Bad Brake Booster? 67 Super - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 9 (permalink) Old 06-19-2019, 07:29 AM Thread Starter
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Bad Brake Booster? 67 Super

Hello,

I have a '67 super with standard brake set up. Brakes work well but fluid is getting into the intake causing misfire and a lot of blue smoke through the exhaust. I've changed the one way valve. I'm wondering if there is a valve on the booster that needs to be changed as well or is it just the booster that is bad. Thank you in advance. Given how expensive they are, I'd like to confirm it before ordering a rebuilt one.
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post #2 of 9 (permalink) Old 06-19-2019, 08:25 AM
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Yes, they eventually leak and that's where the fluid goes; it's much like a master cylinder inside. You can buy a rebuild kit from Classic Alfa for $125 I think, they are not hard to do. Assuming the bore is basically OK, they rebuild decently.
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post #3 of 9 (permalink) Old 06-19-2019, 10:33 AM Thread Starter
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Thank you Andrew. Without knowing it, you've been very helpful along the way of my GS restoration. Much appreciated. Once brakes works as they should, I will post some pics as it is now complete.
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post #4 of 9 (permalink) Old 06-19-2019, 10:37 AM
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If you're not handy with hydraulics, I maybe wouldn't try it. But it's a simple cylinder, with an additional little angled valve and "hat" seal, and the air valve, which usually is fine. Take all the parts out carefully, line them up, put it back the same way after cleaning etc and looking at the condition of the bore.

Classic Alfa ships in like two days to the US with DHL, still cheaper than the competition.

You can also find repro Mini boosters through Moss and others for reasonable $$, as long as they have 3/8" 24 threads for the piping. 10mm thread is almost, not quite, identical.

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post #5 of 9 (permalink) Old 06-19-2019, 10:43 AM
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Quote:
Originally Posted by Andrew View Post
If you're not handy with hydraulics, I maybe wouldn't try it.
Karps might be able to rebuild a worn booster. See: http://www.karpspb.com/booster.htm

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You can also find repro Mini boosters through Moss and others for reasonable $$, as long as they have 3/8" 24 threads for the piping.
Hmm, interesting. I always wondered if there was an alternate source for these fluid-to-fluid boosters.

Is this the product you mean? The valve looks different, but it seems like it would bolt in with no alterations to the rigid lines. See: https://mossmotors.com/classic-mini/...arket-5-8-bore Note that Moss sells these in both 11/16th and 7/8th bore variations - which is correct for a 105 Alfa? Moss prices both at $165 (versus $259 for a correct-looking one at Classic Alfa).


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'65 Guilia Sprint GT
'67 Duetto
'91 164L

Last edited by Alfajay; 06-19-2019 at 10:55 AM.
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post #6 of 9 (permalink) Old 06-19-2019, 10:47 AM Thread Starter
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Again, very helpful. Thank you. I'm ok with hydraulics and quite enjoy projects like this.

As you likely know, there are two kits, one for the air valve and one for the servo. If I have to buy both, I'd be better off just purchasing a rebuilt booster. As the booster (brake assist) works fine, I assume the air valve is good. Fair assumption?
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post #7 of 9 (permalink) Old 06-19-2019, 11:03 AM
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That's Lockheed (69s US cars had them). It'll work, but is not the Dunlop/Bendix/Bonaldi booster, which is better.
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post #8 of 9 (permalink) Old 06-19-2019, 11:52 AM
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Quote:
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That's Lockheed (69s US cars had them). It'll work, but is not the Dunlop/Bendix/Bonaldi booster, which is better.
I don't disagree, but the Lockheed-style booster was all I could find on the Moss Motors website. Too bad - I liked the $165 price!

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post #9 of 9 (permalink) Old 06-21-2019, 10:06 PM
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Which is the correct size from Moss, and what's the user experience like?

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