Date: Sat, 1 Sep 2007 20:56:49 -0700
Reply-To: Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Subject: Re: Brake Master Booster Q?
In-Reply-To: <20070902031015.AA66F5A7F34@mail.davidellis.biz>
Content-Type: text/plain; charset="us-ascii"
In any case you have a shot brake master cylinder evidently.
There's a o-ring where the mc bolts to the booster, make sure you get that
in place on the new one.
R & Ring the booster after the MC is off of it ......another hour perhaps.
You unbold and lift up the pedal assembly with booster attached to it, then
unbolt the booster from the pedal assembly if I recall correctly.
Re wondering about the faster idle - it could be this master cylinder issue
...the rule I apply here is 'fix what you know is broken' ....the MC
obviously.
You could also disconnect and cap off the vacuum hose at the engine
.....then there's no vacuum booster or anything affecting the engine .....if
that goes away then.....you could conclude something about the vac
line/MC/booster is causing the problem. - this falls under 'substitute and
bypass' as a diagnostic strategy, btw.
Just do the MC and see what you get. After it's bled, you don't even need
the instrument cluster in to try out the brakes.
Scott
www.turbovans.com
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Jonce Fancher
Sent: Saturday, September 01, 2007 8:10 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Brake Master Booster Q?
Hi all
Decided to pull the 85 vanagon westi into the shed to take a look at the
Hissing when pressing very hard on the brakes. Here is what I found and not
sure if
it is one thing or 2, So here is the issues
- Vacuum is Sustained in the system during and after motor is shut off. No
Loss of Vacuum untill Brake pedal is Depressed.
- When Depressing Brake Pedal lighly there is Nothing and it is quite. Press
hard and It will hiss. The harder you press the louder it hisses.
- Pulled the dash pod to get a better look at the issue. seem there is some
wettness under the surface to where the Master cyl and the booster are
connected
- Wiped wettness from area depressed Brakes and saw a small stream of fluid
Escaping the system. Fluid is still at max level in Resvoir. ( Bad Master
Cyl. )
- Put vacuum on the system to locate hiss but still could not nail down.
Could it be with the Bad Master it is hissing at the Base seal?
- Bus still stops fine but with a leak it needs to be replaced.
- Ive got 2 spare Boosters but dont know time it takes to R/R. Anyone done a
Booster swap and kept track of time?
- Also on a side note recently when you press the brake down coming to a
stop the motor will rev to 1100 rpm. Is this the Leaking booster letting air
to the
motor? to allow it to reb a bit? I will usually drop back down to std idle
once to a complete stop and only Lightly holding the brake.
Any thoughts and suggestions would be great. Ive got to fix this and the
Ebrake cables so we can go to the Bus Boo in a few weeks.
Thanks Jonce
Jonce Fancher
56 Single Cab
66 Sunroof Bug
66 Variant Squareback
66 Porsche 912
71 Sunroof Bus
84 Vanagon "Gottfried"
85 Vanagon Westi
2003 10 Passenger Sprinter
Fancher's Upholstery Inc. - www.fanchers.com
Not-A-VW Club- http://mywebpages.comcast.net/jaransont3/notavwclub/
