[Jimbro727]

Thank you so much for the replies.

Originally Posted by chipster

"What would cause us to get a constant stream of bubbles when depressing the pedal, but no bubbles when using the pressure bleeder?"

There should be a residual pressure valve in the combination valve, in the fitting that the line to the rear brakes fits into. If this valve is missing or not working properly, It would allow the seals in the rear wheel cylinders to act as check valves, letting air into the system as the pedal is being released, but sealing up tight under any pressure so that no fluid could leak out. That is why you are getting bubbles with the 2-man method, and not with the pressure bleeder.

A drum/drum system has a residual pressure valve in each outlet port on the master
cylinder.

A disc/drum system has a residual pressure valve in the combination valve assembly, in the outlet to the rear only.

A disc/disc system has no residual pressure valve. Make sure that you are using the right combination valve and that it is connected properly.

I suppose, that depending what master cylinder and kit you are using, it might be possible that the residual pressure valve is in one of the outlet ports on the master cylinder. If that were the case, it would be critical to have the correct line going to the rear on the master cylinder.

The residual pressure valve makes a lot of sense, but if I'm understanding you correctly, wouldn't the symptoms occur on both sides of the rear brakes? I get solid fluid out of the passenger side, this is only occurring on the driver's side. Could it still be the residual pressure valve? It is a disc/drum setup by the way.

Originally Posted by HWYSTR455

If you keep getting air, then it's a leak, or a bad master. You bench-bled the master, right? Maybe the bleed screws aren't seated all the way, maybe take a look at that. As for a residual valve, regardless, you shouldn't get air. When you are bleeding the rears, (fronts too for that matter) you need to go back and forth between the sides. If your bleed tank holds enough fluid, open both backs at the same time.


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I did bench bleed the master, several times. We were wondering if that could be the issue, if somehow I didn't bleed it correctly, or we let more air in accidentally (we don't think we did). We were dreading taking it off again, but it's worth a shot. Would air in the master cause so many bubbles? The fluid looks like soda using the two man method. Opening both sides is interesting, we can give that a shot.



I'd also like to mention that the bubbles happen instantly after switching from the pressure bleeder to the two man method. If there was air somewhere being forced into the system due to the two man system (combination valve, leak, M/C), wouldn't we get solid fluid for at least a few pumps, and then some bubbles? The bubbles happen instantly, which makes no sense. Taking this into account, the only possibility would be that the bleeder is letting air in, but only under the amount of pressure created by the 2-man method, and not by the 10psi or so created by the pressure bleeder. Does that logic make sense?