Brake cylinder

Mark Cooke · Dec 31, 2017

Need advice on Series 3 SWB 1983 brake cylinder. Pressed the brake when the drum was off and the cylinder popped out as attached photo. Is it repairable?

dag019 · Dec 31, 2017

It may be as long as the seal is not damaged. If you carefully remove the cylinder, and fully inspect the seal. If it is still in good condition you may be able to carefully replace the piston without damaging the seal. Refit and test for leaks.

rob1miles · Dec 31, 2017

Take it out, clean it all carefully then refit it but as the seals are very cheap I would fit new seals. Lubricate with a little brake fluid when you assemble so the seal doesn't catch. You can hone the cylinders but they are not expensive and its hard to get them clean after honing without taking them off so once you do that you may as well fit new. Once brake fluid gets on the dust cover they can swell so you may have to get a seal kit as it comes with the dust covers.

Gmacz · Dec 31, 2017

Before playing with the seal, check the bleed nipple will move. If seized or if it snaps you will have wasted your time. If in a hurry refit seal if it is clean and undamaged otherwise fit a new cylinder. Wd40 on the pipe union and let it soak.

oxides · Dec 31, 2017

If you're stuck take the cylinder off, (if it will come off without damage and the bleed nipple will free off) clean thoroughly and refit the piston, using clean brake fluid as a lubricant. That piston looks rather scored and corroded so I'd replace the whole lot sooner rather than later.

Blackburn · Jan 1, 2018

Worth buying a little pot of red brake grease to lubricate seal and around inner of cylinder after refitting piston.
https://www.ebay.co.uk/sch/i.html?_...ase&rt=nc&LH_PrefLoc=1&_trksid=p2045573.m1684

Brake cylinder

Mark Cooke

New Member

dag019

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rob1miles

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Gmacz

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oxides

Well-Known Member

Blackburn

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