200q20v Digest, Vol 123, Issue 1

[SAJanesick - Bellsouth]

Jay -

I'm moderately competent in turning a wrench, and while I'd consider 
rebuilding a clutch master if there were few other alternatives, I draw the 
line with brakes.  It could be a very painful learning experience for a 
first time BMC rebuilder.

However, I thank you for the insight and additional information - and 
applaud you on diving in where others like myself hesitate.  And you have 
provided me with an alternative approach if all else fails.

            - Steve

----- Original Message ----- 
From: "Jay Kempf" <jkempf at madriver.com>
To: <200q20v at audifans.com>
Sent: Tuesday, March 04, 2014 2:28 PM
Subject: Re: 200q20v Digest, Vol 123, Issue 1


> One thing I have done in the past for things you can't get or things you 
> can't rebuild is to buy the nearest a new or rebuilt alternate and 
> disassemble it to get the internal guts and rebuild the existing with 
> those parts. These master cylinders are supposedly not rebuildable but I 
> was able to get one apart and measure it to try to source new seals. So if 
> your 4 port one has exactly the same guts you could just take the guts out 
> and rebuild the one you have with it. The front snap ring can be cut and 
> removed with a Dremel or die grinder with a thin cut off wheel. A standard 
> snap ring can be put in it's place. I have done that part successfully.
>
> Also, I have been resealing unsleeved aluminum brake and clutch cylinder 
> housings for years, probably decades, on high end euro cars. Inspect the 
> bore when you get it apart. If it is clean as most are, then reuse it with 
> the new seals.
>
> The Porsche 928 has a somewhat notoriously hard to get out clutch master. 
> So many rebuild it from the pedal side with the guts of a new clutch 
> master by just removing the pedal pushrod, boot and snap ring. Then 
> pulling the guts out and putting the new guts in. Just one example 
> (happens to be a cast iron housing) but I have done many other oddballs 
> like that. Many where I have taken the seals to the seal supply place and 
> just gotten the new lip seals (normally 4 for a two chamber master). Some 
> master cylinders have different bore diameters for the two diagonal or 
> front/rear circuits so disassembly to know what you have to go get is key.
>
> Regards,
>
> jfk
>
>
>>>
>>> According to an ATE cross-reference site, the internal specs are the 
>>> same
>>> in terms of bore.  Externally they appear identical save the two
>>> additional ports.
>>>
>>> I have not fitted it yet in case I need to send it back.
>>>
>>> The question is has anyone used the unit for the standard 200 and capped
>>> the two additional brake line feed holes with a threaded plug and then
>>> successfully used that BMC in the TQ20V, or are there internal 
>>> differences
>>> that require the original 2 port version?
>>>
>>> If I can save $230 by altering the 4 port BMC to a 2 port, then I'll be
>>> satisfied to drive around town.  No track time intended.
>>>
>>> Thanks,
>>>
>>>      - Steve Janesick
>>> _______________________________________________
>>>
>>
>
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