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 Post subject: VH44 Booster Problem
PostPosted: Sat Feb 15, 2020 4:59 pm 
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848cc
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Joined: Mon Nov 02, 2015 12:05 pm
Posts: 425
Location: Sunshine Coast, QLD
Well today after replacing a blown Hydro bag we took the Little Fella for a run to see if it was all working good
I havent driven any cars much in the last 2 months after nearly dying from an internal bleed last december
What i noticed was with my foot on the brake the idle became very low to the point of stalling
Take my foot off the brake and it ran well
I also notice the brakes dont seem to have much power to them
My theory is the Booster is leaking
It looks rather new but dont know when it might have been fitted
What are other peoples findings
Thanks
Marc :wink:

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 Post subject: Re: VH44 Booster Problem
PostPosted: Sat Feb 15, 2020 5:35 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39621
Location: near Baulkham Hills, NSW
From your symptoms I'd say the rubber diaphragm has split.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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 Post subject: Re: VH44 Booster Problem
PostPosted: Sat Feb 15, 2020 8:07 pm 
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Joined: Wed Oct 03, 2007 9:04 pm
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Location: Melbourne, VIC
If you enjoy the theory of stuff and like investigating this may help - viewtopic.php?f=25&t=90214

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ex-NSW Police 1970 MK II Cooper S
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 Post subject: Re: VH44 Booster Problem
PostPosted: Sat Feb 15, 2020 8:54 pm 
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Joined: Thu Sep 17, 2015 9:25 pm
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Location: Brisbane
Agree with the Doc, have had this happen a couple of times over the years. A lot easier to fix than a leak.

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Clive G
1969 Mk II Cooper S
1970 MK II Cooper S
1963 Triumph Spitfire
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 Post subject: Re: VH44 Booster Problem
PostPosted: Sun Feb 16, 2020 5:39 am 
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Joined: Mon Oct 10, 2016 7:06 pm
Posts: 112
I had a similar issue but with just noticeable (to real Mini people, not me) symptoms. Grieg at Mini Classic had ordered a new booster but found a leak in the elbow of the vacuum line below the booster.
(a stent sometimes saves the need for major surgery)
Good luck on all counts. Dave D


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