[DeTomaso] Brake booster vacuum

[gow2 at rc-tech.net]

My booster was bad in my car. I sent it off and it had quite a bit of
engine oil and was un-reparable. If it sucks a vacuum then air comes from
a booster but what about shut down when the booster neutralizes. I would
thing a check valve would stop this but even check valves have a bit of
leak down. I just don't think the air is a one way flow unless everything
is perfect; which often is not the case.




> Cool.  Makes me want to pull out the old vacuum booster and check it out.
>
> My booster started leaking years ago.  I noticed a change in the sound
> coming from the engine.  It didn't take me long to realize I was pushing
> the
> pedal down harder to maintain speed.  The brakes were slowly applying
> without my foot on the pedal.  It took quite a while to get home that day.
> I thought about rebuilding the booster, and I guess I still can.  Instead,
> I
> switched to Wilwood pedals/boosters, and I've been very happy with the
> results.  I'm not saying they are better than the original booster.  I'm
> just saying the manual masters work great too.
>
> From:  Jeff Cobb <jeffcobb1 at me.com>
> Date:  Wednesday, October 10, 2012 10:47 PM
> To:  Will Kooiman <will.kooiman at gmail.com>
> Cc:  Jeff Cobb <jeffcobb1 at me.com>, Sean <seanmundy at hotmail.com>,
> "MikeLDrew at aol.com" <MikeLDrew at aol.com>, "guson at home.se" <guson at home.se>,
> "detomaso at realbig.com" <detomaso at realbig.com>
> Subject:  Re: [DeTomaso] Brake booster vacuum
>
> The air in all boosters is filtered at the pedal push rod and that filter
> quiets down the vacuum noise that is going on. One of the test of a bad
> booster is its
> affect on the no load idle which of course indicate a larger than designed
> vac leak.
> Fixed a MGB today that had a loose filter because the customer stated he
> heard a large sucking noise upon brake pedal touching.
>
> Jeff Cobb
> Cell 225-907-4514
>
> On Oct 10, 2012, at 10:40 PM, Will Kooiman wrote:
>
>> And the air actually comes from inside the cabin.
>>
>> When you press the brake pedal, it lets atmospheric pressure into the
>> cabin
>> side of the booster, which provides the assist.
>>
>> I've always wondered if any of this air is filtered.  After all, it
>> eventually goes into the engine.  Fortunately, it doesn't suck a lot of
>> air.
>>
>>
>> From:  Sean <seanmundy at hotmail.com>
>> Date:  Wednesday, October 10, 2012 10:22 PM
>> To:  "MikeLDrew at aol.com" <MikeLDrew at aol.com>
>> Cc:  "guson at home.se" <guson at home.se>, "john at haasline.com"
>> <john at haasline.com>, Will Kooiman <will.kooiman at gmail.com>,
>> "detomaso at realbig.com" <detomaso at realbig.com>
>> Subject:  Re: [DeTomaso] Brake booster vacuum
>>
>> Wow of course. I feel really dumb. Thanks Mike!!
>>
>> Sent from my iPhone
>>
>> On Oct 10, 2012, at 4:14 PM, MikeLDrew at aol.com wrote:
>>
>>>
>>> In a message dated 10/10/12 15 35 51, seanmundy at hotmail.com writes:
>>>
>>>
>>>> If you connect to the intake for vacuum aren't you sucking gas and air
>>>> both
>>>> into the brake vacuum hose?  Is that normal?
>>>
>>>
>>>>>>>> The vacuum hose sucks FROM the brake booster, into the engine....
>>>
>>> Mike
>>
>>
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