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Odd Brake Problem On My 77 B

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kyreb1862

kyreb1862

Jedi Knight
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This one is a bit odd. If I fill the wedge reservoir of my 77 B all the way to the bottom of the filler tube and then use the brakes hard, I get brake fluid squirting out through the cap vent. Any ideas here? Do I just have the reservoir to full? What is the proper fill level for the reservoir?

Regards John
 
OK, I think I may have this figured out. I dug out my owners manual today (yes I actually have the owners manual) and the manual says to add brake fluid to the bottom of the filler tube. Now since the reservoir itself is slanted I'm thinking it means to the front edge of the filler tube. The way I had been filling it I actually had brake fluid up in the filler tube. Doing it the way the manual says leaves a little air pocket above and behind the bottom of the tube which gives the fluid a little room to expand. Since doing it this way I have had no more problems with fluid wanting to come out the cap vents under hard braking. Now I can brake hard and have no fluid problems.

Regards John
 
Gotta love the easy fixes, right? /bcforum/images/%%GRAEMLIN_URL%%/smile.gif

A grumpy old geezer on another forum often used to answer such questions with the acronym, RTFM. Otherwise known as Read The Freakin' Manual! /bcforum/images/%%GRAEMLIN_URL%%/laugh.gif Always cracked me up... And it's usually pretty good advice! (Unless you're using a Chiltons.)
 
If you have fluid flowing back into the reservoir under any braking condition, you have a bad MC. Lowering the level will only mask what could be a fatal issue.
 
And that would be releasing the brakes, his post said when he braked hard (not released hard) enough fluid came bake to force it out of the vent. When you release the brake fluid FLOWS, not pumped, and never more than what you started with, so there should not be enough to cause overflow even if you started to full.
 
Seems a new master cylinder kit at the least is in order.
 
You got that right.For the most part , waiting until right after the brakes fail is pretty poor timing.
 
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