[Vwdiesel] Vwdiesel Digest, Vol 43, Issue 27
biovolks at yahoo.com
Fri May 18 15:38:11 EDT 2007
I had the same problem, the master cylinder is the problem. Be careful though with used parts, I was pulling my hair out when I had that problem. I replaced the vacume booster with the master cylinder attached, and completely replaced the fluid, it lasted a week and came back. It was a equally bad master cylinder. There were no leaks any where in the system, I pretty much rebuilt the entire brake system before I foud that out .
Also, when bleeding the back brakes, make sure the back axle isn't hanging, there's a special hinged valve used to change the braking when the rear raises up,I think it's called a proportioning valve, that will mess up you bleeding.
And make sure the bolts that attach the front calipers are cleaned and lubed so the calipers can move freely, otherwise one brake pad can stay rubbing on the disc.
With the vacume pump, if it's not working, it will make the pedal stiff.
If your oil is too low, or if the oil pump isn't working to get oil to it, it won't be lubricated and cause the pedal to be stiff.
Date: Fri, 18 May 2007 03:19:53 +0000
From: raymond greeley
Subject: Re: [Vwdiesel] a need for vacumn update, which bleeder to use
To: Sandy Cameron , "Vwdiesel at vwfans.com"
Content-Type: text/plain; charset="Windows-1252"
Vac pump update,, I examined again and then changed a section of
of vac house which went into the dash (heater control maybe) and Lo, i had vacuum. the stiff brake pedal went back to normal for
one trip around the block and then went to the floor, make up your
mind!. I had changed both rear brake cyl's last summer and never quite bleed them well enough. Not knowing the history it would seem that it is time to change the brake fluid. Working alone as i do has
anyone used a pressurized brake fluid changer they would recommend. The list of repair/maintenance is getting shorter.> Date: Wed, 16 May 2007 12:35:32 -0400> To: rgreeley2 at hotmail.com; vwdiesel at audifans.com> From: scameron at storm.ca> Subject: Re: [Vwdiesel] Starter issues comments and a need for vacumn.> > At 03:53 PM 16/05/2007 +0000, you wrote:> > >Vacumn, I have a 91 jetta Gl that sat for several months> >in the winter as i waited for warmer climes to change a> >water pump, new timing belt also, Now i don't seem to> >have any vacumn. Bentley seems to be hiding the info> >on it though the archives suggest a simle rebuild> >This is all good though in the back of my mind i am wondering if the "key"> securing the intermediate pulley> >could have not locked in and therefore the sproket spins on the shaft with> the vacumn issue begining there.> > > Caution, do not run the engine until this is investigated!> > The oil pump is driven off the bottom end of the vacuum pump, and if
he> vacuum pump is stuck, there will be no oil pressure..> > It may be "frozzen" from being idle for a while. It's easy 1 bolt removal to> see if it turns freely.> Vanes may be sticking. Rock its shaft back and forth gently and it will come> free.> Make sure its tab is properly aligned with the slot in the oil pump shaft on> re-assembly.> > Since the iintermediate shaft is only run by friction on the bacck of the> timing belt, it may bee slipping on the pulley. Can you turn the shaft by hand?> > Have you properly tensioned the timing belt since changing it?> If its loose, it wont drive the oil pump and vacuum pump.> > Sandy>
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