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Forum LockedW8 brake trouble...

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JohnnyB View Drop Down
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  Quote JohnnyB Quote  Post ReplyReply Direct Link To This Post Topic: W8 brake trouble...
    Posted: 23-Feb-2009 at 11:13
So I did what turns out to be a really dumb thing yesterday... I decided to take the opportunity of using a heated garage space to change the pads on the W8 while it was the only "drivable" vehicle in my possession .

The pad exchange itself went smoothly and I got everything reassembled and ready for a test drive. First thing I did was to (as recommended in the Bentley) pump the pedal to build up pressure in the system, however, the pedal went to the floor and wouldn't come back up. I pumped it several more times and it slowly started to return to about 2/3 of the way up, but no further. I briefly drove around the block to see if that would help, but all four brakes dragged the entire drive, and I've not been able to determine what happened, why it happened, or how to fix it...

Anybody have any suggestions?
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pantera1683 View Drop Down
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  Quote pantera1683 Quote  Post ReplyReply Direct Link To This Post Posted: 23-Feb-2009 at 12:38
Maybe you need to bleed the brakes. You might have gotten air in the system.
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B5crazy View Drop Down
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  Quote B5crazy Quote  Post ReplyReply Direct Link To This Post Posted: 23-Feb-2009 at 13:23
Is the reservoir full of fluid and did you tighten the cap completely?
2004 W8 Variant 6MT Pacific Blue/Grey
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Manowar View Drop Down
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  Quote Manowar Quote  Post ReplyReply Direct Link To This Post Posted: 23-Feb-2009 at 13:35
Definitely chech the above and re-bleed the system.Use the correct DOT 4.
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jeffsu350 View Drop Down
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  Quote jeffsu350 Quote  Post ReplyReply Direct Link To This Post Posted: 23-Feb-2009 at 19:19
Unless I am missing something, it doesn't sounds like you touched the brake fluid or the brake lines.

It sounds more like a piston did not get pushed back in properly and is jammed, maybe it is twisted???

If you bled the brakes, I would rebleed them. Its not a bad idea to do anyway, it should be done every two years regardless of miles.

good luck
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jmc_w8 View Drop Down
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  Quote jmc_w8 Quote  Post ReplyReply Direct Link To This Post Posted: 23-Feb-2009 at 20:59
Johnny B, are we talking about front or rear brakes? And if rear, did you use a tool that rotates the piston while pushing? Here is an example of such a tool:

Brake Tool

Edited by jmc_w8 - 23-Feb-2009 at 21:02
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JohnnyB View Drop Down
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  Quote JohnnyB Quote  Post ReplyReply Direct Link To This Post Posted: 24-Feb-2009 at 11:28
I rechecked all the work and manually bled all four calipers... Rotors remained free if the car was turned off and the pedal was manually lifted to the top of it's travel. However, start the engine and the rotors dragged/stop and the pedal would not stay at full lift... This suggested some sort of booster/vacuum problem to me, but I had no idea what could've caused it.

Turned out, the pedal was caught on a part of the underside/kickpanel of the dash that snagged on it when it went all the way to the floor the first time. That's all that was keeping the pedal from returning to full up.
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B5crazy View Drop Down
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  Quote B5crazy Quote  Post ReplyReply Direct Link To This Post Posted: 24-Feb-2009 at 16:35
Glad to hear all is back to normal.
2004 W8 Variant 6MT Pacific Blue/Grey
1992 Cabriolet
2012 Golf R 4dr CW

http://mysite.verizon.net/b5crazy/
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BlueSteW8 View Drop Down
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  Quote BlueSteW8 Quote  Post ReplyReply Direct Link To This Post Posted: 20-Mar-2009 at 14:27
Put a chunk of 2x4 under the pedal - it really shouldn't go "all the way to the floor" if I remember the procedure in Bentley correctly.

Edited by BlueSteW8 - 20-Mar-2009 at 14:28
2003 W8 Tip Limousine - locked in sports mode
GIAC pump/stock/ race files
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