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Old 24-11-2007, 03:29 PM   #1
JMO
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Default Brake Fluid Flush

Hi guys.


I found this (below) on another post and have a quick question to ask.

What does he mean when he says to suck out all of the brake fluid from the reservoir - how much do you take out. ie. do you suck it out to the minimum mark? cause i thought it could not drop below this mark.

Any help would be appreciated.


Quote:
basically if ya want flush your brake fluid what ya need to do is
1. remove all wheels so you can access the brake calipers
2.suck out all the old brake fluid out of the master cylinder resivour and refill with new fluid
3.starting at the lhr wheel and moving to rhr then lhf and finally rhf...get someone to pump the brake pedal whilst you open the brake bleeder nipple....(IE keep an eye on the resivour making sure it doesnt run dry) this will pump the new fluid through the line flushing out all the old fluid...youl see the new fluid come out...
4.make sure there is no air left in the line and then move on to next wheel..
5.easy as that...
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Old 24-11-2007, 07:15 PM   #2
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If you are going to ..bleed.. the brakes dont worry about the mark.
If you are ..just.. replacing the fluid dont go below the mark.
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Old 24-11-2007, 07:30 PM   #3
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I want to get rid of all the old fluid out of the system. If i don't take out all the old fluid from the reservoir, isn't the new fluid going to mix with the old fluid?
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Old 24-11-2007, 08:29 PM   #4
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Quote:
2.suck out all the old brake fluid out of the master cylinder resivour and refill with new fluid
This means sucking it out with a large syringe or similar, once empty refill with the new fluid then start the bleed process, you should be able to tell the difference between the old oil and the new oil.
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Old 24-11-2007, 08:51 PM   #5
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So suck all the fluid out, not just up to the minimum mark.
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Old 24-11-2007, 09:24 PM   #6
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yep suck it ALL out and refill with new stuff then flush it through the lines....
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Old 24-11-2007, 09:28 PM   #7
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Thanks for the help guys. I'll give it a go tomorrow.
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Old 25-11-2007, 11:20 AM   #8
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Just doing it now. I'm having trouble keeping the fluid clean. Every time i let go of the pedal, dirty fluid is sucked back into the cylinder. Is this possibly because there is air in the lines, because i've taken all the calipers off and have just put them back on? How do i do it right?

Thanks.
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Old 25-11-2007, 11:28 AM   #9
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this is where 2 people make it handy, one person pumps the brakes then when the new fluid comes through and or the air bubbles are gone you hold the pedal down, then the second person is at the caliper and can close off the bleed screw.

...hope that made sense
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Old 25-11-2007, 11:31 AM   #10
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Careful; taking all the fluid out of a master cylinder will often mean you need to then bench bleed the master cylinder so there is no air in it and it continues to work correctly.

The easiest way to bench bleed is to remove the master cylinder and immerse it it completely in an old clean plastic ice-cream container or similar fill of new brake fluid and pump the piston rod until all air bubbles vanish; remove from fluid keeping all the fluid in it, replace lid and replace in the car. The other way is to make new tubes from the outlet lines that bend up into the reservoirs filled with new fluid and pump until all bubbles disappear. The last method is the factory solution and cheaper in terms of brake fluid used but takes a little more time to make up the bleeding pipes.
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Old 25-11-2007, 11:32 AM   #11
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Thats what i've been doing but the tank in cylinder in the engine bay started off with 'yellow' brake fluid and it has slowly gone a 'green' (old fluid) colour. Is it happening because of the old fluid in the lines to the other 3 calipers?

Is that normal and do i have to just keep pumping until it doesn't turn green in the cylinder anymore?
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Old 25-11-2007, 11:39 AM   #12
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Yes it's the old fluid. Keep pumping until you get new clean correctly coloured fluid at each wheel cylinder.
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Old 25-11-2007, 11:44 AM   #13
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In case i'm confusing anyone, the fluid in the 'master cylinder' is turning a green/black colour while bleeding the back left. It keeps going this colour and won't stay clean, even after topping up with new fluid. Should i drain all the old fluid from all four calipers, then go back to the start with all new fluid to clean it properly?
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Old 25-11-2007, 12:22 PM   #14
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It sounds as if you are not closing the bleeding nipple before letting go of the brake pedal.
You get someone to hold pressure on the brake pedal then just crack open the bleeding nipple. When the brake peddle hits the floor hold it and do up the nipple.
Pump the brake peddle and do this again until the new fluid flows through
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Old 25-11-2007, 12:36 PM   #15
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So the procedure is:

1.Loosen nipple.
2. Pump pedal once.
3. Tighten nipple.
4. Release pedal.

Repeat until fluid is clear.

-OR-

Do i just hold the pedal down until the collector bottle is full, then tighten the nipple?

Last edited by JMO; 25-11-2007 at 12:41 PM.
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Old 25-11-2007, 06:16 PM   #16
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If you just hold the pedal down I don't think the collector bottle will fill.
You need to
1. Pump then hold pressure on the brake pedal
2. Loosen nipple
3. When brake pedal hits the floor tighten nipple and then release brake pedal
4. Redo steps 1-3 until new fluid flows through

Make sure you don't let the reservoir run out of fluid or air will enter the system
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Old 25-11-2007, 07:53 PM   #17
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Thanks peterban. All done now. One last thing, The rubber seal that goes on before the lid on the master cylinder, how are the rubber button things meant to be? pushed all the way in (sitting flush) or pushed all the way out?

Thanks for all the help so far.
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Old 25-11-2007, 09:03 PM   #18
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When I took the old one out they were pushed all the way out. On the new one in the m/cyl overhaul kit they were flat. I just put it in flat, but I've bled the brakes before and put it back the way it came out... take your pick.
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Old 25-11-2007, 10:47 PM   #19
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they are ment to sit flush.....
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