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epowell
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Joined: September 23, 2015
Posts: 4350
Location: Czech (mostly) Vancouver (sometimes)
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 Posted: Thu May 09, 2019 7:41 am Post subject: Re: Clutch master cylinder replacement |
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| dobryan wrote: |
Never done the gravity bleed so no help on this one.  |
How do you do it?
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epowell
Samba Member
Joined: September 23, 2015
Posts: 4350
Location: Czech (mostly) Vancouver (sometimes)
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| Posted: Thu May 09, 2019 7:43 am Post subject: Re: Clutch master cylinder replacement |
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| Igeo wrote: |
| You don't have to gravity bleed at all; I just do it that way to start as it gives me an opportunity to put tools away, have a beer etc. But you can pressure or pedal bleed right away. If you pedal bleed it, it is good to have a helper work the pedal while you open/close the slave bleeder. |
Ah.... good to know. I started with my GF right away with pedal bleeding, but it didn't feel right so I came back to refresh the instructions... I think waiting 30min for fluid back there is the best way.
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Dampcamper
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Joined: October 07, 2013
Posts: 766
Location: Rainy Portland, Oregon
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| Posted: Thu May 09, 2019 8:12 am Post subject: Re: Clutch master cylinder replacement |
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| epowell wrote: |
| dobryan wrote: |
| Never done the gravity bleed so no help on this one. |
How do you do it? |
Sounds like you're past this but it's just a fancy way to call it the lazy man's way. Or the single man's way. Just put that tube over the bleeder nipple at the slave cylinder, open the nipple and keep the reservoir up front topped up. Gravity will slowly pull fluid down through the master cylinder and hydraulic line into the slave cylinder and out the tube (into the jar you had the tube emptying into?) When you see fluid coming out (not just big bubbles) then lightly tighten the nipple, go up and pump the pedal. Then do a traditional bleeding procedure.
Takes awhile but is a good way to get the lines mostly purged while, as noted above, you clean up, put tools away, have a beer, etc.
Just don't let the reservoir get low or air will follow the last of the brake fluid into the system and you have to start over. |
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dobryan
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Joined: March 24, 2006
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Location: Brookeville, MD
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epowell
Samba Member
Joined: September 23, 2015
Posts: 4350
Location: Czech (mostly) Vancouver (sometimes)
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| Posted: Thu May 09, 2019 9:13 am Post subject: Re: Clutch master cylinder replacement |
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Anyhow, thanks ALL for all of this help > I guess I now understand the process and procedure... pretty easy. The most difficult part by far was threading the 12mm fluid line into the master. It was also tough to get that rubber supply line off - I didn't want to damage it... but had to reef on it like crazy and ended up pulling the plastic nipple right out of the old MC. Then put vice grips on the old nipple base and twisted the rubber line off.
Next I connected the new MC to the rubber line, then inserted the plunger and pushed the MC as far up as possible > then gently threaded the 12mm fluid line nut into the MC. This took a long time because I was determined not to force it and risk stripping anything... finally got it on, then put on the 2 13mm bolts...
The slave installation was uneventful because over the last month I have spent countless hours pissing around with this and finally honed my own way of doing it - now it's easy 
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On the test drive I noticed right away when reversing out of my parking pad, the clutch now grabs way earlier or faster.
The very first shift into 2nd was a gentle "plunk" rather than the "THUNK" I've been experiencing... the next shift into 2nd after everything warmed up, was smooth as a baby's ass... subsequent shifts into 2nd were smooth or gentle plunking... nothing really bad, but of course it could be better.
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jstr
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Joined: March 10, 2010
Posts: 13
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| Posted: Mon Jul 08, 2019 11:42 am Post subject: Re: Clutch master cylinder replacement |
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Just replaced mine. I got in the van one day and the pedal mysteriously went to floor.
Ordered one from Bus Depot for 44.95. http://www.busdepot.com/251611021cor
Make sure to "bleed" it ( I installed it, filled the reservoir with fluid, and "cracked open" each line going into the MC while depressing the pedal all the way ( with rags underneath to catch the fluid ). I tried to bleed each wheel first before doing this, and the pedal still went to floor. |
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