PSA: 997 brake bleeding fail and sinking pedal fix
#16
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I just did this process with my Launch x431 V. I thought something was wrong at first because the left side was first and the pump never came on. I went back and read this post again and noticed the part in your post where you had the same experience. Thanks for posting that part or I would have stopped right then.
On my 981 Boxster S the dry pressure bleed could not be used because while the left front and rear only bleed off about 150ml each, the right front bleeds off about 400ml with the x431 automated ABS bleed. Luckily I had a friend pumping the pedal while I watched the catch bottle so I was able to shut the bleeder valve at just over 300ml and abort the process before the master cylinder ran dry. We restarted the process and it went like this:
left rear: 30 second countdown ended at 0 and bleed off about 150ml. No noticeable ABS activity while smoothly pumping break pedal.
left front: 30 second countdown that ended at about 5 and bleed off about 150ml. No noticeable ABS activity while smoothly pumping break pedal.
right front: 180 second countdown that ended at about 30 and bleed off about 400ml. Lots of noticeable ABS activity while smoothly pumping break pedal.
right rear: 180 second countdown that ended at about 40 and bleed off about 250ml. Lots of noticeable ABS activity while smoothly pumping break pedal.
I then went back and bleed off about 50ml at each inside caliper nipple.
I will be doing this again on my 997.2 Targa soon and I will post those details here as well.
Jeff
On my 981 Boxster S the dry pressure bleed could not be used because while the left front and rear only bleed off about 150ml each, the right front bleeds off about 400ml with the x431 automated ABS bleed. Luckily I had a friend pumping the pedal while I watched the catch bottle so I was able to shut the bleeder valve at just over 300ml and abort the process before the master cylinder ran dry. We restarted the process and it went like this:
left rear: 30 second countdown ended at 0 and bleed off about 150ml. No noticeable ABS activity while smoothly pumping break pedal.
left front: 30 second countdown that ended at about 5 and bleed off about 150ml. No noticeable ABS activity while smoothly pumping break pedal.
right front: 180 second countdown that ended at about 30 and bleed off about 400ml. Lots of noticeable ABS activity while smoothly pumping break pedal.
right rear: 180 second countdown that ended at about 40 and bleed off about 250ml. Lots of noticeable ABS activity while smoothly pumping break pedal.
I then went back and bleed off about 50ml at each inside caliper nipple.
I will be doing this again on my 997.2 Targa soon and I will post those details here as well.
Jeff
#17
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I have gone to a heavier duty tubing, I forgot where it came from, so far it hasn't burst, fingers crossed....
#18
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I just did this process with my Launch x431 V. I thought something was wrong at first because the left side was first and the pump never came on. I went back and read this post again and noticed the part in your post where you had the same experience. Thanks for posting that part or I would have stopped right then.
On my 981 Boxster S the dry pressure bleed could not be used because while the left front and rear only bleed off about 150ml each, the right front bleeds off about 400ml with the x431 automated ABS bleed. Luckily I had a friend pumping the pedal while I watched the catch bottle so I was able to shut the bleeder valve at just over 300ml and abort the process before the master cylinder ran dry. We restarted the process and it went like this:
left rear: 30 second countdown ended at 0 and bleed off about 150ml. No noticeable ABS activity while smoothly pumping break pedal.
left front: 30 second countdown that ended at about 5 and bleed off about 150ml. No noticeable ABS activity while smoothly pumping break pedal.
right front: 180 second countdown that ended at about 30 and bleed off about 400ml. Lots of noticeable ABS activity while smoothly pumping break pedal.
right rear: 180 second countdown that ended at about 40 and bleed off about 250ml. Lots of noticeable ABS activity while smoothly pumping break pedal.
I then went back and bleed off about 50ml at each inside caliper nipple.
I will be doing this again on my 997.2 Targa soon and I will post those details here as well.
Jeff
On my 981 Boxster S the dry pressure bleed could not be used because while the left front and rear only bleed off about 150ml each, the right front bleeds off about 400ml with the x431 automated ABS bleed. Luckily I had a friend pumping the pedal while I watched the catch bottle so I was able to shut the bleeder valve at just over 300ml and abort the process before the master cylinder ran dry. We restarted the process and it went like this:
left rear: 30 second countdown ended at 0 and bleed off about 150ml. No noticeable ABS activity while smoothly pumping break pedal.
left front: 30 second countdown that ended at about 5 and bleed off about 150ml. No noticeable ABS activity while smoothly pumping break pedal.
right front: 180 second countdown that ended at about 30 and bleed off about 400ml. Lots of noticeable ABS activity while smoothly pumping break pedal.
right rear: 180 second countdown that ended at about 40 and bleed off about 250ml. Lots of noticeable ABS activity while smoothly pumping break pedal.
I then went back and bleed off about 50ml at each inside caliper nipple.
I will be doing this again on my 997.2 Targa soon and I will post those details here as well.
Jeff
Last edited by Brainz; 11-21-2020 at 09:52 AM.