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General E46 Forum
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Old 10-14-2011, 05:21 PM   #1
austindangers
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Air in brake lines causing DSC light?

Is it possible for air in the brake lines to cause the DSC light to come on?

At first I had the DSC, Brake, and ABS lights coming on but the car drove normal. Now, after a month or so (was putting off repairs since it didn't affect the driving) only the DSC light comes on but my brake pedal is real mushy.

I was just wondering (read: hoping) that air in the brakes lines could cause the faults, since maybe air was passing through the DSC manifold and throwing codes. I'm really hoping it's not the $1,900 DSC controller that's giving me the mushy brake.

Thoughts? Oh, it's a 2000 328i.
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Old 10-14-2011, 06:33 PM   #2
E46330iguy
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Sound like you need to bleed the brakes anyways ! Give that a shot
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Old 10-14-2011, 08:21 PM   #3
shata
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I have same problem on mine, Not sure whats causing it. Lemme know if you figure it out.
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Old 10-15-2011, 01:00 AM   #4
ZHPRegistry
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When the DSC comes on, do you also have BREAK light on? Generally if your brake fluid is low this is a typical manifestation.
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Old 10-15-2011, 11:48 AM   #5
shata
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Ya DSC, Brake and ABS are on sometimes but not everytime its odd.
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Old 10-15-2011, 06:11 PM   #6
austindangers
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My brake fluid is full. I used to get the "Brake" "DSC" and "ABS" lights, but now it's just the "DSC" light. My plan of action is to bleed the brakes first, see if that fixes anything, and if not I'll prepare myself mentally and fiscally to replace the DSC hydraulic control module.

I'll keep you updated.
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Old 10-15-2011, 06:30 PM   #7
shata
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Your crazy for thinking about actually replacing 1,900$ dsc module for traction. lol Screw that. No thanks - Im all about fixing my car but not for traction control module.
Ya keep us updated =)
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Old 11-01-2011, 08:05 PM   #8
austindangers
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In case this helps anybody else...

See my original post asking if air in the brake lines can cause the DSC light to come on.

The answer: yep, it sure can!

I just flushed my brake system this past weekend. The mushy pedal went away and the DSC light hasn't come back on since. I suppose the tired, worn out fluid was causing some issue with DSC braking authority, not allowing the DSC to apply as much braking power as it normally would.
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