Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: V6 CDX-er on 31 January 2011, 17:15:01
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Firstly, sorry for what may seem like a stupid question chaps.
A bit of background. I had a seized rear caliper, (off side), which I've replaced. During which, because I had sprained the flange nut without realising, I ended up loosing most of my brake fluid.
I had a mate come round the other day to help bleeding the brakes using the old two-man method. After a couple of hours we still hadn't managed to bleed even the first caliper, (near side rear). I had the jar end of the tube submerged in brake fluid so as not to suck any air back into the system, and he kept his foot on the brake untill I had shut the bleed nipple on the caliper.
He would pump and hold, I'd open the nipple and some fluid would come out followed by loads of air bubbles. Then the pressure would drop, requiring me to close the nipple and him to pump again. As I said, this went on for a couple of hours untill late into the night. At that point we called it a day, and I bought a Gunson's Ezzi-bleed the next day.
So, here's my question.....
When I'm using the Ezzi-bleed and I open the bleed nipples, (so far done near side rear and off side front), I'm not seeing any air bubble escape from the tube attached to the bleed nipple. I'd have thought that the brake fluid being injected under pressure would force the air out of each caliper once the bleed nipple was opened, therefore making it clearly visible through the bleed tube attached to the caliper?
One thing of note is that the clear plastic tube attached to the cap that fits onto the master cylinder does leak fluid ever so slightly. Surely it cant be likely that any air in the system is being purged at this point?
Or is what's happening perfectly normal?
Just one quick word of warning though chaps. The first time I attached the Ezzi-bleed and pressured up the system, I ended up with a huge spurt of brake fluid exiting the tube that goes from the bottle to the master cylinder. This was caused by a tiny split in the clear plastic pipe. I took it back to Halfords and we looked at all the other eight items that they had in stock and all eight had the same defect. The hole / split was so small that you could hardly see it with your eyes, but you could feel it by running the edge of your finger nail along the pipe. Problem was solved by pulling the pipe off and cutting a little bit away.
In advance, cheers :y
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Make sure you are not using a fully inflated tyre. Max 15PSI I believe with these kits?
:y
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Make sure you are not using a fully inflated tyre. Max 15PSI I believe with these kits?
:y
I'm using a space saver placed on top of the engine. Running it about 16-17psi as checked on one of those digital pressure gauges.
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I've converted my ezzi bleed so i can use it from the compressor and have the air regulator turned right dow to a couple of PSI.
This means i don't have fluid pi**ing all over the paint work and i can take my time on each wheel. Done this yesterday on the Nova Redtop I'm building
Andy
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I never use the res tanks with fluid in that come with the kit. I simply fill the brake fluid reservoir between each corner and use the kit to do nothing more than pressurise the system
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I never use the res tanks with fluid in that come with the kit. I simply fill the brake fluid reservoir between each corner and use the kit to do nothing more than pressurise the system
Me too. :y Saves having brake fluid leaking everywhere.
Kevin
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I havent used an eazy bleed in years, but I seem to recall that they used a pipe with a bung in one end and a small split in the pipe that acted like a one way valve in that it opened up to eject fluid under pressure, but then closed up to prevent air getting in when the pedal was released?
Is it possible you are using the wrong pipe on the master cylinder end?
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If used correctly you should not have brake fluid going anywhere you don't want it to. :y
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If used correctly you should not have brake fluid going anywhere you don't want it to. :y
Depends how good the seals are. "Not very" once they've been used a couple of times, in my experience.
Kevin
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If used correctly you should not have brake fluid going anywhere you don't want it to. :y
Depends how good the seals are. "Not very" once they've been used a couple of times, in my experience.
Kevin
He's just bought it new apparently, unless he got it from a car boot sale :)
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I havent used an eazy bleed in years, but I seem to recall that they used a pipe with a bung in one end and a small split in the pipe that acted like a one way valve in that it opened up to eject fluid under pressure, but then closed up to prevent air getting in when the pedal was released?
Is it possible you are using the wrong pipe on the master cylinder end?
Easibleed works by pressurising the system. No need to depress the brake pedal.
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Yes the one I presently use is fairly new, I used to use my neighbours which has been well used but still didn't leak if used at the lower pressure, If the seals leak then replace them.
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I havent used an eazy bleed in years, but I seem to recall that they used a pipe with a bung in one end and a small split in the pipe that acted like a one way valve in that it opened up to eject fluid under pressure, but then closed up to prevent air getting in when the pedal was released?
Is it possible you are using the wrong pipe on the master cylinder end?
That's not an Eazi-bleed. You're describing a very basic one man bleeding kit. ;)
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If used correctly you should not have brake fluid going anywhere you don't want it to. :y
Fluid leak only occuring because of a split in the pipe, (now fixed), but this is now not a tight fit, so there is a little seepage.
What I'm more concerned about is the fact that despite there being plenty of air in the system, I don't seem to be getting any air bubbles coming out of the calipers when I'm bleeding the brakes.
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If used correctly you should not have brake fluid going anywhere you don't want it to. :y
Fluid leak only occuring because of a split in the pipe, (now fixed), but this is now not a tight fit, so there is a little seepage.
What I'm more concerned about is the fact that despite there being plenty of air in the system, I don't seem to be getting any air bubbles coming out of the calipers when I'm bleeding the brakes.
Is fluid coming out of the nipple? If so, then you can be quite sure there is no air in the line. No bubbles = no air.
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I find the eezibleed so easy to use. I make sure the front off side wheel has it's valve at top of wheel then reduce the pressure to 10 to 15 psi, top up the eesibleed bottle and hang safely from the bonnet hinge, then remove the master cylinder top, connect the bottle tube to the top of the master cylinder via the eezibleed dummy master cylinder screwcap then connect the airline to the tyre valve and now the brake system is pressured up any opened nipple will now release fluid under pressure along with any air in that part of the system,no need even to have a tube on the nipple other than to observe the expelled fluid condition and direct it into container. of course I keep an eye on the fluid bottle level My eezibleed is a few yrs old and has never given leakage of either air pressure or fluid obviously the integrity of the banjo joints in the 2 screw caps needs to be 100%. Worth a mention that both ends of the plastic fluid pipe in the 2 screwcaps have metal tube lineing the inner bores to take the compression of the banjo joints.The last time I used mine was to renew the complete system fluid on my own,so easy just opened up each nipple in the proper sequence untill new fluid appeared :y
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Good job Cliffo. :y
Mine is about 3 or 4 years old. I've never used it to just 'bleed' the braking system, but have successfully used it on several cars to do a fluid replacement.
I too have no problems with leaking seals..... I do however use a spare, spare tyre which is as flat as the proverbial. ;D
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So just to check I've read correctly. Two man pedal method with a pipe on the nipple didn't work as there was air constantly visible in the bleed tube to jar.
Then got an easy bleed from Halfords and tried again, no air no problem.
That being the case I wonder if the pipe initialy used with the two man method was not sealed at the nipple end and allowing air in? So the air was not from the caliper at all? Does the pedal feel any firmer now there is no air in the bleed pipe. If not that might confirm it...?
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So just to check I've read correctly. Two man pedal method with a pipe on the nipple didn't work as there was air constantly visible in the bleed tube to jar.
Then got an easy bleed from Halfords and tried again, no air no problem.
That being the case I wonder if the pipe initialy used with the two man method was not sealed at the nipple end and allowing air in? So the air was not from the caliper at all? Does the pedal feel any firmer now there is no air in the bleed pipe. If not that might confirm it...?
Correct Chris.
99.9% sure that the pipe over the bleed nipple on the first caliper was pushed in properly. Not had time to finish off the last two calipers yet, so don't know about any improvement in pedal feel.
What's confused me a little bit is the huge amount of air coming out of the bleed nipple / waste pipe using the two man method, but seemingly zero coming out when using the Ezzi-Bleed.
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So just to check I've read correctly. Two man pedal method with a pipe on the nipple didn't work as there was air constantly visible in the bleed tube to jar.
Then got an easy bleed from Halfords and tried again, no air no problem.
That being the case I wonder if the pipe initialy used with the two man method was not sealed at the nipple end and allowing air in? So the air was not from the caliper at all? Does the pedal feel any firmer now there is no air in the bleed pipe. If not that might confirm it...?
Correct Chris.
99.9% sure that the pipe over the bleed nipple on the first caliper was pushed in properly. Not had time to finish off the last two calipers yet, so don't know about any improvement in pedal feel.
What's confused me a little bit is the huge amount of air coming out of the bleed nipple / waste pipe using the two man method, but seemingly zero coming out when using the Ezzi-Bleed.
Or slop in the nipple thread to caliper...? It can be a right bugger though, had some mares with bikes over the years.