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ThatDippyTwat |
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ThatDippyTwat World Chat Champion
Joined: 07 Aug 2016 Karma :
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Posted: 16:21 - 16 Feb 2019 Post subject: Bleeding hydraulics or "I fucking hate this clutch" |
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This VFR750 has me at the end of my tether. I cannot get pressure to build on the hydraulic side.
Rebuilt master cylinder, (cleaned & new seals), Nothing.
Rebuild slave cylinder, (cleaned & new seals), Nothing.
New HEL line and Banjo's? Nothing.
New Lever/Master? Nothing.
New copper washers all round, multiple times? Nothing.
Now, I've bled many clutches and brakes, without issue, before. I've just done the rear brake after replacing the fucked OEM line with zero issues, while having a break from trying to bleed the godamn clutch. I have a reverse/suction bleeder, I've tried pushing it up with a syringe. I've tried cracking the Banjo at the Master, and still nothing. This bitch will just not bleed.
Any ideas? Tips? I've gone through 500ml of DOT4 trying to get this bastard thing sorted. ____________________ '98 VFR800 (touring) - '12 VFR800 Crosrunner (Commuting) - '01 KDX220 (Big Green Antisocial Machine)
Last edited by ThatDippyTwat on 19:51 - 22 Feb 2019; edited 1 time in total |
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Sister Sledge |
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Sister Sledge World Chat Champion
Joined: 17 Aug 2018 Karma :
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ThatDippyTwat |
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ThatDippyTwat World Chat Champion
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Meatybeaty |
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Meatybeaty World Chat Champion
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Grubscrew |
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Grubscrew Scooby Slapper
Joined: 23 Dec 2018 Karma :
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ThatDippyTwat |
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ThatDippyTwat World Chat Champion
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Meatybeaty |
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Meatybeaty World Chat Champion
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ThatDippyTwat |
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ThatDippyTwat World Chat Champion
Joined: 07 Aug 2016 Karma :
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Posted: 19:02 - 16 Feb 2019 Post subject: |
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Meatybeaty wrote: | Got a 93 vfr750 myself , but never had this trouble, just wondered did you buy a new set of levers (brake and clutch) and were they Chinese , only the shape of the pivot sometimes varies, just a thought |
Entire lever/master assembly. Yes, Chinese, but more to double check I'm not going mad so I didn't want to spend a fortune. I have the lever, but I'd rather figure out what the issue is and refit the OEM ones.
This was bought after I rebuilt the OEM master and got fuck all. I didn't touch the front brake, it's working fine, I ran some fresh fluid into it a few months back. It works no better or worse than the rebuilt OEM. Rear brake was only rebuilt as I discovered a previous owner has let the OEM rubber hose rub the back wheel at some point, and I'm amazed it didn't puke everywhere, let alone actually work.
Master and Slave were rebuilt with Tourmax kits, and I had another slave off another bike. No difference. I also tried another OEM master off another bike, but that was obviously bad. ____________________ '98 VFR800 (touring) - '12 VFR800 Crosrunner (Commuting) - '01 KDX220 (Big Green Antisocial Machine) |
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Meatybeaty |
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Meatybeaty World Chat Champion
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kgm |
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kgm World Chat Champion
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ThatDippyTwat |
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ThatDippyTwat World Chat Champion
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Tankie |
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Tankie Crazy Courier
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Grubscrew |
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Grubscrew Scooby Slapper
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Sister Sledge |
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Sister Sledge World Chat Champion
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steve the grease |
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steve the grease Crazy Courier
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temeluchus |
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temeluchus World Chat Champion
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ThatDippyTwat |
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ThatDippyTwat World Chat Champion
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Teflon-Mike |
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Teflon-Mike tl;dr
Joined: 01 Jun 2010 Karma :
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Posted: 10:49 - 17 Feb 2019 Post subject: |
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Have you tried strapping the clutch-lever back to the bar to hold the hydraulic pressure on the line; leave it over-night, then 'gently' bleed that bit of pressure off without any pumping?
Idea is that any trapped air in the line isn't allowed to 'dissolve' into the fluid, in ever smaller bubbles. The prolonged pressure gets the bubbles to migrate and join up, and float to the top. gentle relief of pressure then lets bubbles out, and not pumping stops putting any more in. If you get the sort of idea.
Found it works on a variety of hydraulics, usually brakes that don't seem to want to bleed. ____________________ My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?' |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 15:53 - 17 Feb 2019 Post subject: |
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Try bleeding it at the top banjo. An air bubble can sit there and you'll get absolutely nowhere with it. Stick a rag under it and "slightly" crack it in the same way you would the bleed nipple as you pull the lever. If you get farty diarrhoea noises, you're bleeding air out. Continue until they go away and try again at the bottom. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Fisty |
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Fisty Super Spammer
Joined: 11 Apr 2007 Karma :
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ThatDippyTwat |
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ThatDippyTwat World Chat Champion
Joined: 07 Aug 2016 Karma :
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Posted: 18:37 - 17 Feb 2019 Post subject: |
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I have tried bleeding from the top banjo, before I started fucking aruond with reverse bleeding and syringes etc. I'll try it again.
Ripped it all down again today, rebuilt the master, slave and cleaned all the lines and banjos. Everything meticulously cleaned.
Pulled clutch, and rebuilt it again, according to the Haynes manual. I'm not missing anything, assuming item 6 on the diagram is the springclip that goes in a groove around the pushy bit that goes in the bearing that goes in the pressure plate. Pretty sure it is.
I now get some disengagement, and if I put pressure on the rear wheel, I get some movement. Vids follow. Rear caliper is not binding, wheel spins freely in neutral - It's just been rebuilt.
Wheel movement.
https://i.imgur.com/SLt7Wct.mp4
https://i.imgur.com/r1pcLTp.mp4
It's better than it was. There is some pressure at the lever now. It's nowhere near what it was, but it's a light at the end of the tunnel, rather than the scrapper. ____________________ '98 VFR800 (touring) - '12 VFR800 Crosrunner (Commuting) - '01 KDX220 (Big Green Antisocial Machine) |
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Fisty |
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Fisty Super Spammer
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ThatDippyTwat |
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ThatDippyTwat World Chat Champion
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Meatybeaty |
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Meatybeaty World Chat Champion
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redeem ouzzer |
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redeem ouzzer World Chat Champion
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Old Thread Alert!
The last post was made 5 years, 70 days ago. Instead of replying here, would creating a new thread be more useful? |
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