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#1
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Unable to bleed Rear brakes
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#2
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I think your first step is to try a full bleeding procedure. You can't do that by just cracking a line on the ABS module, as there are valves in there and they hold trapped air. The correct procedure is to bleed it manually (or with a power bleeder) while the BMW service computer is hooked up to it. The computer is used to run a service program and cycle all the valves, so that you can get the air out. A dealer can do this procedure, or a good independent mechanic with the right tools (GT1 or similar).
If the bleeding procedure does not work when done as described above, or if the BMW computer shows faults on the ABS control module, then replacing that module would likely be the next step (again, followed by the full bleeding procedure). Edit: Here is a link to a post with some discussion on this: http://www.xoutpost.com/655315-post7.html
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue Last edited by JCL; 01-11-2011 at 02:24 PM. |
#3
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Activate (safely) the abs on some snow/ice/water/gravel/whatever. See if the rear brakes get working again or if there is a change in pedal feel (i.e., the air bubble moved out of the abs unit and into the lines).
Activating the abs on the race car after a bleed was standard, just to keep things moving through the pump.
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Kirk Las Vegas 2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo 2011 E90M3, 6-speed manual |
#4
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If it comes down to replacement, check out BBA Reman for a re-manufactured unit and save some $$.
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---------------------------------------------- 2006 X5 3.0L - Schwarz Black/Truffle Brown Stock But I keep it clean |
#5
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Thanks guys. I did try to power bleed all lines, and when I crack the two rear...nothing comes out, nothing. I tried to activate the abs on a gravel road, but the pedal is too soft. Is there a way to jumper the abs pump using the relay? I read a thread about it a while back but cant seem to find it now.
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#6
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Quote:
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#7
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I agree. You have a bigger problem than a simple DIY pressure bleed can fix.
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Kirk Las Vegas 2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo 2011 E90M3, 6-speed manual |
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abs, abs dsc, abs module, brake bleeding |
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