How did brake fluid get inside my brake booster? - Alfa Romeo Bulletin Board & Forums

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Old 04-25-2009, 06:40 PM
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How did brake fluid get inside my brake booster?

And how do I get it out? So, my brake pedal goes all the way to the floor and I get another master cylinder to replace my original. I'm getting ready to put the new master cylinder in and I notice there is brake fluid inside the brake booster, and not just a little bit either. There is a pool of brake fluid up to within a 1/2 inch of the edge of the master cylinder hole. What would cause brake fluid to be inside my booster and how do I fix it?

Almost as important is how do I get the brake fluid out and does it have to be completely dry inside a brake booster or can the walls still be a little oiley?

Thanks for your knowledge as you can see I'm lacking in that department right now,
Jim
2O6 725-CELL

Side note: This '82 Alfa Romeo Spider Veloce with hardtop might be for sale soon if anyone is in the Seattle area and wants to take a look at it.
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Old 04-25-2009, 07:16 PM
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The seal on your master cylinder let go and every time you press the brake, a bit more fluid squirts past and into the booster housing. Replacing the MS will cure that.

To get it out of the booster, a syringe or turkey baster can be used for the majority of it, then a swab in some kind of suitable holder (like mabe a rifle bore patch eye perhaps) to get as much residue as you can access.

The drier you can get it the better as it'll eventually put the rot to the diaphram, which won't cause a brake failure, but will cost you the vacuum assist and make the brake pedal really hard. It'll also create a vacuum/false air leak when it goes.
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Old 04-25-2009, 07:54 PM
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Quote:
Originally Posted by Tifosi View Post
The seal on your master cylinder let go and every time you press the brake, a bit more fluid squirts past and into the booster
Yup. Just to elaborate on Tifosi's answer, keep in mind that the vacuum booster, has well, a vacuum in it. So, it tends to suck the fluid out of the MC if its rear seal is at all weak. This is an absolutely standard failure mode for the MC. A new MC is the simplest solution - you could also try rebuilding your old one, though that doesn't always work.

And, while your booster won't die right away, exposing the diaphram to brake fluid will kill it eventually. So getting as much fluid out as possible is a nice idea - it may delay the inevitable for another few months. After using the baster, stuff some rags or paper toweling in there to sop up the remaining fluid. Why these diaphrams can't be made of brake fluid resistant material is beyond me. If you live in a major metropolitan area, there is probably a shop that can rebuild your booster - it's is pretty standard ATE booster - just don't tell them it's for an Alfa Romeo.
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Last edited by Alfajay; 04-25-2009 at 07:57 PM.
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Old 04-25-2009, 08:22 PM
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Sorry about this post(I messed it up a bit)....but on one of my boosters (albeit not like the later ATEs ) the fluid leaked into the chamber and did some damage....just a little.....sorry about the other non relevant photos.
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Last edited by 1750GT; 04-25-2009 at 08:56 PM.
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Old 04-25-2009, 08:38 PM
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...deleted this as well..sorry
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Last edited by 1750GT; 04-25-2009 at 08:50 PM. Reason: wrong booster
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