Pressure Bleeding Brake with ABS
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4th Gear
Joined: Nov 2007
Posts: 311
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From: Lawton, OK
Pressure Bleeding Brake with ABS
In a recent posting, someone was having a problem getting all the air out of the brake lines when bleeding the brakes. https://www.northamericanmotoring.co...ke-issues.html
I thought I'd share something that perhaps others may have had experience with.
I thought I'd share something that perhaps others may have had experience with.
I have an R56 and have always had good luck using a Motive Pressure Bleeder http://www.jscspeed.com/universal/products/motive.htm . However, I was at the track just this weekend and was talking to a friend who said that because of the ABS, in order to bleed his 06 BMW Z4 M, he has to pump up the pressure bleeder up to 25lbs pressure. (The pressure bleeder says to only go to 20lbs). A BMW mechanic told him to do this and that 25lbs will do no harm. The mechanic also told him that as an alternative, he could pressure bleed them at 20lbs but would then need to the drive the car and make the ABS kick in, and then go back and pressure bleed them again (and maybe even a third cyle). But the mechanic said there was really no point in the 2nd alternative method because 25lbs would not hurt anything.
My friend has pressure bleed his brakes serveral times at 25lbs and says it always works great.
My friend has pressure bleed his brakes serveral times at 25lbs and says it always works great.
I've bled mine with 25-30psi of pressure, and it still won't get air out of the ABS if you have some in there from bleeding the reservoir dry at some point. I've heard others suggest the "drive and make the ABS kick in" idea - and it's a good idea - though I wonder if that will *really* get the bubbles all the way out of the ABS unit - the actual fluid doesn't move very far when you push the pedal... it just pressurizes and flows a *tiny* bit to move the pistons less than a mm...
The dealer scan tool can put the ABS in "Air Bleed" mode - you can also do it with the AutoEnginuity Scan Tool with the BMW/MINI extensions.
The dealer scan tool can put the ABS in "Air Bleed" mode - you can also do it with the AutoEnginuity Scan Tool with the BMW/MINI extensions.
I don't think either method is gonna get all the air out of the ABS nooks and crannies without a method to open the valves in the ABS unit.
But - again - if you never run your system dry, you shouldn't have to worry about that. I do, because I was careless once...
But - again - if you never run your system dry, you shouldn't have to worry about that. I do, because I was careless once...
6th Gear
Joined: Jul 2008
Posts: 1,513
Likes: 1
As long as you don't run the resv. dry, you don't need to worry about pressure.
One often missed trick when doing a pressure bleed is after you pump up the bottle let a little air out of the resv. This will allow some of the fluid to move thru the filler line thus eliminating some of the air that gets forced into the resv.
One often missed trick when doing a pressure bleed is after you pump up the bottle let a little air out of the resv. This will allow some of the fluid to move thru the filler line thus eliminating some of the air that gets forced into the resv.
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