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A2 Brake system flush, how to?
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CarGuru > Volkswagen > A2 Brake system flush, how to? 17 March 2005 03:19:38

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A2 Brake system flush, how to?

Rob Guenther 15 March 2005 05:34:45
 Hi... Posting for a friend with a 1991 Jetta TD 310K Kms on it... and what
he thinks may be the original brake fluid after doing his rear drums on the
weekend. (it's black... and his car doesn't stop all that well - He did the
GLI vented disk conversion up front, and with these new rear shoes he can
lock the rear up... but he says his old Jetta, a 1990 TD could stop better -
and my old 1991 Golf seemed like it could stop on a dime... until brake fade
set in at least)

He's done tons of work on various cars (worked in a garage for a while) but
he said he never did a full system flush, and doesn't know the procedure...
How is this done - vacuum pump? Let the lines drain out?... How do you
tackle the fluid in the master cylinder?

We went on to assume that once as fluid is drained you open the bleeder
screws and bleed normally... just adding a LOT more fluid then for a normal
brake job...


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Matt B. 15 March 2005 09:15:11 permanent link ]
 "Rob Guenther" <robertguenther@nos­pamsympatico.ca> wrote in message
news:MYqZd.22280$Jd­2.413336@news20.bell­global.com...> Hi... Posting for a friend with a 1991 Jetta TD 310K Kms on it... and what > he thinks may be the original brake fluid after doing his rear drums on > the weekend. (it's black... and his car doesn't stop all that well - He > did the GLI vented disk conversion up front, and with these new rear shoes > he can lock the rear up... but he says his old Jetta, a 1990 TD could stop > better - and my old 1991 Golf seemed like it could stop on a dime... until > brake fade set in at least)>
He's done tons of work on various cars (worked in a garage for a while) > but he said he never did a full system flush, and doesn't know the > procedure... How is this done - vacuum pump? Let the lines drain out?... > How do you tackle the fluid in the master cylinder?>
We went on to assume that once as fluid is drained you open the bleeder > screws and bleed normally... just adding a LOT more fluid then for a > normal brake job...

I think what you do is open the bleeder screws one at a time starting with
the one farthest away (right rear), have a helper pump the pedal (it'll want
to go to the floor but use short pumps like as in normal braking...don't
push the pedal farther than you normally would in normal braking/driving),
let the reservoir drain a little bit (but don't let air get in
either...don't let the reservoir totally dry out) this first time so you
have room to add clean fluid, add more fluid, pump some more, until the
fluid coming out is clean. Tighten bleeder screw, repeat for left rear,
right front, left front.

Someone jump in if I misstated anything...thanks.

I think the only other word of caution is that the bleeder screws can be
frozen on older cars so don't force it. If if feels like you might snap it
off you probably will. Get professional help if you feel you might do
damage.


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Rob Guenther 17 March 2005 03:19:38 permanent link ]
 Thanks to all that responded, the info has been passed on.

Yah those rear brakes locking up... I spun my 91' Golf around in the rain
the first time I drove it in the wet... Then I learned brake modulation...
Had to with that car.
<jimbehning@doesthi­sblockporkmindspring­.com> wrote in message
news:5ndf3117fcpfn9­t7f9fqkihlgdb954604r­@4ax.com...>I can show you pictures of my Rabbit after the rear brakes locked up.> I rolled into a telephone pole. That hurt me and the car.>
I just do as Bernard says. Empty the old fluid out and start pumping> the pedal until the fresh comes out. Keep the resevoir topped up. If> the pistons are binding anywhere you are going to get poor braking.> You may also get leaks if the fluid is that bad. Internal leaks in the> master cylinder, leaks from the wheel cylinders, or seized front> pistons. He should have installed new rear cylinders or rebuilt the> old. Leaky brake fluid on brake shoes causes grabbing brakes which> causes exciting fishtails which causes physics lessons when relatively> immobile objects connect with your car in places other than tires.>
"Rob Guenther" <robertguenther@nos­pamsympatico.ca> wrote:>
Hi... Posting for a friend with a 1991 Jetta TD 310K Kms on it... and what>>he thinks may be the original brake fluid after doing his rear drums on >>the>>weekend. (it's black... and his car doesn't stop all that well - He did >>the>>GLI vented disk conversion up front, and with these new rear shoes he can>>lock the rear up... but he says his old Jetta, a 1990 TD could stop >>better ->>and my old 1991 Golf seemed like it could stop on a dime... until brake >>fade>>set in at least)>>
He's done tons of work on various cars (worked in a garage for a while) >>but>>he said he never did a full system flush, and doesn't know the >>procedure...>>How­ is this done - vacuum pump? Let the lines drain out?... How do you>>tackle the fluid in the master cylinder?>>
We went on to assume that once as fluid is drained you open the bleeder>>screws and bleed normally... just adding a LOT more fluid then for a >>normal>>brake job...>>
Jim B.


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CarGuru > Volkswagen > A2 Brake system flush, how to? 17 March 2005 03:19:38

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