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Help Bleeding Brakes

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Raptor44

07-22-2020 17:33:24




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1941 Chevy Flatbed truck. Freshing this up, Motor rebuild some paint and body work. Installed new brake shoes, wheel cylinders, all lines. Installed a new duel master cylinder with vacuum boost and a proportioning valve. Have bled and bled the system numerous times and can not get a pedal. Tried doing it manually, and with a vacuum pump. No Joy. Anyone know the secret to getting this right. Any help would be appreciated. Thanks

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Raptor44

09-06-2020 17:10:14




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 Re: Help Bleeding Brakes in reply to Raptor44, 07-22-2020 17:33:24  
Well after much fiddling. It would appear that the shaft for the master cylinder has to be perfectly plum for it to work. It can not be off one IOTA.



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Longknife

08-30-2020 10:30:42




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 Re: Help Bleeding Brakes in reply to Raptor44, 07-22-2020 17:33:24  
Quoting Removed, click Modern View to see

Try letting it gravity bleed? Sometimes pumping the pedal makes bubbles that are hard to get out. are you getting anything at the bleeders??



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Raptor44

08-22-2020 13:46:27




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 Re: Help Bleeding Brakes in reply to Raptor44, 07-22-2020 17:33:24  
Well, tried another new and bigger m cylinder. Bled it on the bench installed bled and it still don't work. Thinking of just putting the single pot master back on and run it through the hydravac and see what happens.



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Raptor44

07-23-2020 14:06:25




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 Re: Help Bleeding Brakes in reply to Raptor44, 07-22-2020 17:33:24  
Got both of these from Jegs. Said they would work. Got any vasoline left?



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John Saeli

07-24-2020 05:14:14




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 Re: Help Bleeding Brakes in reply to Raptor44, 07-23-2020 14:06:25  
Are these re-man's? Just recently our son had a new M/C where a valve in there wouldn't let the brakes release. Pumped up fine, but held the brakes on. It is on a 1980 C60.



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Raptor44

07-23-2020 07:03:05




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 Re: Help Bleeding Brakes in reply to Raptor44, 07-22-2020 17:33:24  
Interesting. Could be. Put one of these Master Cylinder on the 47 GMC tow truck. Same problem.



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John Saeli

07-23-2020 06:58:56




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 Re: Help Bleeding Brakes in reply to Raptor44, 07-22-2020 17:33:24  
When we were doing outside shop work, after 3 days of being stumped one time, I discovered all 3 re-man cyl's I got and installed from the auto parts were bad. They didn't even supply the Vaseline.



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Duner Wi

07-22-2020 19:16:09




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 Re: Help Bleeding Brakes in reply to Raptor44, 07-22-2020 17:33:24  
This might help if you did not bench bleed the master cyl. Usually there are instructions with new /rebuilt master cyl. as to bench bleeding.
https://www.youtube.com/watch?v=USdtwqju4GY



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