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WBX man
Samba Member
Joined: September 06, 2006
Posts: 94
Location: Copenhagen, Denmark, Europe
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 Posted: Mon Mar 01, 2010 7:05 am Post subject: |
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| rs4-380 wrote: |
| interesting, although I would go with a larger master cylinder over a larger booster. A larger booster will make it easier to depress the pedal, but not necessarily give you any more braking "power". |
Larger master cylinder diameter will decrease the brake ratio and increase the pedal pressure. (equal to less brake power)
_________________
2,1 DJ WBX Vanagon/ T3 with Megasquirt/ Renault-Lotus UN1 gearbox/ 320 mm AMG front brakes/ 280mm Eurovan rear brakes
My recent projects:
http://www.t3nettet.dk/viewtopic.php?p=6342#6342 |
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WBX man
Samba Member
Joined: September 06, 2006
Posts: 94
Location: Copenhagen, Denmark, Europe
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| Posted: Mon Mar 01, 2010 7:10 am Post subject: |
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...btw has anybody found a booster that doesn't need modifications to fit ?
_________________
2,1 DJ WBX Vanagon/ T3 with Megasquirt/ Renault-Lotus UN1 gearbox/ 320 mm AMG front brakes/ 280mm Eurovan rear brakes
My recent projects:
http://www.t3nettet.dk/viewtopic.php?p=6342#6342 |
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rs4-380
Samba Member
Joined: August 13, 2006
Posts: 449
Location: Maine
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| Posted: Mon Mar 01, 2010 2:43 pm Post subject: |
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| WBX man wrote: |
Larger master cylinder diameter will decrease the brake ratio and increase the pedal pressure. (equal to less brake power) |
a bigger mc will increase pedal effort, but for a given pedal stroke, it will displace more fluid, creating higher pressures at the slave (brake) cylinders.
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Dave
87 EJ25 Syncro GL |
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wbx
Samba Member
Joined: April 11, 2005
Posts: 1254
Location: Monterey, CA
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| Posted: Mon Mar 01, 2010 2:59 pm Post subject: |
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| rs4-380 wrote: |
| a bigger mc will increase pedal effort, but for a given pedal stroke, it will displace more fluid, creating higher pressures at the slave (brake) cylinders. |
Sorry, but you've got that wrong. The reason why the bigger MC will increase pedal effort is because the increased displacement of fluid reduced the pressure at the brake cylinders.
You got 2 out of 3 correct.
With hydraulics, the trade-off with master cylinder piston area is always fluid displacement vs. pressure you can achieve. More fluid being displaced, the lower the pressure and vice-versa - all else being equal.
Just think about the relationships in the equation: Force = Pressure x Area
and how everywhere in a hydraulic line, pressures are equal.
_________________
'84 Westy (first owner).......but my daily driver has pedals
My "perspective" mantra:
A Volkswagen Vanagon is just a material thing,
As such, it is of the earth,
And if i need to, I can let my Van go. |
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rs4-380
Samba Member
Joined: August 13, 2006
Posts: 449
Location: Maine
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| Posted: Mon Mar 01, 2010 3:08 pm Post subject: |
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yep. I'm just wrong on that.
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Dave
87 EJ25 Syncro GL |
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r39o
Samba Polizei
Joined: May 18, 2005
Posts: 9800
Location: San Diego
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| Posted: Sat Mar 06, 2010 11:12 am Post subject: |
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I need a Vanagon Clevis pin! Who can help?
I got the below booster. Do you reuse the rubber boot? What is so wrong with the clevis pin?
_________________
"Use the SEARCH, Luke" But first visit the Vanagon FAQ!
1990 Multivan EJ 22, Rancho trans 0.82 4th, Small Car front AC, CLKs w/ 215/65-16, homemade big brakes 303mm, Konis, Recaros, etc....
Click to see my ads for Cup holders, Subaru clutch fix and CLK wheels (no wheels currently) |
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itzdshtz
Samba Member
Joined: December 24, 2006
Posts: 117
Location: Revelstoke
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r39o
Samba Polizei
Joined: May 18, 2005
Posts: 9800
Location: San Diego
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| Posted: Sat Mar 06, 2010 3:42 pm Post subject: |
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I know to reuse the one installed. But, my circumstances dictate I have the right part before the job is done.
Anybody have an extra Vanagon clevas?
_________________
"Use the SEARCH, Luke" But first visit the Vanagon FAQ!
1990 Multivan EJ 22, Rancho trans 0.82 4th, Small Car front AC, CLKs w/ 215/65-16, homemade big brakes 303mm, Konis, Recaros, etc....
Click to see my ads for Cup holders, Subaru clutch fix and CLK wheels (no wheels currently) |
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r39o
Samba Polizei
Joined: May 18, 2005
Posts: 9800
Location: San Diego
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| Posted: Sat Mar 06, 2010 3:45 pm Post subject: |
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| syncrodoka wrote: |
In the syncro yahoo group this came up a little while ago. Florian got a part from germany that is supposed to work BMW part# 34331157983 http://autos.groups.yahoo.com/group/Syncro/message/44354
I cannot find one on this side of the pond. It is good know that there is a US version that might work. 
Is there a part number on yours? |
I got 34331157984.
What is the difference between the (last digit) 3 (above) and the 4 I got?
_________________
"Use the SEARCH, Luke" But first visit the Vanagon FAQ!
1990 Multivan EJ 22, Rancho trans 0.82 4th, Small Car front AC, CLKs w/ 215/65-16, homemade big brakes 303mm, Konis, Recaros, etc....
Click to see my ads for Cup holders, Subaru clutch fix and CLK wheels (no wheels currently) |
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j_dirge
Samba Member
Joined: August 08, 2007
Posts: 4641
Location: Twain Harte, CA
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| Posted: Wed Mar 24, 2010 9:13 am Post subject: |
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What is the function of the two shear bolts used to hold the stearing column in place?
(These must be removed to remove brackets over the booster.. part of this project)
Can these shear bolts be replaced with ordinary metric hardware to match that used at the upper brackets?
Bentley says drill out and replace with new.. I understand a pair of visegrips works, too.
But whats the point of using shear bolts here?
_________________
-89 GL Westy, SVX.. finally.
-57 pan f/g buggy with a 67 pancake Type 3 "S"
"Jimi Hendrix owned one. Richard Nixon did not"
-Grand Tour, Season 1, episodes 4 and 5
| danfromsyr wrote: |
those are straight line runs with light weight race cars for only 1/4mile at a time..
not pushing a loaded brick up a mountain pass with a family of 4+ inside expecting to have an event free vacation..
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Christopher Schimke
Samba Member
Joined: August 03, 2005
Posts: 5391
Location: PNW
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| Posted: Wed Mar 24, 2010 9:25 am Post subject: |
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| j_dirge wrote: |
But whats the point of using shear bolts here? |
Anti-theft/anti-tampering. Some state that these are shear bolts in the sense that they are supposed to shear off in the event of a collision, but this is not true. You can see the evidence of this in the crash test videos. I also have second hand verification (from my dad, who used to work for VW) that VOA even states that these bolts are not a safety device. They can be replaced with regular old bolts and yes, vise grips work fine to get them out.
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"Sometimes you have to build a box to think outside of." - Bruce (not Springsteen)
*Custom wheel hardware for Audi/VW, Porsche and Mercedes wheels - Urethane Suspension Bushings*
T3Technique.com or contact me at [email protected] |
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r39o
Samba Polizei
Joined: May 18, 2005
Posts: 9800
Location: San Diego
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| Posted: Wed Mar 24, 2010 10:17 am Post subject: |
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| r39o wrote: |
| syncrodoka wrote: |
In the syncro yahoo group this came up a little while ago. Florian got a part from germany that is supposed to work BMW part# 34331157983 http://autos.groups.yahoo.com/group/Syncro/message/44354
I cannot find one on this side of the pond. It is good know that there is a US version that might work.
Is there a part number on yours? |
I got 34331157984.
What is the difference between the (last digit) 3 (above) and the 4 I got? |
Anybody?
_________________
"Use the SEARCH, Luke" But first visit the Vanagon FAQ!
1990 Multivan EJ 22, Rancho trans 0.82 4th, Small Car front AC, CLKs w/ 215/65-16, homemade big brakes 303mm, Konis, Recaros, etc....
Click to see my ads for Cup holders, Subaru clutch fix and CLK wheels (no wheels currently) |
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Wellington
Samba Member
Joined: September 21, 2004
Posts: 1890
Location: Montreal
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| Posted: Wed Mar 24, 2010 10:30 am Post subject: |
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j_dirge
Samba Member
Joined: August 08, 2007
Posts: 4641
Location: Twain Harte, CA
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| Posted: Wed Mar 24, 2010 11:40 am Post subject: |
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| loogy wrote: |
| j_dirge wrote: |
But whats the point of using shear bolts here? |
Anti-theft/anti-tampering. Some state that these are shear bolts in the sense that they are supposed to shear off in the event of a collision, but this is not true. You can see the evidence of this in the crash test videos. I also have second hand verification (from my dad, who used to work for VW) that VOA even states that these bolts are not a safety device. They can be replaced with regular old bolts and yes, vise grips work fine to get them out. |
Good to know..
My immediate thought was safety, too.. when I was reading the manual... Confused the guys at the FLAPs, as well. 
Thanks Chris!
I will just use regular ol bolts.. and chase any thieves down on foot.
_________________
-89 GL Westy, SVX.. finally.
-57 pan f/g buggy with a 67 pancake Type 3 "S"
"Jimi Hendrix owned one. Richard Nixon did not"
-Grand Tour, Season 1, episodes 4 and 5
| danfromsyr wrote: |
those are straight line runs with light weight race cars for only 1/4mile at a time..
not pushing a loaded brick up a mountain pass with a family of 4+ inside expecting to have an event free vacation..
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syncrodoka
Samba Member
Joined: December 27, 2005
Posts: 12008
Location: Santa Cruz, CA
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| Posted: Wed Mar 24, 2010 3:28 pm Post subject: |
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| I have had new shear bolts in my hand. The shear part is when they get to torque the allen head driver part breaks off. It looks like a metric socket head bolt end but it tapers to the shear section so that it can break off. |
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syncromarkus
Samba Member
Joined: February 18, 2010
Posts: 1
Location: Ottawa, Ontario, Canada
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| Posted: Sun Mar 28, 2010 6:45 pm Post subject: |
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| klucz wrote: |
E30s came with two different boosters:
ATE 34331157416
GIRLING 34331157908 |
Can someone confirm if either of these part numbers will work? These are really the only ones that are easily sourced in North America. |
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vwlovr
Samba Member
Joined: May 21, 2006
Posts: 1122
Location: on the road
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| Posted: Sat Jun 05, 2010 6:55 pm Post subject: |
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| ok I went to a pick n pull today and there were a bunch of 3 series but they all had 1154xxx instead of 1157xxx. I did find this ATE #34331157566 in a 5 series anyone know if this is the same part since there are two ATE #s in this thread and I'm not sure if the last three numbers make a difference. anyone know? |
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vwlovr
Samba Member
Joined: May 21, 2006
Posts: 1122
Location: on the road
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| Posted: Sun Jun 06, 2010 11:41 pm Post subject: |
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ok, so i installed that booster ATE/BMW #34331157566 and it works great!
thanks herman! |
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syncrodoka
Samba Member
Joined: December 27, 2005
Posts: 12008
Location: Santa Cruz, CA
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| Posted: Sun Jun 06, 2010 11:54 pm Post subject: |
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I have looked at many power brake boosters in BMWs. The last 3 numbers are never the ones listed on this thread though  |
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vwlovr
Samba Member
Joined: May 21, 2006
Posts: 1122
Location: on the road
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| Posted: Mon Jun 07, 2010 12:07 am Post subject: |
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i know right? i'm starting to think the last three numbers don't matter. aside from my own speculation of this, i did find one post somewhere else on the web where someone referenced the part only by the first 8 numbers "34331157" which i found interesting. so maybe that's really it and the last numbers are production related?
someone should try the ones with 34331154xxx there are like 5 of those at the san jose pick n pull. the one i got was only $23. i did this in combo with a new master so it's hard to really say how much of it is the booster and how much of it is the master, but either way it's working better.
now if i can just figure out how the f*** i shorted out my power windows during this job i'll be happy. |
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