Re: Brake Booster & Stumble at Startup

[MikeIIDC@domain.elided]

George-

It is my understanding that the Scouts pre-1974 had drum brakes all around,
and they are not known for being all that good.  Mine (1973) really suck for
power brakes, however, I have never tried to fix them much, so I don't know
if they could be better if I tinkered.  As for the vacuum issue, makes sense
to me, but I am not a very good mechanic.  Someone more knowledgeable will
tell you, I'm sure!

Michael

George Humphrey wrote:

>         I've decided to run this theory by the think tank that is the ihc
> digest, to see if it makes sense. I've had a hard starting problem on the
> Scout for sometime now (pretty much since I bought it). When cold it
> starts, stumbles and maintains a very low idle or dies. If I can keep it
> running for maybe 30 second or so,  it will eventually idle better. After
> that it runs beautifully for the rest of the day.
>          My second problem is what I consider to be very marginal power
> brakes. I've never owned a car with power brakes before and am not sure
> how well they are supposed to work, But, I am guessing better than they
> do on my Scout.
>          Conclusion, I have a tear in the power booster diaphragm. My
> stumble at start up is caused by the vacuum to the power brake canister.
> It has to draw air from the entire canister, not just up to the
> diaphragm. Until the shell  holds the entire vacuum  my stumble persists.
> Eventually I'm left with a smooth idling engine with poor power brakes.
>           Does this make sense? I've tested the check valve and it is
> okay. I pumped and pumped and pumped on the vacuum canister but could not
> get a reading on the vacuum gauge. However, after driving for awhile,
> when I pull off the check valve there is some vacuum. Do Scouts have poor
> power brakes and my stumble is caused by something else? I know I should
> only attack one problem at a time but it is too late to work on my Scout
> tonight and my brain is working overtime. Thanks in advance for any
> responses.
>
> George H
> 72 Scout II
> 345
>
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