient Rover '100' is so much easier ...

It was my father's Rover 100 that started it all for me.

Simon

[Fred Byrne]

The Rover 100 is a magnificent car. I suppose your father's car is no longer on earthly roads. We were staying in the Fairmont hotel in Monte carlo a few years ago and the door man insisted on parking my car at the front door.. Doorman said someone might steal such a valuable car. Iit displaced a modern Bugatti which the door man told me were two a penny. Bugatti man was furious but the door man in Monte Carlo is king!
I have dismantled the master cylinder. The piston at the front end had jammed. This must have happened when the garage was bleeding the brakes after replacing the brake lines. When I reassembled it the front brake cylinder compartment recharged but the rear one didn't. I cannot see what is wrong. I attach pics.
Fred

[Fred Byrne]

I have decided the brake cylinder is beyond repair and have decided to replace it and also the servo unit. So into the scap it all goes. Many thanks everybody who took the time to reply but the brakes are too important. So that's that

Fred