Clutch master cilinder rebuild problems.

paso144 · Post by **paso144** » Mon Aug 20, 2007 9:00 pm

Hello paso friends,

I have a question regarding the re-assembly of the master cilinder of my clutch. Being in the possesion of a genuine workshop manual I thought this would not be that difficult seeing the clear picture of the inside. So I didn't pay maximum attention when taking it appart (very stupid). Now it seems that the master cilinder I have is different then the one in the manual (maybe I'm misinterpreting the manual). It could be replaced but more likely the first Paso series are equiped with a slightly different type. Mine is a very early model (no. 144, so probably produced in '86).

The following link shows the parts that are inside my master cilinder the white plastic sealing bus and thin rubber sealing cover for dust aren't pictured:

http://www.box.net/shared/12ncrhhcl0

As you can see this cilinder contains less parts then the one in the manual. The used sealing rubber looks the same as the rubber in the picture of the rear break cilinder in the manual. The push rod sits directly in the piston. This piston also looks longer then the one in the manual and contains three small holes in the flange.

I believe it's a standard Brembo PS13 cilinder but I can't find a cross-section or assembly picture of it on the net. Also the Haynes manual shows another type (just the workshop manual picture). So if anyone could help me how to assemble the thing (especially the rubber, wahser and retainer) please let me know. Or maybe some one has some pictures of drawings of the system.

greetz Remko (Paso144).

Post by **paso750** » Tue Aug 21, 2007 9:38 am

I guess you`ve seen:

http://forums.ducatipaso.org/viewtopic. ... cle&sid=26

(sorry, no idea if it`ll help. Last time a pump broke down I got a new new one)

G.

ducapaso · Post by **ducapaso** » Tue Aug 21, 2007 5:41 pm

It looks like a rear brake master cilindrer!
It's the same thing to rebuild it

Of course you need a good grease to rebuild it and be careful not to damage the rubber when you install it.
The rubber seal/ring must be put around the drain in the master piston, the face you can see in your pic must look at the spring;
in the "petcock" of the master piston, put first the metal washer then the plastic ring and the spring.
Put the ensemble in the cilinder, be sure it moves correctly up and down without seizing and push it in with a screwdriver.
You should have a lock spring too (or a seeger) to block the piston inside , so as described in the article that paso750 has indicated.
when you reinstall it in the bike, leave the screw on the banjobolt not completely closed, in order to bleed it (it's the first and the last place where the air bubble stand!)

paso144 · Post by **paso144** » Wed Aug 22, 2007 7:16 am

Thanks Paso750 and Nicola,

Still a few clear pictures or cross sections of the system would be convinient. But I'll give it a shot with your discriptions. As a matter
a fact I believe I've tried you're setup Nicola but that didn't give a good feeling in the handle, should try it with grease.

greetz Remko

zap · Post by **zap** » Sat Sep 01, 2007 8:10 pm

hallo landgenoot!

ik heb er anders nog wel een paar liggen, heb ze vervangen voor gouden brembo's.

geef me maar een pm als je interesse hebt.

groet, ab.

told him i got one for him...

paso144 · Post by **paso144** » Mon Sep 24, 2007 7:49 pm

Hey guys,

Thanks for all the help. I did a revision and the hydraulics work fine again. Although it has turned out not to be the actual problem. The clutch control disk is broken (see post). Gained some experience however which always comes in handy I guess.

regards,

Remko