Active Handling / EBCM issue?
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
Active Handling / EBCM issue?
I've noticed since a June HPDE that when I accelerate out of a corner, I get the !brake light coming on. If I just corner hard, it doesn't happen. I've also seen it in just pure acceleration in a straight line from a stop. Happens in Comp mode or with everything turned on; have not tested with system all off.
Is this EBCM rebuild time?? What happens when you need one of those?
For sure, this was not happening in the 2+ years I had the car before June.
Edit: Just checked, there are no codes. I did but some old brake pads on after I got back in June, the rears only have a little meat left. Would that cause a problem?
Thanks for any opinions!!
Is this EBCM rebuild time?? What happens when you need one of those?
For sure, this was not happening in the 2+ years I had the car before June.
Edit: Just checked, there are no codes. I did but some old brake pads on after I got back in June, the rears only have a little meat left. Would that cause a problem?
Thanks for any opinions!!
Last edited by sothpaw2; Aug 30, 2009 at 10:49 PM.
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
...only a thought..
I would turn off both the T/C & Active Handling assists, simulate the action you described, and see if it still exists. It sounds like your Active handling is trying to engage and the current brake pads may not be sufficient for it to provide the necessary handling corrections...also check front wheel sensors and related connections.... that also could be the source..
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
I would turn off both the T/C & Active Handling assists, simulate the action you described, and see if it still exists. It sounds like your Active handling is trying to engage and the current brake pads may not be sufficient for it to provide the necessary handling corrections...also check front wheel sensors and related connections.... that also could be the source..
What would I check on the connnections--mechanical intergity or can I only find issues w/ a resistence or current draw check?
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
I would turn off both the T/C & Active Handling assists, simulate the action you described, and see if it still exists. It sounds like your Active handling is trying to engage and the current brake pads may not be sufficient for it to provide the necessary handling corrections...also check front wheel sensors and related connections.... that also could be the source..
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Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
Can anyone tell me if I'm not using brakes and the AH is off (all TC off) why the brakes would even be involved cornering? I tried this again this morning and got the !brake light in the 2 corners I tried. The light comes on at when I'm at peak g's or just after. I'll have to double check but I don't think I've ever seen it when I'm actually on the brakes.
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
I'll try adding fluid to reservoir but it really is not low.
Is there an accelerometer that would set off the brake light even if braking and AH are not active??
Advanced
Joined: Jul 2009
Posts: 51
Likes: 0
From: Smyrna Tennessee
in my zo6 it always says active handling across the bottom of the instrument cluster when it is being obtrusive. I would top the brake fluid up before i got into a long drawn out diagnostic. On other cars i have worked on they will turn the light on while cornering even before it gets half low on fluid in the master cylinder.
Advanced
Joined: Jul 2009
Posts: 51
Likes: 0
From: Smyrna Tennessee
one other thing you might try is unplugging the sensor on the master cylinder and see if the light on the dash comes on. if so put a paper clip (jumper wire) across the terminals and go for a spirited test drive and see if the light is out.. if so you know it is fluid sensor related. if not you know to go elsewhere.
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
one other thing you might try is unplugging the sensor on the master cylinder and see if the light on the dash comes on. if so put a paper clip (jumper wire) across the terminals and go for a spirited test drive and see if the light is out.. if so you know it is fluid sensor related. if not you know to go elsewhere.
Melting Slicks
Joined: Aug 2003
Posts: 2,233
Likes: 2,158
From: Cary NC
When my brake light appeared (only under acceleration), the problem was that the fluid was slightly low in the master cylinder. The fluid was not below the "MIN" line, but was close to it.
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Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
BTW--that was it--just really have to go near the max line when you fill the master. :o
