[s-cars] Brake Master Cylinder Replacement Procedure

[Cody Forbes]

Brake fluid is supposed to be replaced every two years anyways, a task which I find is horribly neglected.

-Cody Forbes (mobile)
PS. Shit, that reminds me... 


On Dec 9, 2012, at 11:17 PM, Thomas Rodriguez <trodri69 at gmail.com> wrote:

> 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
>>> _______________________________________________
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>>> 
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