Date: Mon, 3 Sep 2007 20:29:13 -0400
Reply-To: Jonce Fancher <streetbugs@WHISPLLC.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jonce Fancher <streetbugs@WHISPLLC.COM>
Subject: Update Brake Master Booster Q?
In-Reply-To: <109b01c7ed15$4c141870$6401a8c0@TOSHIBALAP>
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Hi all
As for an Update.
Pulled the Master cylinder and found about 1 inch of brake fluid in the booster. Decided to pull the booster. With the idea of " How hard could it Be?"
additude. Well now I know why the bentley only shows a picture of it out. This thing Sucked to pull. Still I did it and installed the new one in about 2.5
Hours. With No instructions or guide, picture or anything else. Just take stuff apart and give it a pull. if it doesnt move unbolt some more.
Not a ton of fun but it is off the list of things to do. just need to install the Master cyl and bleed the system and Im good to go. Then On to the ebrake cables.
C-ya Jonce
>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/
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/