sled
Samba Member
Joined: February 16, 2005
Posts: 6259
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 Posted: Wed Aug 27, 2025 9:29 am Post subject: Re: Dual Circuit Master Cylinder conversion |
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| scottydub wrote: |
No pressure is building. I bench bleed the MC and ran about 2-1/2 large bottles of brake fluid through the system with a pneumatic bleeder. I’m getting nothing. I finally disconcerted one of the front brake lines from the MC and pushed the peddle, some fluid was spurting out. I checked all the wheel cylinders for leaks and they are all dry. Any ideas? |
I know its annoying, but nothing beats the ole tried and true method of bleeding...pumping the pedal and cracking the bleeder on the caliper/cylinder while the pedal is under pressure, then close it back up and pump again.
its time consuming, but it works better than any other method.
for the initial bleed what I do, is have a clear bottle (Corona in my case) that is maybe 1/3 full of old brake fluid, with a clear hose submerged in the fluid and the other end stuck on the bleeder nipple. Crack the bleeder and go up front and pump the pedal by hand from underneath (this is specific to split buses). You will see the fluid and air being pumped through the clear tube into the glass bottle. having the tube submerged on one end will not allow any air to back-feed into the system.
I do all four wheels like this from under the bus (I have a lift, but it can be done on jackstands as well). Once nearly all the air has been removed, I finish it off by pumping and cracking as described initially.
Ive installed the Type E disc kit onto MANY buses, both with rear discs as well as rear drums, and I can always get a very firm pedal.
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drive your split. |
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