'68 911 Brake Caliper Bleeding Nut Position

[68911USA]

Uh...I might have really done it this time! I have had all four brake calipers rebuilt and reinstalled them on the car. I now have a fluid leak from the top of the master cylinder that will eventually drain the container all the way down if I pump the brakes to try to build pressure in the system. Everything in there looks okay, as in the lines seem to connect properly to the top of the master cylinder, and the seals look good and pliable. The master cylinder is supposedly less than a year old. After looking at some photos, it would appear that the brake bleeding nuts (nipples?) on my car are all pointed DOWN TOWARDS THE GROUND, and I am wondering if this is the problem. If I have put all four calipers on BACKWARDS, this would cause this orientation difference, and maybe helping cause a pressure problem in the system that could be causing the leak. If I take all the calipers off and swap them side to side so the bleeders POINT UP, is this what I should do? I also replaced all the rubber lines from the hard lines to the calipers while I was having them rebuilt. Once again, my DIY project has taken a turn! Thanks a ton, it never occured to me to pay attention to this detail before I bolted them all on again!

[68911USA]

Answered. Looks like I will be swapping the calipers around! I've done it again...

[Neunelfer]

Bleeders (and air bubbles) are always at the top. Fun huh?

[68911USA]

...and it still leaks. I think when I moved it around to remove/reinstall the pedal cluster, I unseated the gravity lines. Can't seem to get them to seat any farther down, either...

[Neunelfer]

I was afraid of that. Those are very tough... I don't really know what to tell you. You should probably get new grommets and get everything seated properly. Although... most M/C's come with new grommets. They may be ok but, take them out, seat the lines and reseat the grommets at least.

Good luck.

[davep]

The MC has washers in the holes for the metal tubes to seat on. These washers are under the rubber grommets. Without the washers the tubes go in too far and may not seal. Not much to do but to loosen everything and try to find out if the washers are there, then try and get the tubes to seat correctly. It can be a real bear, having done it a dozen times or more. Sometimes I move the pedal cluster back to get more wiggle room. You can never get air bubbles out of calipers with the bleed nipples on the bottom.