Hey everyone,

Just tried connect up my clutch and the piston keeps seizing at the top of the clutch master cylinder....its not getting sucked back down when the pedle goes down....i have tried soaking the piston (from top and bottom) with brake fluid but it keeps happening!!!

any ideas????

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Hi-Ho Silver LS1275
Charlieeeeeeeee Come to Candy Mountain!

Has the master cylinder been apart?
Was the return spring inside the MC replaced when it was reassembled?

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

how long was it on the shelf. surface rust in the bore and the rubber is getting caught on it. take the thing apart, use some steel wool to give the bore a LIGHT clean.

as mentioned if the spring is worn replace it. might need to replace the rubber too.

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Aussie Leyland, Aussie Factory, Aussie Mini S.

how exactly do i take it apart?? from memory i cant remember actually seeing any bolts or anything that i could undo to get to the piston inside the clutch master cylinder??

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Hi-Ho Silver LS1275
Charlieeeeeeeee Come to Candy Mountain!

There's a circlip inside the bore which will release the contents of the master cylinder.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

how do i get to that circlip?? is it near where the bar that pushes the piston, which connects to the clutch pedal is?

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Hi-Ho Silver LS1275
Charlieeeeeeeee Come to Candy Mountain!

Take MC off car, emty it, turn it upsidedown, look down the mc pushrod (shaft that pushes pedal pushes into the MC), there will be a rubber boot over the top of the end of the MC where the shaft goes in. Remove the boot, it has an inner ring that slides up and down the shaft. Inside of where that boot was around the inside of the MC where the shaft goes in is where the circlip is. You need good needle nose pliers or circlip pliers to get it out. Then the whole thing will come apart.

If you've gotten this far then buy the correct MC repair kit which will have new rubbers etc and redo the whole thing. Be wary which way the parts come out, particularly which way the rubber plunger seal inside the piston itself goes.

Good luck!

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Lillee - 1969 Morris Mini K

Yeah, you will need to take the pin out which connects the master cylinder pushrod to the pedal, and then unbolt the mastercylinder from the car from inside the engine bay.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

wow this sounds .................nice and easy!

Ill give it a shot....i cant stuff it anymore then it is now i guess/hope

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Hi-Ho Silver LS1275
Charlieeeeeeeee Come to Candy Mountain!

Nar it's really easy, harder than it sounds. Describing it is far harder than doing it!

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Lillee - 1969 Morris Mini K

Sorry to jumpin on the thread.. I started to pull my tin pots apart so I can overhaul them,.,.... Managed to remove the dust cover, the C ring and then remove the plunger... however the dished Stopwasher seems to be stuck in the units.... have sprayed with Lubricant and tapped the bottom of the unit on a lump of wood however it wont budge... either there aint one in there or it is jamned or I am missing something....

Any Ideas?

Kevin

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MY MINI
Morris Mini Deluxe 1967 Restore - 100% BMW FREE
http://www.berdenweb.com/mymini

So it sounds like you removed the pushrod but the piston is still stuck yea? Try sealing the holes with a rag as you blow compressed air into the top of the cylinder. Make sure you have drained all the fluid out though, or you might just spray it everywhere, and wrap a rag around the cylinder so when the piston shoots out the rag catches it.

cheers mate, will give that a go, just annoying, both are stuck

Kevin

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MY MINI
Morris Mini Deluxe 1967 Restore - 100% BMW FREE
http://www.berdenweb.com/mymini

if you havent got an air compressor a thin bit of wire and try and poke it out from the top.

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Aussie Leyland, Aussie Factory, Aussie Mini S.

Tried the Compressor, didnt work, sprayed the unit all over with Inox..(like WD40 but better), came out a treat... Bore and piston look good.. Will look at putting a refurb kit in,... Where can I grab those from?

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MY MINI
Morris Mini Deluxe 1967 Restore - 100% BMW FREE
http://www.berdenweb.com/mymini