Author Topic: Vacum booster  (Read 368 times)

emptyhead

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Vacum booster
« on: April 15, 2022, 07:05:10 AM »
Posting here and on the 503. Before I run my 3rd vacum booster in 18 months out to a different company I’ll ask I one more time and maybe someone has some answers. I’m running the 51-8030 cardone vac booster, had diaphragm and seals let go on the first two and got 5 miles on #3 and brake are sticking with a really stiff pedal. Am I missing something else somewhere in the system. Installed all new wheel cylinders a couple of years ago. Master cylinder was rebuild again, loosen the line after sitting two days from the out side of the booster and still was under pressure. Will run it in the neighborhood with just the master cylinder to see if the brake are sticking. Any advice is welcome. Thanks

8683jb

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Re: Vacum booster
« Reply #1 on: April 15, 2022, 08:50:25 AM »
Mine were dragging with a hard pedal and I immediately blamed the hydro-vac because of its track record. It turned out to be the master cylinder (rebuilt). I replaced it with new master cylinder and it's been fine ever since. You might confirm your rebuilt one isn't the culprit before you pull the hydro-vac again. Good luck.
Jon
'42 Autocar M2A1

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emptyhead

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Re: Vacum booster
« Reply #2 on: April 15, 2022, 12:01:29 PM »
Just ran it for about 20 minutes with just the master cylinder and no dragging the drums where pretty cool to the touch. In the past the drums would have been to hot to touch.

Jesse

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Re: Vacum booster
« Reply #3 on: April 17, 2022, 05:07:13 PM »
Usually when the brakes are sticking on because of the hydravac its because the push rod is adjusted too far forward.

emptyhead

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Re: Vacum booster
« Reply #4 on: April 24, 2022, 04:58:04 AM »
I backed off on the adjuster and that has seemed to clear up the problem thank you.