[urq] V8 Brake swap for UrQ - bad info worse than no info.?

Sat Sep 18 07:18:34 PDT 2010

sucks that Ben was put in the predicament but "this" is why this list is so 
great. People stepping up to the plate. Part of the reason my urq is still on 
the road is because of the generosity of other members (Mike Sylvester). Also 
lucky enough to have another local (eurodesign) offering up freebies from yard 
cars, keeping the 90q and Urs4 on the road. If not, I'd probably have to be 
driving the ahem, Buick... 8-)

cheers,

tom.

________________________________
From: Johnny B <pre95 at live.com>
To: urq <urq at audifans.com>
Sent: Sat, September 18, 2010 7:19:47 AM
Subject: Re: [urq] V8 Brake swap for UrQ - bad info worse than no info.?

Hey Ben,

Cant agree more, and have also been bitten in the past not necessarily from this 
list but from bad here-say on forums. 

I dont have an answer for your question below, but do know that a Ur-q recently 
up for sale had the V8 rear brake swap completed. The ad for the car (already 
sold) is at 
http://audifans.com/marketplace/show.php?table=pm_audifans_Cars&id=4313 .. maybe 
the owner can help you out a bit? 

If your in a real bind, my ur-q is going nowhere fast. Your welcome to some bits 
to get yours back on the road if need be, I'm local (ssf). 

Johnny

> From: benswann at verizon.net
> To: urq at audifans.com
> Date: Sat, 18 Sep 2010 00:47:04 -0400
> CC: benswann at verizon.net
> Subject: [urq] V8 Brake swap for UrQ - bad info worse than no info.?
> 
> 
> I have been in process of upgrading rear brakes to V8 calipers, carriers and 
>rotors.
> That part went fairly well and except for having a little mixup with the rotors 
>- that
> looks great!
> 
> There were several "suggestions" from folks I put high credibility in 
>information I get
> on this list -  that in order to utilize the larger diameter rears I needed to 
>also use
> the V8 or 200 master cyl.  Good suggestion I thought - pretty trivial to 
>replace that -
> albiet a bit or a PITA.    One ought to presume that unless additional 
>information is
> given to the contrary that a swap is a simple swap.
> 
> Now this is where someone should have provided a clue that this was not a 
>doable swap
> for mere mortals or at least there was more to just swapping the master 
>cylinder out.
> If there was BTDT on this I should have been advised….
> 
> OK - The line hookup needed to bend the lines  and reconfigure the hookups - 
>old MC had
> lineson bottom and sides - new MC had a V configuration. That is not t a real 
>big deal,
> but should have been mentioned.  Not everyone presumes things need to be bent 
>or ...
> 
> Here is what frosted me..
> 
> The original master cylinder bore is less diameter than the V8/200 MC  that is 
>where the
> disaster started.  There was a plastic sleeve in the hydraulic booster that the 
>master
> is pressed into - or so I thought it was a sleeve.  It  was held by captive 
>bolt at
> bottom - O should have also figured that since it was a sawtooth grip nut - one 
>way only
> - to stop there and re install my otherwise good working "original": MC.
> 
> Yes -   I should have stopped there, but being is no caveats based on BTDT were 
>issued,
> presumed this was not a problem.  So I removed the bolt - with difficulty it 
>came out.
> The 'sleeve' was also captive by friction until I helped it free.  Free it 
did!
> Hydraulic fluid, spring, O-ring seal, carrier/retainer, all let loose.  It was 
>not a
> sleeve but a complex shaped seal holding captive - shim, O-ring, 
>veeerylooongspring,
> shaft, retainer and hydraulic fluid under pressure!
> 
> I collected the parts, cleaned my face and figured that the V8 MC should fit in 
>- It
> did, but there would be no seal.  
> 
> Finding that there was no ready way to use the V8 master in the original 
>booster, I
> reassembled the original components as best as I could. 
> 
> So now I'm left with a mess and a car I can't drive  - the funky sawtooth nut 
>is a
> special seal bolt that is one use only.  I tried to seal with copper washers, 
>o-rings -
> hard to hold captive 3000 PSI!   So what do I need to do now - replace the 
>booster?
> Arghhhhhhh!  Where does one get that special seal bolt?  What a big waste of 
>time - I
> could have just used and aftermarket proportioning valve, instead of replacinG 
>the MC.
> 
> I'm venting now - a little less than I did a few wasted hours past,  since this 
>cost me
> not only money, but  a lot of unessessary time and aggravation.  I look to this 
>list a
> source of reliable information and if there is a potential problem with a 
>safety system,
> I expect a little warning.  Here-say is not a good way to disseminate 
>information -
> either you did the job and know the details(BTDT) and provide them, or please 
>don't lead
> someone to do a job that is fraught with major difficulties, especially when it 
>involves
> critical saftey components.
> 
> If I had known this all before, I would have simply installed two new stock 
>calipers.
> 
> I know - caveats for the info. provided on this list, but then  - why bother?  
>That's
> all for now.
> 
> Ben
> 
> 
> _______________________________________________
> Audifans urq mailing list
> Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
> http://www.audifans.com/kb/List_information
> 
> Pictures/Polls/Database at: http://autos.groups.yahoo.com/group/urquattro/
> 

_______________________________________________
Audifans urq mailing list
Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
http://www.audifans.com/kb/List_information

Pictures/Polls/Database at: http://autos.groups.yahoo.com/group/urquattro/