Any BTDTs ? - How hard is it to manually activate the master brake cylinder

[Kneale Brownson]

I didn't think these alloy mastercylinders could be rebuilt 
successfully.  If pouring water on the MC releases the seized brakes, you 
need a new MC.  Don't know about the hydraulic brake booster holding 
pressure after the pedal's released.  Is that what you think was happening?


At 05:30 PM 07/13/2001 +0200, Kenn Thyrsted wrote:

>Well.. I had a problem with sticking brakes when hot, and as i've had the MC
>rebuilt 2 years ago, -and- as the problem dissapears when i cool down the
>hydraulic brake-servo, i told him to swap the old hydraulic brake-servo with a
>new one.
>Maybe i didn't have to do that, - seemes as i'm in for a new MC. (too) :-/
>
>/Kenn
>----- Original Message -----
>From: "Kneale Brownson" <knotnook at traverse.com>
>To: "Kenn Thyrsted" <thyrsted at e-box.dk>; "Quattropedia" <quattro at audifans.com>
>Sent: Friday, July 13, 2001 5:23 PM
>Subject: Re: Any BTDTs ? - How hard is it to manually activate the master 
>brake
>cylinder
>
>
> > I've never "pumped" a new one by hand prior to installation, but old MC's
> > I've replaced will squirt residual brake fluid just like a squirt gun with
> > just a little pressure on the rod.  Why did he remove the MC if your brakes
> > were working fine on the drive to the garage?
> >
> >
> > At 04:49 PM 07/13/2001 +0200, Kenn Thyrsted wrote:
> >
> > >Hi all
> > >
> > >I'm having my '87 200 TQW in for a clutch job, and for some brake - 
> fixing.
> > >Now i have a question:
> > >How hard is it to manually push the piston in on the master brake cylinder
> > >when
> > >it is off the car ?
> > >My mechanic says that mine is stuck, - he can't move the rod at all.
> > >He states that you usually can do that, on normal brake cylinders. And 
> that
>he
> > >can not imagine that the hydraulic servo is using more power than he is
> > >applying..
> > >
> > >However, - I drove the car to the repair shop 14 days ago, - brakes worked
>as
> > >usual.
> > >The mechanic is baffled too.
> > >
> > >Could it really be stuck ?
> > >Any hints would be appreciated !
> > >
> > >Kenn Thyrsted
> > >'87 200 TQW
> >
> >