[s-cars] Front Brake calipers not releasing.....Master Cylinder?

[Ian Duff]

<conjecture>
Plenty of pedal pressure could still exist with some air trapped in  
the lines, you'd just have to push the pedal a bit further to compress  
the air. If this is the case, you'd have a built-in spring keeping the  
pads against the rotors, as you describe.
</conjecture>

A better read would be the fluid coming out of the bleeder screws  
during bleeding. Was it COMPLETELY free of bubbles before you  
tightened down the bleeder screw?

-Ian Duff.

On 22 Apr, 2009, at 12:41, Jim Fleischer wrote:

> Question.....if I've got plenty of pedal pressure from the bleeding  
> methods tried thus far, is the Motive pressure bleeder really  
> necessary?  Once again, the pistons are pressing well, just not  
> retracting, seems to be on all four corners.....
>
> Just curious before I spend another $54.95.....and wait for another  
> few days for delivery....
>
> Jim
>
>
> ----- Original Message ----- From: "Ian Duff" <iduff at comcast.net>
> To: "Jim Fleischer" <jim at almgt.com>
> Cc: "Scarlist" <s-car-list at audifans.com>
> Sent: Wednesday, April 22, 2009 10:30 AM
> Subject: Re: [s-cars] Front Brake calipers not releasing.....Master  
> Cylinder?
>
>
>> Don't pass go, don't collect $200, do't try to bleed VAG brakes   
>> without a Motive bleeder http://www.motiveproducts.com/. The tried- 
>> but- true pump-hold-bleed doesn't work so well on these cars.
>> -Ian Duff.
>>
>> On 22 Apr, 2009, at 12:25, Jim Fleischer wrote:
>>
>>> Hi Tom,
>>>
>>> I've got a buddy who concocted a pressure bleeder for his  
>>> Volvos......used
>>> it the first time I bled them, and seemed to work okay.  It was a   
>>> little
>>> frustrating to mess with, so I flushed the system the old- 
>>> fashioned  way the
>>> second and third times and seemed to get a stronger bleed.  Pedal   
>>> feel is
>>> like it was before the ruptured rear line put this ball into motion.
>>>
>>> This is my first brake job on the "S" without adult supervision,  
>>> but  I have
>>> done them in the past on some Fords of years past......I've   
>>> spectated on a
>>> couple of Audi brake jobs before.  I'm running VW/Audi DOT 4 fluid  
>>> through
>>> the system, as that is what was in there before.  I've gone with  
>>> all  oem
>>> lines, rotors and pads for the reason that if I screwed something   
>>> up, it
>>> would be pretty obvious to me, or so I thought.
>>>
>>> When looking at the old pads, it looks like this may have been a   
>>> problem for
>>> some time, as there is some uneven wear in the pads on the right   
>>> rear, and
>>> front left.  There also had been some "hot spots" on the rotors   
>>> (that's what
>>> the machinist said.)  Maybe the MC had been acting up for awhile,   
>>> and until
>>> I replaced everything, it was somewhat unnoticeable.
>>>
>>> Brake light does come on for between 20-30 seconds before it  
>>> shuts  off, and
>>> has done that for about a year.  That has not changed throughout  
>>> this
>>> process.
>>>
>>> Thanks for the help everyone!
>>>
>>> Best regards,
>>>
>>> Jim Fleischer
>>>
>>>
>>> ----- Original Message -----
>>> From: "Tom Green" <trgreen at comcast.net>
>>> To: "Scarlist" <s-car-list at audifans.com>; "Jim Fleischer" <jim at almgt.com
>>> >
>>> Sent: Wednesday, April 22, 2009 6:15 AM
>>> Subject: Re: [s-cars] Front Brake calipers not releasing.....Master
>>> Cylinder?
>>>
>>>
>>>>>
>>>> All symptoms point to the master cylinder, Jim.
>>>>
>>>> You did not mention how you were bleeding the brakes.  Do you  
>>>> have a
>>>> power bleeder now?  If so, what kind?
>>>>
>>>> I believe you are experienced at brake work, and fully  
>>>> understand  this
>>>> question,but have you verified that the correct fluid is in each  
>>>> system?
>>>>
>>>> Tom
>>>>
>>>>> -----Original Message-----
>>>>> Date: Tue, 21 Apr 2009 19:45:27 -0600
>>>>> From: "Jim Fleischer" <jim at almgt.com>
>>>>> Subject: Re: [s-cars] Front Brake calipers not  
>>>>> releasing.....Master
>>>>> Cylinder?
>>>>> To: "Lee Levitt" <lee at wheelman.com>
>>>>> Cc: s-car-list at audifans.com
>>>>> Message-ID: <DFA9E02A978D4817AE02080AE70742A0 at 421Capitol>
>>>>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>>>>> reply-type=response
>>>>>
>>>>> The part #'s matched up front and rear, and the shape of the  
>>>>> pads  were
>>>>> identical to what I took off.......they fit fine until the first  
>>>>> brake
>>>>> pedal
>>>>> test.....then they just stay there.  I took the car out again  
>>>>> after
>>>>> bleeding
>>>>> the whole system, twice......after a very short drive, I  
>>>>> checked  all the
>>>>> corners and it looks like I've got issues at all four calipers,   
>>>>> as all
>>>>> the
>>>>> rotors were hot......the fronts are just making more noise than  
>>>>> the
>>>>> rears.....hopefully the master cylinder will do the trick.
>>>>>
>>>>> thanks for the tip, though....
>>>>>
>>>>> Jim
>>>>
>>>>
>>>>
>>>
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>>
>>
>