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

[Johnny B]

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
> 
> 
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