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dar130 04-27-2008 06:15 PM

bleeding new brake system
'65 chevy P/U 1/2 ton
I just install a new complete brake system, front and rear tubing, switched from front drums to discs and drums on the rear.
I bench filled the MC as instructed, installed it, installed the new tubing to the the MC and proportioning valve. Now, I can not get the air out.
I was using a vacuum tool I rented to bleed the system.
After pulling a cup of fluid from the front left calliper, it was still full of air bubbles. I removed all of the lines to the other brakes and plugged them, trying to isolate the system to just the front left caliper. Still lots of bubbles..
I double checked all connections that they were tight.
Help, what am I doing wrong ?

68NovaSS 04-28-2008 09:09 AM

First of all, you need to bleed the wheel furthest from the MC first, then work to the closest, the left front. With new lines, disconnect the lines and let them gravity drain until you get flow, with the cover off the MC. You could probably drain all 4 at the same time, reconnecting them as they start flowing fluid. Do that to all 4, then on to the bleeding procedure, always starting with the furthest wheel from the MC, the right rear and work to the nearest, the left front. As always when bleeding, ensure the MC doesn't run dry.

Also, make sure your bleeders on the front calipers are on top. If you have the calipers reversed, good chance they aren't. They'll never bleed if not at the top.

47 Coupe 04-28-2008 11:58 AM

Some of the bubbles that you are seeing may be coming from the bleeder screw threads. I've run into that more than once

dar130 04-28-2008 02:56 PM

thank YOU so much for the advice !
I'll start over using the old method of pushing the brake pedal, I'll post back with how it goes..

dar130 04-28-2008 09:21 PM

WoW... thank You so very much... Gravity is a great thing...
Bleed 3 cylinders in sort order.. then I ran out of time for the last one...
Really, gravity worked great...

68NovaSS 04-28-2008 10:48 PM

Great! Let me know when you have pedal, he he. Good luck!

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