[s-cars] Brake Master Cylinder Replacement Procedure

[Thomas Rodriguez]

Thanks Chris.  I replaced the brake master cylinder this morning
following your procedure.  It worked great and the brake pedal now
feels like new with absolutely no fade.

Lesson learned: Despite my best effort I spilled a lot of brake fluid
when I separated the reservoir from the MC.  For anyone doing this for
the first time, I recommend emptying the brake fluid reservoir prior
to separating it from the MC. This will make for a much cleaner job.
All the brake lines need to be bled after the new MC is in, so you may
as well just change all the brake fluid, including what's in the
reservoir.  Brake fluid is cheap compared to the frustration of
spillage and cleanup.  Also, while the reservoir is off and empty,
check for dirt and grime inside and clean it out if necessary (and dry
thoroughly) prior to refilling.

Tom Rodriguez
'95 S6

On 12/8/12, chris chambers <fastscirocco_2000 at yahoo.com> wrote:
> Tom,
>
> If my memory serves me correctly:
>
> 1. Remove strut tie bar
> 2. Disconnect hose and remove the resevoir, I plugged the hose port with my
> finger and after popping the resevoir off with a screwdriver I rotated
> the resevoir counter clockwise until it was upside down and didn't lose
> much fluid.
> 3. Disconnect the 2 brake lines
> 4. Remove the 2 bolts and remove the master cylinder
> 5. Install the new master cylinder with the 2 bolts
> 6. Re-attach the brake lines but didn't tighten them
> 7. Re-install the brake fluid resevoir - I picked up the resevoir with my
> finger in the hose port and rotated it clockwise onto the master cylinder
> and pressed it into the seals - didn't lose much fluid.
> 8. Re-fill/top off the brake fluid in the resevoir - I didn't need much
> fluid.
> 9. I pumped the master cylinder and my assistant bled air from the
> system by cracking the brake lines open at the master cylinder, this  seemed
> to minimize how much air got into the rest of the system.
> 10. Blead the brakes at each caliper
> 11. Re-install strut tie bar
>
> If the four flexible brake lines haven't been replaced now would be a good
> time to consider doing so, yo don't want one to fail BTDT!
>
>
> HTH
>
> Chris
>
>
>
>
>>________________________________
>> From: Thomas Rodriguez <trodri69 at gmail.com>
>>To: s-car-list <s-car-list at audifans.com>
>>Sent: Saturday, December 8, 2012 6:45 AM
>>Subject: [s-cars] Brake Master Cylinder Replacement Procedure
>>
>>Can someone point me to a good DIY write-up for replacing the brake
>>master cylinder on my '95 URS6? Looks pretty straightforward but any
>>BTDT tips would be appreciated.  Bently shows how it's assembled but
>>gives no tips for replacement procedure.  I have the new part in hand
>>and plan to do the job this weekend.
>>
>>Tom
>>'95 S6
>>_______________________________________________
>>S-CAR-List mailing list
>>http://audifans.com/mailman/listinfo/s-car-list
>>http://www.audifans.com/kb/List_information
>>
>>
>>