Trouble with brakes

[J-Rod67]

thanks for checking my post. I am having a lot of trouble getting my brakes to function properly on my 67. It has been converted to power disc brakes and m
I have tried countless times to bleed the system and get the same results each time. I have replaced all components with new ( lines,calipers,wheel cylinders,mc,booster, prop valve). After bleeding each line until all air is removed I crank the truck and test brakes with no success and then discover air in all lines again. This happens every time. After another attempt today I noticed that the front driver side will not bleed (possibly air entering at the bleeder?). Can this one wheel cause air to get back in to the whole system? Anyone had this much trouble with brakes and have any suggestions? Could the prop valve cause trouble? Any help would be greatly appreciated.

Thanks
Jared

[ol'blu72]

Did you bench bleed the new master cyl? If not you will never get them bled.
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[J-Rod67]

Originally Posted by ol'blu72

Did you bench bleed the new master cyl? If not you will never get them bled.
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[J-Rod67]

Thanks for the reply. Yes I did bench bleed the mc.
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[cdowns]

reading a servie manual is a good start to bleeding the brakes correctly

[snipescastle2]

I'd start at the farthest wheel from the master cylinder first (rear brakes) then the right front and Left front, make sure you have another person pumping the pedal (not challenging your experience here) just making sure you have someone who knows to keep the pedal depressed when you bleed each wheel, until you close the bleeder screw, otherwise, it just sucks air back in... some cases, you might need a pressure bleeder. I've found sometimes, you can just crack the bleeder screws open for a few seconds or minutes, until the fluid gravity flows out, then close the bleeder screws. but, you have to keep a watchful eye on the master cylinder level to avoid running it dry...
HTH,
Ben

[GRX]

You can buy a set of "speed bleeders" to make the process a one person job. They are essentially a one way valve. No need to have someone hold the pedal down etc ...

[treveiger]

When bleeding the old school method make sure you slowly pump the peddle until firm and not push fast and hard because that will move the air around making it next to impossible to get the air out of your lines. Also have you replace all the lines and rubber hoses? If so make sure all the connections are snug. Did you make your own brake lines or buy prebent? If you press on the brakes firmly and no fluid comes out air shouldn't get in.

[Stocker]

You mentioned that the front driver side will not properly bleed. I had a similar battle with my rear brakes, spent hours and recycled quarts of fluid through the system. Turned out the wheel cylinders were bad. There was such a tiny amount of seepage that I failed to notice it, but it was enough to allow air into the system. New wheel cylinders did the trick.