Hi all.. Advice gratefully received for the following question....
Changed the front brakes on my Octavia 1.9 Tdi today, but after bleeding the system the brake pedal can be pushed to the floor when the engine is running... With the engine off the pedal has a little more resistance, but can still be pushed all the way down... Servo sounds like it's sucking air when I pump the pedal... Brakes were okay before apart from wearing down... Any solutions??? Thanking you all in advance..:)
Edited by Dynamic Dave on 30/10/2009 at 10:02
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Two things come to mind. One during bleeding you have exceeded the normal tracel of the pedal and damaged/flipped a master cylinder seal or Two, your model requires vagcom to activate your ABS pump to facilitate bleeding. Regards Peter
Edited by Peter D on 30/10/2009 at 10:42
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Hopefully you have not done any damage to the master cylinder and the seals within (a possibility though). Try bleeding the front and the rear brakes in the correct sequence (not sure which to do first) and keep the fluid resevoir topped up, see if that helps.
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Try a eazi bleed kit its simple to use and bleed from the furthest away working to the front, you will have trapped air in the system.
Next time when you push the piston back clamp the flexi open the bleed nipple & expell the fluid this will get rid of any moisture in the system.
Or take the cap off the master cylinder and push back slowly this is fine if nobody has topped up with fluid!
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No not do that. It is not wise to force the fluid and the debris in it back through the ABS pump. Can the OP tell us how he thinks air got in the system whilst changing the pads. Regards Peter
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It is not normally necessary to bleed brakes after a pad change;what else did you do that caused it to require bleeding?
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It is not normally necessary to bleed brakes after a pad change;what else did you do that caused it to require bleeding?
Good point.
By the way has anyone ever used one of these, it seems to make some sense but it is the opposite of conventional wisdom about seals and master cylinders etc:http: //www.youtube.com/watch?v=L0oUejw5Edc
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Macavity, I don't like the look of that tool.
I would rather flush the air out the way 99.9% of people do.
With ABS valve blocks etc... it is a 2-3 meter long labyrinth to send the air back into rather than a few inches out of the nipple.
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i remember spending hours trying to get a pedal on a marina with disc brakes and then realised the caliper was for the wrong side and so couldnt get the air out
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marina with disc brakes and then realised the caliper was for the wrong side and so couldnt get the air out
I had exactly the same with a Marina disc brake conversion on a Minor which had been done by a friend. After assembling the conversion, he couldn't get a good pedal, and he asked me to have a look at it. I have to confess it took me an embarassingly long time before the coin fell, and I registered that the two bleed nipples were pointing downwards! D'oh!
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