Technical 100HP clutch master cylinder - slight confusion...

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Technical 100HP clutch master cylinder - slight confusion...

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It seems nowhere stocks one, but they do for the 1.1, 1.2, MJ etc. I assume it's the same part? (FIAT 55187040). Or is it uprated due to the (presumably) larger clutch in the 100HP?

Also - it's still operating fine, just a drop of fluid forming on the pedal side of the cylinder. Would I get away with swapping an O ring, if that's even possible?

Finally, if I do need one, I can't find anywhere cheaper than s4p (£116.76 delivered). I know the forum's version of the ePER is getting on a bit, but it's almost double the price! (£58.88). Any suggestions for where I can get a new part for a bit less? Apparently 2009-on Ford Kas use the same one?
 
My bad - it seems the unit fitted to the 1.3 MJ has the pot farther away from the master cylinder on a longer hose. The one in the 100HP right now looks identical to a new one for a 1.1/1.2 8v, though I'd appreciate any clarification on it being the same unit (please!)

I still can't find a better price than s4p (except maybe a quid or two)... that sort of price increase over a few years is appalling!
 
My bad - it seems the unit fitted to the 1.3 MJ has the pot farther away from the master cylinder on a longer hose. The one in the 100HP right now looks identical to a new one for a 1.1/1.2 8v, though I'd appreciate any clarification on it being the same unit (please!)

I still can't find a better price than s4p (except maybe a quid or two)... that sort of price increase over a few years is appalling!


Can't imagine them being different, but when my Lancia master-cyl went years ago I just bought seals. And I bought them for a Lada as I knew they were also hydraulic and figured would be the same.


Perhaps one of the ebay breakers will sell you one cheaper......
 
I'd seen the few on eBay... tempting, but a used one could be as bad.

My ePER, dated 12/6/12 shows the same one for all petrol models, 55187040. Price then was £109.

The diesel has two others, one normal the other for the 4x4. So not for you.

Thanks for confirming that for me :)
The forum's version is old enough to not have the 500 on it, so yeah. Fiddling a newer version to work over the internet is probably a pain in the bum.

(still though, that price hike...)
 
You could always swap over the feed pipe & reservoir from your existing cylinder if those parts are in good condition


For the price of a rubber washer, I'd try that first..........


Never looked but presumably accessing the master cylinder requires you to contort into a hellish version of the game Twister.
 

I had noticed that about the Ka ones, yeah... I believe the current shape ones use the 500/Panda platform so perhaps it'd make sense for them to share bits and pieces like this but I can't guarantee it's the same. I'm still a bit vary that a used one might not be any better leak-wise, too.

For the price of a rubber washer, I'd try that first..........


Never looked but presumably accessing the master cylinder requires you to contort into a hellish version of the game Twister.

Sort of. You can get a picture easy enough, trying to service it in-situ is probably dependent on your how flexible you are. Or if you have a lift that could bring the whole car up.

Though taking a couple of pics make me realise... how do you get a new washer over the joint that connects to the pedal? You can't. Scuppered my own plan from the first post. :doh:

The fluid is coming out of the tiny air-release hole in the dust cap. After 45 miles today there was the tiniest speck of fluid (pin head size). Maybe it's one of those things that seems like it's not an immediate threat, but it could suddenly give out.

The reservoir had a little sediment in it. Perhaps that's an indication of the condition of the seal, if that's where the muck got in. The clutch was and still is operating fine, for now.
 

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The leak from the airhole is slight because the hole is small.
New seals would be fitted over the other end of the pushrod, once the cylinder is dismantled, but that would depend on seals being identifiable and available. Quite likely to be standard sizes and design, same as all the others from the same manufacturer, but sourcing them might be difficult.
Not really a good plan if you don't know what you're doing.
 
My goodness, there's some rusty bits up there! I realise they're really thick metal so not likely to cause an issue but it's surprising considering that this is the inside of the car. Do you live at the seaside? Don't think I want to look at my car in case I see the same!
 
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55225453 is listed for the Twinair and the pics look different to the 1.2 ones, which include the reservoir and pipework.

However, it is also listed for the Abarth, which uses the 1.4 engine. However with a turbo space restrictions may have forced a different design.

Sadly my ePER suggests that it will be different. But good luck, if it is similar, and can be made to work, let us all know. Important considerations as well as actual fitting is bore size and plunger travel.
 
Success (y)

Battery and tray out, drain, swap both (slave was squeaking, swapped for one of 645580100 from eurocarparts), bleed through, battery and tray back in... maybe 2.5 hours at most? Pedal is at the same level as before. Drives fine, and with the engine running and clutch in gears can be selected with no crunching or grumbling. Using all the existing pipes.

Pictures of the old and new ones attached. Existing unit was a 55187040, 55225453 seems to be identical.

Radio remembered its settings, maybe the stock Blaupunkt unit has a big capacitor in it. Still had to reset the dashboard clock, and the trip data was gone.

The bolt holding the little reservoir to its bracket wasn't loose, but not as tight as you'd expect. Plus a zip tie holding the opposite end of the rubber hose to the master cylinder. Both perhaps indicating it had already been swapped once?
 

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No problem. Out of curiosity I took a mirror to get the part number from the master cylinder on my mum's Panda (same-shape 2011 model... 1.2 8v 69hp, euro4 I think due to the annoying low £30/year tax :p ), thinking maybe 55187040 had been replaced by 55225453 in the newest catalogue.

Turns out it's a third one, with a completely different part numbering scheme: 5025-0H30-00. Hmm.
 

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For a few days my clutch pedal had begun squeaking. So there I was in a stop/start queue, when the pedal stuck down. Thumping it brought it back up again, and it worked ok the rest of the journey.

New master cylinder, from the link above, £60, plus a new slave from carparts4less at £17, pot of fluid and all done in a couple of hours. All working fine, very light pedal now and all quiet.

The 500 cylinder from the above link seems identical despite its different part number.

So thanks to Blue Dan for taking the first risk, seems to be the way to go.
 
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