Clutch master cylinder Hydrlic clutch cleaning

[actungbaby]

Hi i just brought a second hand main master cylider for my Vfr 750 i got a repair kit for the slave seals .

still having no luck think there may be gunk in the workings . dryed brake fulid . whats a good cleaner to use .

I cleaned parts in the past been awhile i assume brake cleaner i looked at supercheap but there mentioning brake dust.

I just need something to clean the inner piston .

Thanks in advance

[OddDuck]

Yeah, brake cleaner is to be used outside the hydraulic circuit. It's mostly for cleaning brake dust off calipers, pots etc.

What's the issue with your clutch? Soft lever, not separating plates? Hard lever, a beast to work?

[AllanB]

Maybe blast it/soak it with some degreaser. I'd then flush the degreaser residue with brake cleaner followed by a flush with brake fluid.

[actungbaby]

Yeah, brake cleaner is to be used outside the hydraulic circuit. It's mostly for cleaning brake dust off calipers, pots etc.

What's the issue with your clutch? Soft lever, not separating plates? Hard lever, a beast to work?

always the lever did feeel not right but i cant say for sure because i never had a bike with this set up before.

changed gears fine . but since i replaced the clutch plates fine also but then its sat for nearly 2 years , started it up

And the plates seem to be sticking as even with clutch fully engaged rear wheel whould spin , making a clatter in netural

If i rev it up it goes away. come back on idle well it just stalls. the slave cylinder was leaking in the end though ditto other end too.

hence i replaced the seals in the slave cylinder on the engine.

[Akzle]

a 50/50 blend of brake fluid and elbow grease (and wire brushes)

[actungbaby]

a 50/50 blend of brake fluid and elbow grease (and wire brushes)

Thanks I was trying to bled the system it was getting down to the slave cyclinder then it stoped was getting to the bottom banjo bolt.

but not to the bleed nipple werid . so i undid the top bajo bolt on the master cyclinder . removed it and nothing drained from the res

really werid. so just to try to clean the return valve hole and the actual one for getting the brake fulid moving . i guess a small needle .

yes i cleaned the res before am pretty fussy . i have 3 master cylinders know and two bikes so anyone needs one ;-)

I try again in the morning .

[OddDuck]

This is sounding a bit weird. Banjos undone at both ends and still no joy... Oxidation or crud jamming everything up?

At this point I'd be thinking about taking the entire system off the bike and completely taking it to bits. That's just my 2c though, issues with OCD / perfectionism / curiosity etc.

[actungbaby]

This is sounding a bit weird. Banjos undone at both ends and still no joy... Oxidation or crud jamming everything up?

At this point I'd be thinking about taking the entire system off the bike and completely taking it to bits. That's just my 2c though, issues with OCD / perfectionism / curiosity etc.

yeah me also i have one problem some decent circlip pliers internal to get dam circlip out i brought cheap rubbish ones and there usless

dont fit i looked on ebay and there still rubbish ones . so i have been getting local guy bike shop to rebuild the brake master for me.

and getting a rebuild kit . i love to rebuild my own though.

[Akzle]

This is sounding a bit weird. Banjos undone at both ends and still no joy... Oxidation or crud jamming everything up?

At this point I'd be thinking about taking the entire system off the bike and completely taking it to bits. That's just my 2c though, issues with OCD / perfectionism / curiosity etc.

that was pretty much what i was assuming needed to be done.

small holes can be violated with one strand plucked out of yer wire brush.

[actungbaby]

that was pretty much what i was assuming needed to be done.

small holes can be violated with one strand plucked out of yer wire brush.

Yes i have to order a rebuild kit . i forget if i done the clutch one before but i see in the garage packaging for clutch reuild kit .

i no i done the brake ones before . sems werid clutch has gone already mind u been 4 years ;-) .

i let you know how i get one . oh for clutch levers as the clutch side has a push rod that fits into the lever . i assume most clutch

levers dont as there cable obpertated ?

[actungbaby]

Maybe blast it/soak it with some degreaser. I'd then flush the degreaser residue with brake cleaner followed by a flush with brake fluid.

Thanks Alan

[Drew]

Just ckean everything with brake clean. Then Get a syringe and push brake fluid in through the slave bleed nipple with the clutch lever pulled in just enough to open the return circuit.

[ellipsis]

The last master cylinder and brake issue I fixed was on my wife's ex CBX...couldn't get any pressure to build and remain , no matter how much cleaning, pressurising, poking etc I did. A new piston was fitted and I thought it was all at the banjos or elsewhere where it was failing to keep pressure. Turned out the fluid was getting past the piston in reverse so it ended up needing sleeving...had gone a bit porous the bloke who machined the sleeve said.

[actungbaby]

Just ckean everything with brake clean. Then Get a syringe and push brake fluid in through the slave bleed nipple with the clutch lever pulled in just enough to open the return circuit.

Very Good advice Drew thanks mate .i remember doing this before and oh what a pain it took ages to get air out the system.

I just removed the master of the bike filled it with brake fulid then held finger over the end to get air back through the bleed .

Know it getting to the slave cylinder but i misplaced my bleed plastic tubing so being a cheap skate i buy some more from mitre

Ten tommrow morning . and use a jam jar hole punched in the lid . am not paying for kit ten bucks whnen u can make your own ;-)

Yeah thought about pouring some fulid in the bleed hole on the slave but i make a real mess . so i see how it goes .

I have to get some carb clean tommrow as dumb me takes

the carbs of didnt he ;-) so have to have them on to get bike going . still after over a year am sooo glad i get to ride

one my motorbikes again. walking is getting to be a real pain and i cant see me using the pushbike much after ;-)

[actungbaby]

The last master cylinder and brake issue I fixed was on my wife's ex CBX...couldn't get any pressure to build and remain , no matter how much cleaning, pressurising, poking etc I did. A new piston was fitted and I thought it was all at the banjos or elsewhere where it was failing to keep pressure. Turned out the fluid was getting past the piston in reverse so it ended up needing sleeving...had gone a bit porous the bloke who machined the sleeve said.

Good god i know right i have no idea why clutch is worse than the brake side but it is . never mind once its done its done.

It does make me which was just like most bikes a dam cable ;-) got the engine out the cbr 900 rr dumb me takes the gearbox out

Just beacuse was making a whine . i buying second hand unit and build a new one from both mine and the other .

[ojyamaha]

Hi i just brought a second hand main master cylider for my Vfr 750 i got a repair kit for the slave seals .

still having no luck think there may be gunk in the workings . dryed brake fulid . whats a good cleaner to use .

I cleaned parts in the past been awhile i assume brake cleaner i looked at supercheap but there mentioning brake dust.

I just need something to clean the inner piston .

Thanks in advanceI got an ultrasonic cleaner off tme for my carbs and did my front brake master in it before I did the kit ... worked all good.

Sent from my SM-G920I using Tapatalk

[actungbaby]

I got an ultrasonic cleaner off tme for my carbs and did my front brake master in it before I did the kit ... worked all good.

Sent from my SM-G920I using Tapatalk

Sounds cool did alot of crap come out of the carbs i looked at videos on you tube about them . even home made ones .

Anyways I got new master clutch seals done yesterday got the kit cheaper from my local bike shop cheaper than if i brought of ebay.

Plus he had it in stock so awsome . clutch is great know . so it phew finish putting the throttle cables back and i can finally ride it again.

Did the Unit cost alot.

[ojyamaha]

Sounds cool did alot of crap come out of the carbs i looked at videos on you tube about them . even home made ones .

Anyways I got new master clutch seals done yesterday got the kit cheaper from my local bike shop cheaper than if i brought of ebay.

Plus he had it in stock so awsome . clutch is great know . so it phew finish putting the throttle cables back and i can finally ride it again.

Did the Unit cost alot.All the fuel deposits that had stuck to the bowls came off after about an hour in the cleaner . I used simple green in the cleaner set about 80 degrees from memory. I also once cleaned used some canned air to blow out the passages in the carbs, these are two stroke ones. There are different size cleaners on tme I paid $270 for a 2 litre size one I think. The couple of bits of parts dirty with oil and grim I cleaned a couple of times changing the water and new detergent. Important I am told not to use a caustic type cleaner.

Sent from my SM-G920I using Tapatalk

[actungbaby]

All the fuel deposits that had stuck to the bowls came off after about an hour in the cleaner . I used simple green in the cleaner set about 80 degrees from memory. I also once cleaned used some canned air to blow out the passages in the carbs, these are two stroke ones. There are different size cleaners on tme I paid $270 for a 2 litre size one I think. The couple of bits of parts dirty with oil and grim I cleaned a couple of times changing the water and new detergent. Important I am told not to use a caustic type cleaner.

Sent from my SM-G920I using Tapatalk

Yes your right the caustic type cleaner with a die cast type alloy carb body u chould pit the surface real bad quickly.yes very cool . what i have read.

There alot of unseen gallerys in the carbs so thats the benifet of that mehod .

thanks for the info 270.00 is affordable and your leaning as you go so win win.

[actungbaby]

This must be 99th sign of madness replying to my own post ;-)

Turns out i had two clutch shudder steel seats in place plus the judder spring opps . system is fine know ;-)

Plus the master clutch cylinder seal replacement fixed the pressure issue.