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#1
05-03-2017, 12:46 PM
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X5 doesn't stay stopped
I replaced the front pads first as they were already pretty shot. Didn't help I flushed the brake system hoping it was an air bubble. Didn't help I'm thinking the next step is to replace the master cylinder, but I'm a little apprehensive to do so since I don't have any codes for it and I don't lose pedal pressure. Other ideas: Bad DSC unit, bad brake booster, rotors too smooth? Is this too out there? Anyways, if anyone has had a similar problem or has some info for me it would be greatly appreciated. Thanks in advance! 
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#2
05-03-2017, 01:45 PM
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could be vacuum related or something in the booster.
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#3
05-03-2017, 02:00 PM
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That was my other thought. Since the brake pedal doesn't soften up when depressed is it safe to assume the master cylinder is good? Car is reaching 150k should I just replace it anyway since I have to take it off to get to the booster?
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#4
05-03-2017, 02:19 PM
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/www.youtube.com/watch?v=QogQ8Ip04Vk
__________________
 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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#5
05-03-2017, 03:21 PM
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Quote:
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#6
05-03-2017, 05:01 PM
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Quote:
My 86' C20 pick up had horrible brakes and was showing the same symptoms that your X is showing. We replaced the brake master cylinder, rebuilt the calipers, and bled the brakes many times. The engine needed replaced and when we did the swap (all of the vacuum lines were replaced) The brakes came back and the truck stopped like it was new.
__________________
Running: 2001 E53 3.0i Black 5MT Style 87, Eibach Swaybars, Headers, Turner Monoball Bushings, Oil pump nut fix, E60 short shifter + ZHP shift knob, Sport Swap 204K (G-power supercharger coming soon) 2011 E70 35d Blue Style 214 3" exhaust, Dudmd stage 2, 2" HR lowering springs 2012 E70 35d Black Style 215 Sold: 2002 e39 540i 6MT Black sport, M5 LSD, M60 Intake manifold 2003 e39 525i Auto Grey Sport 
Last edited by Skeletor; 05-03-2017 at 05:11 PM.
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#7
05-03-2017, 06:54 PM
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https://www.youtube.com/watch?v=QogQ8Ip04Vk
The link I posted is to confirm there is as issue with or connected to the booster. Obviously, that can be a vacuum hose. I would first do the test and if it shows there is a booster connected problem then check the hoses though it is also easy to just draw a vacuum at the booster to see if it will hold for a minute or so. That will confirm if it is the booster itself or lack of necessary vacuum.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas Last edited by bcredliner; 05-03-2017 at 07:47 PM.
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#8
05-03-2017, 07:06 PM
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I agree with the others.
My old 325e e30 had this problem. Replacing the brake booster remedied it. But it had 350,000 miles on it so I'd check the vacuum supply to the booster before going straight for the booster.
__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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#9
05-03-2017, 08:02 PM
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Quote:
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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#10
05-03-2017, 10:08 PM
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Quote:
__________________
2001 X5 3.0i, 203k miles, AT, owned since 2014
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