2003 Vauxhall Astra Estate..Can anyone please oblige me on the easiest way to change the brake fluid..
Can it be pumped out of one bleed nipple or does it have to be done on each nipple..Thankyou
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Each and every bleed nipple longers run first and suck out the contents of the header tank and fill with new fluid before you start as that is already contaminated. Pressure bleeding is a good method, for my cars I have a spare cap with a tyre valve pulled into the lid and I use 6 or 7 psi but you do have to ensure you do not empty the header and force air into the system. Regards Peter
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Thanks for the reply Peter..I've got an "eezi bleed" one man bleeding device somewhere and if I remember correctly this works under pressure by connecting an adapter to one of the tyres ..Good idea to adapt a cap though.
I once had a golf that I had a problem bleeding the normal two man/pipe way.The air was being drawn in past the thread on the bleed nipple even though the end of pipe was in a jar of brake fluid.Took hours to realise what was happening.To make matters worse the wife was on the brake pedal...Thanks again for your advice..Regards John.G
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Ezibleed is very easy!
I always blow out with just air at first as it pushes all the old fluid, including that in the master header out. Then double bleed the system. I also put a tiny (and I mean tiny) smear of copper paste grease on the bleed nipple threads so they never corrode in. Works fine.
Don't go over 18 lbs per square inch of pressure.
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Thank you gentlemen .I'll attack the job with confidence when the weather improves.
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I would not recommend blowing air through the system for several reasons. Firstly the source of air would have to be dry air, not just from a compressor or tyre. The high air flow rate wisks the fluid droplets up into a foam and can cause air to be trapped in the system even when refilled and don't send the contents of the header tank through the system. Suck all the fluid out of the tank fill with new fresh fluid and thoroughly bleed the system. Job Done. Regards Peter
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I have never had any problem blowing out the old fluid. The advantage is that new, and old fluid don't mix. I always get a rock solid peddle, with no air in it.
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And why do old and new fluids not mix. Of coarse they mix. Test it for yourselve. Take some old and new fluid put it in a jar shake and a few days. It does not seperate. Add to this that some complex ABS systems can be a real problem to bleed so adding air is the last thing you would do. Purging with new clean fluid is the correct procedure. Regards Peter
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And why do old and new fluids not mix.
I *think* he means that there is no chance of the old and new brake fluid coming into contact with one another, ie, removing the old brake fluid from the braking system before refilling with new so that you don't get a mixture of old and new in the system.
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I'll make sure no air gets into the system.This seems to be the easiest way .As there's no air in the system to start with i am going to avoid introducing any air by making sure the header tank doesn't run low during the fluid change..Cant be any easier way surely..thanks j.g
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Dave Ahhh I see what you mean. However I would still not blow compressed air through a braking system, but everyone to his own. Regards Peter
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