rdodger
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| posted on 4/3/13 at 07:36 PM |
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Bleeding Wilwood calipers. Again!
Evening all.
I have searched and read a lot about this.
So far I have:
Bled the master cylinder. Left a soft pedal.
Checked the alignment with the discs. Soft pedal.
Vacuum bled. Left a soft pedal.
Manually bled. LASP.
Pressure bled with eezibleed. LASP.
Gravity bled. LASP.
Removed calipers, pushed the pistons half out onto wood spacers. Bled again. LASP.
Currently have the calipers suspended above the car, above the master cylinder with the eezibleed keeping it all under pressure. I plan to turn them
and bleed every 12 hours or so.
Anything else I can do? I am pulling my hair out!
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theprisioner
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| posted on 4/3/13 at 07:41 PM |
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I suppose it won't the obvious, I did on my Willwoods and had a similar result to your experiance. My Midlites have 4 nipples, I only saw the
inner ones when I came to bleed the brakes Daaaaaa.........
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Wadders
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| posted on 4/3/13 at 07:56 PM |
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Try using the eezybleed again, but unbolt the calipers and play about with them as you bleed
i.e turn them upside down and on their side etc, nip the bleed nipple up and then repeat a time or two
it's amazing how many air bubbles you can coax out.
Al.
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ashg
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| posted on 4/3/13 at 08:35 PM |
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what master cylinder do you have? also have you fitted one of those brake light pressure switches? if you have bin it and put a plug/bleed nipple in
its place then fit a micro switch to the pedal. could never get a good pedal with one of those pressure switches in the system.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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rdodger
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| posted on 4/3/13 at 08:38 PM |
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Fiat 126 master cylinder. (pics on the master cylinder thread)
I don't have a pressure switch. I have a plunger on the pedal.
Any other ideas?
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mark chandler
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| posted on 4/3/13 at 09:02 PM |
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Clamp each flex pipe in turn and localise, if you end up with all flex pipes clamped and a soft pedal look towards the master cylinder
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rdodger
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| posted on 4/3/13 at 09:33 PM |
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I have braided hoses so I believe I can't clamp them without damaging them?
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ashg
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| posted on 4/3/13 at 09:38 PM |
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any chance the mc was from brakes international? they sent me a duff brand new one, sent it back and they said it was fine and wouldnt give me my
money back. ordered a new one off a chap on ebay and the problem magically went away!
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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Jimfin
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| posted on 4/3/13 at 09:56 PM |
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Using new quality branded brake fluid from a sealed can?
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Westy1994
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| posted on 4/3/13 at 10:05 PM |
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I ran some years ago and on another car Wilwoods, I had issues as well, removing to get them higher than the master cylinder was the cure, but really
should not been necessary. Can you blank off the master cylinder to make sure its not that , if bleeding by all means does not work?.
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rdodger
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| posted on 4/3/13 at 10:13 PM |
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Not sure on the source of the MC as it came with the kit.
It was new to start with. I will go and get some new fluid tomorrow and flush through. It's been round and around a few times so probably a good
idea.
I will bleed them above the MC, tapping and rolling as I go.
Fingers crossed!
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Oddified
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| posted on 5/3/13 at 08:58 AM |
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Is it possible that the soft peddle is because you'll have new pads/disc's which aren't bedded in. More often than not that will
also make the brakes feel like there's air in them until they've done a few miles.
Ian
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maccmike
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| posted on 5/3/13 at 08:59 AM |
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unscrewing and blanking the mc where the pipes screw in will diagnose if its the master cyl.
make sure youve got ptfe tape on the nipples, surprising how much air get sqeeze through when bleeding
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adithorp
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| posted on 5/3/13 at 10:17 AM |
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You have bled from both top bleed nipples haven't you? Someone on here posted similar recently and had only bled from one nipple.
If not that would you like me to come and give you a hand. Bleeding brakes is one of those things that gets easier when you've done it a
thousand times.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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rdodger
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| posted on 5/3/13 at 06:29 PM |
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Hi Adi
Yes I have bled inner and outer nipples.
Over night I had the calipers as high as poss and got some air out today when I ran the new fluid through. I will bleed again tomorrow and refit them.
Fingers crossed!
If no improvement you may well get a call for help Adi.
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britishtrident
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| posted on 5/3/13 at 07:42 PM |
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If you use more than about 300ml bleeding a system something is wrong. You can often encounter leaks in the system where there is no apparent fluid
leakage but air is drawn back into the system, so the first task is to go round every joint on the system and examine it while an assistant keeps the
system under pressure -- to be extra sure tighten up every joint. Note this includes the joints on the flex hose assemblies. In the past have
encountered braided hoses that were faulty out of the box so don't assume because they are new they are OK.
If that doesn’t work you have track down where the spongeyness is as you have braided flex hoses the only way to do this is by disconnecting pipes
and inserting bleed nipples to blank off outlets.
I would start by fitting bleed nipples into the front T piece and giving the front circuit a single pump bleed. if you get a solid pedal you know
the problem is between the front T and the front wheels.
If no improvement try the same at the rear.
If still no improvement test each circuit by screwing bleed nipples directly into the master cylinder ports.
[Edited on 5/3/13 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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rdodger
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| posted on 5/3/13 at 09:50 PM |
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Thanks for the advice.
I have got some air out today so am hopeful it will be ok. If not it looks like I need to order some bleed nipples.
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rdodger
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| posted on 6/3/13 at 05:16 PM |
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Update
Well it is a lot better! Phew!
It's not rock hard but I am putting that down to the pads/discs being new and not bedded in. I guess time will tell!
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jossey
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| posted on 8/3/13 at 12:46 PM |
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Are the wheels on when you bleed them in other words are the discs free to move give the feeling off soft pedal.
Thanks
David Johnson
Building my tiger avon slowly but surely.
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INDY BIRD
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| posted on 8/3/13 at 02:01 PM |
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Also check no air trapped in the brake light switch as can happen. Just undo a small amOunt to bleed, I found it best
To pumP the peddle and hold it down over night with a device Ie I used a broom and then try each one as pushes all the air
To the caliper
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rdodger
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| posted on 8/3/13 at 05:30 PM |
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quote:
Originally posted by jossey
Are the wheels on when you bleed them in other words are the discs free to move give the feeling off soft pedal.
Good point.
The wheels were off the car. I did try it with the wheel nuts on tightened to the discs. I will pop the wheels on tomorrow and see if it firms up some
more.
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jossey
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| posted on 9/3/13 at 07:21 PM |
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quote:
Originally posted by rdodger
quote:
Originally posted by jossey
Are the wheels on when you bleed them in other words are the discs free to move give the feeling off soft pedal.
Good point.
The wheels were off the car. I did try it with the wheel nuts on tightened to the discs. I will pop the wheels on tomorrow and see if it firms up some
more.
They will just make the pedal feel soft...
Let me know how it goes...
Thanks
David Johnson
Building my tiger avon slowly but surely.
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Yodaknowscncs
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| posted on 28/3/13 at 10:12 PM |
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Hi,
Have you consider that you might not be shifting enough brake fluid into your new wilwoods, were your old calipers twin pots and the wilwoods 4 pots,
using larger pistons acting on the discs, thus the mc doesn't have enough fluid inside it to generate the pressure needed?
Cheers
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