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Old 01-29-2010, 05:31 AM   #1
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Default overfilled master cylinder....cause this?

I'm having brake issues on my wifes 2000 jetta. Changed the brakes and now I can't get them bled properly, just can't get a stiff pedal. They will lock up, but I have to push it to the floor. Then I noticed that I've overfilled the reservoir, would this be causing my problem? I'm so fed up at this point I'm about to take it to a brake shop...
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Old 01-29-2010, 05:34 AM   #2
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Default Re: overfilled master cylinder....cause this?

I doubt an overfill can cause a soft pedal. it's just a Reservoir.
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Old 01-29-2010, 05:39 AM   #3
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Default Re: overfilled master cylinder....cause this?

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I'm having brake issues on my wifes 2000 jetta. Changed the brakes and now I can't get them bled properly, just can't get a stiff pedal. They will lock up, but I have to push it to the floor. Then I noticed that I've overfilled the reservoir, would this be causing my problem? I'm so fed up at this point I'm about to take it to a brake shop...
I found your problem.
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Old 01-29-2010, 05:40 AM   #4
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Default Re: overfilled master cylinder....cause this?

No.

How did you bleed them?
How did you compress the calipers?
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Old 01-29-2010, 05:43 AM   #5
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Default Re: overfilled master cylinder....cause this?

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I'm having brake issues on my wifes 2000 jetta. Changed the brakes and now I can't get them bled properly, just can't get a stiff pedal. They will lock up, but I have to push it to the floor. Then I noticed that I've overfilled the reservoir, would this be causing my problem? I'm so fed up at this point I'm about to take it to a brake shop...
what were the original "issues"? By "changing the brakes" you mean the pads? If so, why did you bleed the system? If you overfill the res. the only thing that happens is the excess fluid comes out the cap. If you are not getting pedal, and there are no visible leaks anywhere in the system, I would look toward the master cylinder being the issue.
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Old 01-29-2010, 05:44 AM   #6
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Default Re: overfilled master cylinder....cause this?

I've seen people open the bleeder to more easily compress the caliper.
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Old 01-29-2010, 05:46 AM   #7
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Default Re: overfilled master cylinder....cause this?

Bled at the bleeders for 3 of the 4 wheels, at the line for the other because the bleeder wouldn't budge and snapped off. Compressed by pumping the pedal, same as I've always done.
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Old 01-29-2010, 05:49 AM   #8
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Default Re: overfilled master cylinder....cause this?

Bleeding at the line will not work.
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Old 01-29-2010, 05:51 AM   #9
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Default Re: overfilled master cylinder....cause this?

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I've seen people open the bleeder to more easily compress the caliper.
I've seen this too... silly people...

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at the line for the other because the bleeder wouldn't budge and snapped off.
can't bleed from the line...
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Old 01-29-2010, 05:52 AM   #10
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Default Re: overfilled master cylinder....cause this?

Jettas are a pita...the calipers won't go back in with a c clamp like any other vehicle. I had to take them off and then pound them back in. Gently with a rubber mallet of course....
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Old 01-29-2010, 05:58 AM   #11
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Default Re: overfilled master cylinder....cause this?

Do the pistons rotate to compress?
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Old 01-29-2010, 06:03 AM   #12
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Default Re: overfilled master cylinder....cause this?

Maybe, idk. I hate this f'n car I'm only fixing it because she hit a deer with my civic.
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Old 01-29-2010, 06:23 AM   #13
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Default Re: overfilled master cylinder....cause this?

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Bleeding at the line will not work.
ive done this, and it worked for me. ive bled my clutch at the line when the bleeder snapped off, and also at the master cylinder connections and abs connections.


to OP, im trying to figure out why you needed to bleed at all. maybe if changing pads is this difficult for you, you should take the car in to a professional.
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Old 01-29-2010, 06:37 AM   #14
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Default Re: overfilled master cylinder....cause this?

I am mechanically inclined, I always do my own repairs. I just don't have the 20 years of schooling it takes to work on a volkswagen. I've done engine swaps, clutch swaps, water pumps, timing belts and countless brake jobs...... I hate vw's....
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Old 01-29-2010, 06:39 AM   #15
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Default Re: overfilled master cylinder....cause this?

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Do the pistons rotate to compress?
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Originally Posted by Cowtit View Post
Maybe, idk. I hate this f'n car I'm only fixing it because she hit a deer with my civic.
My girlfriend has a 2000 Jetta.

I can tell you from personal experience that the rear calipers screw in at a very steep pitch. The fronts are like normal, though the rubber boot sometimes jams up in the groove and makes it more difficult to press the caliper in without tearing it.

It's likely that you destroyed your rear calipers and, thus, the system is never going to work properly again. This is the price you pay for ignorance and frustration when you can go on youtube and get a video step-by-step on how to do it properly -

http://www.youtube.com/watch?v=qrjQofxd-h8

Have fun with the replacements. They're about $140 a piece.
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Old 01-29-2010, 06:39 AM   #16
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Default Re: overfilled master cylinder....cause this?

brakes are pretty universal repairs.
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Old 01-29-2010, 06:40 AM   #17
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Default Re: overfilled master cylinder....cause this?

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brakes are pretty universal repairs.
Yup. For a "very mechanically inclined" individual, the OP must not have known that 99% of all rear brake calipers are screw-type.
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Old 01-29-2010, 06:41 AM   #18
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Default Re: overfilled master cylinder....cause this?

Yea I'm curious what you changed that required you to bleed the brakes...?
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Old 01-29-2010, 06:43 AM   #19
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Default Re: overfilled master cylinder....cause this?

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Yea I'm curious what you changed that required you to bleed the brakes...?
Nothing. He just thought it would be a good idea since you're supposed to do it yearly. Unfortunately, like almost all home brake-bleeds, the system is never as firm as it was stock after you bleed them.
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Old 01-29-2010, 06:55 AM   #20
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Default Re: overfilled master cylinder....cause this?

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Nothing. He just thought it would be a good idea since you're supposed to do it yearly. Unfortunately, like almost all home brake-bleeds, the system is never as firm as it was stock after you bleed them.
Yea I had to replace a brake line on my Civic a few years ago... no matter how I bled manually, it never was the same.
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Old 01-29-2010, 06:59 AM   #21
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Default Re: overfilled master cylinder....cause this?

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Originally Posted by Archidictus View Post
Yup. For a "very mechanically inclined" individual, the OP must not have known that 99% of all rear brake calipers are screw-type.
Well than very popular chevy trailblazer must be in the 1% because I just changed those last month and guess what? Not a screw in .
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Old 01-29-2010, 07:03 AM   #22
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Default Re: overfilled master cylinder....cause this?

It all depends on the parking brake. My 2005 Odyssey has seperate brake shoes for the parking brake and a normal caliper in the rear.
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Old 01-29-2010, 07:06 AM   #23
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Default Re: overfilled master cylinder....cause this?

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Well than very popular chevy trailblazer must be in the 1% because I just changed those last month and guess what? Not a screw in .
So did you screw them in or not.
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Old 01-29-2010, 07:10 AM   #24
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Default Re: overfilled master cylinder....cause this?

No, they push back in with c clamp.
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Old 01-29-2010, 07:10 AM   #25
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Default Re: overfilled master cylinder....cause this?

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Originally Posted by Archidictus View Post
Unfortunately, like almost all home brake-bleeds, the system is never as firm as it was stock after you bleed them.
Really? I do this for almost all my friends when I change their brakes, just to clean out some nasty fluid. Every single one of them has had a firmer feel afterward. Maybe this is because I am not doing that self bleeding BS...helper on the pedal FTW!
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