[urq] UrQ brake booster/servo

[daniel darlington]

i'm glad that worked out for you, eric.  
we finally got the car inside, and it's starting to
look really depressing as parts have been coming off. 
i have got a few calls as to another car to tinker
with, but that may be a few months away.

i have lost a few of my e-mails, but to whomever
wanted the gas tank, please mail me off list.  i have
it drained and ready to come out.

i don't have a ton of free time lately, but i am still
trying to get all the parts many listers are asking
about.  a few things are out, and if you wanna come by
and pull things yourself, lemme know! (NE ATL).
-dan darlington.
-'83 ur-Q, bent in half.


--- "Renneisen, Eric      475"
<Eric.Renneisen at CIGNA.com> wrote:
> Jim Furdyn wrote:
> > You mentioned that you have a document that you 
> > were working on about the differences between 
> > the two brake boosters. May I have a copy of 
> > that?
> 
> Sure, I'll send you a copy when I get home this
> evening.
> 
> > Also, I'll assume that the later P/N is the 
> > aluminum booster (857 612 107 A) compared to the 
> > earlier one (857 612 107). 
> 
> Careful here.  I don't see 857 612 107 in either the
> US or Euro versions
> of the family album.  The later cars ('88+) have 859
> 612 107, but their
> hydraulic system is completely different (similar to
> the non-turbo 20V
> stuff).
> 
> As far as I can tell, the P/N didn't change when
> they went from Fe to
> Al.  It's probably just a change the supplier (Ate)
> made without
> changing functionality.  I suppose this means that
> you might find an Fe
> booster on an early bimmer 7-series.  The one I got
> was from '84, I
> think, and it's Al.
> 
> > My question is, are these two boosters
> interchangeable? 
> > The reason I ask is I was offered your BMW
> replacement 
> > and want to know what (if any) mods needed to be
> done 
> > in order to make it work. You said that the rod
> that 
> > goes to the brake pedal is shorter, can this be
> removed 
> > and replaced with the correct one from the
> original 
> > booster?
> 
> The Fe and Al boosters on the urq are definitely
> interchangeable.  When
> the rebuild of my original Al went sour, I picked up
> an Fe unit (thanks
> Dan!), rebuilt it, and it's on the car now.  I am
> 99.999% certain that
> you can take the rod (with attached plunger) from
> your Fe booster and
> use it in the E23 bimmer Al booster.  I have the
> Audi and bimmer Al
> units apart on my bench right now, and everything
> but the rod length is
> identical.  I have pictures of the innards of both
> Audi units
> side-by-side, and I'm certain that the rod/plunger
> piece is the same.
> There are other pieces that are slightly different,
> but that one should
> be all you need to make it work.
> 
> Eric Renneisen
> '93 S4
> '86 urq
> '85 urq
> Chattanooga, TN
> 
> 
>
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daniel a. darlington




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