Brakes locking up into a turn
Thread Starter
Drifting
Joined: Oct 2004
Posts: 1,921
Likes: 1
From: Torrance California
Brakes locking up into a turn
I've noticed it a few times now where when I going into a turn pretty hard and either slightly press brake pedal or really press it the brake pedal will pulse back and forth and no messages come on DIC. Not a comforting feeling when coming into a turn. Car feels like it doesn't want to go where I'm trying to point it. What could be causing this?
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,821
From: Charlotte, NC (formerly Endicott, NY)
It sounds like you are getting some ABS action on one or both front wheels which means the system is keeping the brakes from locking up. The tire has a certain amount of traction that can be used for braking and cornering. That close to lock up you are using most of the traction budget for braking and that will reduce the amount of turn in you can get and make the car go wide. ABS will allow you to steer while braking hard but it can't keep you from over using the tires.
Bill
Bill
Melting Slicks
Joined: Aug 2005
Posts: 3,398
Likes: 2
Turn it all off and feel how much better your car will go into turns at high speeds especially if for any reason you have to hit the brakes even softly in the turn. First thing I do after starting car is hit the button and turn it all off. I guarantee if you drive your car hard on the street into turns/curves and back road twisties you will love it all turned off.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Turn it all off and feel how much better your car will go into turns at high speeds especially if for any reason you have to hit the brakes even softly in the turn. First thing I do after starting car is hit the button and turn it all off. I guarantee if you drive your car hard on the street into turns/curves and back road twisties you will love it all turned off.
You have no idea what Z28Style23's experience or skill level is. he could be a young kid with a years driving under his belt or a NASCAR driver.
AH/ABS is fitted to this car for a reason. JMHO
with Bill. It could also be the rotors starting to wear abnormally although that would probably also be felt under straight line braking.
Melting Slicks
Joined: Dec 2003
Posts: 2,857
Likes: 2
From: pawleys island sc
Thats bad advice Brian
You have no idea what Z28Style23's experience or skill level is. he could be a young kid with a years driving under his belt or a NASCAR driver.
AH/ABS is fitted to this car for a reason. JMHO
with Bill. It could also be the rotors starting to wear abnormally although that would probably also be felt under straight line braking.
You have no idea what Z28Style23's experience or skill level is. he could be a young kid with a years driving under his belt or a NASCAR driver.
AH/ABS is fitted to this car for a reason. JMHO
with Bill. It could also be the rotors starting to wear abnormally although that would probably also be felt under straight line braking.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
Rear Stability Control
I've noticed it a few times now where when I going into a turn pretty hard and either slightly press brake pedal or really press it the brake pedal will pulse back and forth and no messages come on DIC. Not a comforting feeling when coming into a turn. Car feels like it doesn't want to go where I'm trying to point it. What could be causing this?
The description is as follows .....
When the vehicle performs a high speed turn or curve, the EBCM will enter Rear Stability Control Mode, The vehicle speed is greater than 30 MPH (48 KPH) and the vehicle lateral acceleration is greater than 0.6 g. The vehicle will exit stability control when the vehicle speed is less than 25 MPH (40 KPH) or the vehicle lateral acceleration is less than 0.4g.
During a rear stability control event, the EBCM performs a pressure increase on the outside rear brake and a pressure hold on the inside rear brake. The driver may hear the pump motor run and may feel a vibration in the brake pedal
$20.00 says you're experiencing Rear Stability Control Mode ...
Thread Starter
Drifting
Joined: Oct 2004
Posts: 1,921
Likes: 1
From: Torrance California
Yeah I know its not a rotor pulsation. It does feel more like ABS kicking in but I thought ABS would only kick in if i'm doin more of a panic stop. Thats not what i'm doin at all. Its just medium to light applying of the brake pedal that causes this and is very unsettling when your making the turn. And I rather not switch off the TC system but I think I will try the scenario in an open parking lot with the TC on and off to see if that is indeed what is going on. Thanks for the responses.
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Thread Starter
Drifting
Joined: Oct 2004
Posts: 1,921
Likes: 1
From: Torrance California
Starting with, I believe the 2001 Model Year, the EBCM has a function called "Rear Stability Control".
The description is as follows .....
When the vehicle performs a high speed turn or curve, the EBCM will enter Rear Stability Control Mode, The vehicle speed is greater than 30 MPH (48 KPH) and the vehicle lateral acceleration is greater than 0.6 g. The vehicle will exit stability control when the vehicle speed is less than 25 MPH (40 KPH) or the vehicle lateral acceleration is less than 0.4g.
During a rear stability control event, the EBCM performs a pressure increase on the outside rear brake and a pressure hold on the inside rear brake. The driver may hear the pump motor run and may feel a vibration in the brake pedal
$20.00 says you're experiencing Rear Stability Control Mode ...
The description is as follows .....
When the vehicle performs a high speed turn or curve, the EBCM will enter Rear Stability Control Mode, The vehicle speed is greater than 30 MPH (48 KPH) and the vehicle lateral acceleration is greater than 0.6 g. The vehicle will exit stability control when the vehicle speed is less than 25 MPH (40 KPH) or the vehicle lateral acceleration is less than 0.4g.
During a rear stability control event, the EBCM performs a pressure increase on the outside rear brake and a pressure hold on the inside rear brake. The driver may hear the pump motor run and may feel a vibration in the brake pedal
$20.00 says you're experiencing Rear Stability Control Mode ...
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
It only intervenes if you are braking in the corner, so if you don't brake, it won't intervene. 
I've never seen an option, even on a Tech2 scanner, to disable the function. It's kinda like the Dynamic Rear Proportioning function in the EBCM, it's just there.
Hope this helps,
Steve
I've never seen an option, even on a Tech2 scanner, to disable the function. It's kinda like the Dynamic Rear Proportioning function in the EBCM, it's just there.
Hope this helps,
Steve
Melting Slicks
Joined: Aug 2005
Posts: 3,398
Likes: 2
When most people can run several seconds faster lap times with it all turned off (even inexperienced drivers) its a no brainer for me what mode to run in.
Sorry guys, I just expect most guys to be able to drive a car themselves.
Sorry guys, I just expect most guys to be able to drive a car themselves.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
It's not AH that is causing his "problem" ... it's Rear Stability Control ... see post #7 above ...
Team Owner
Joined: May 2006
Posts: 21,473
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From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
This is like the 5th time I've gone into a turn braking a bit slightly into the turn and coming on it hard and hot and AH came on and just made me lose it as it crossed me up and I just about went off roading. My buddy said it saved me from losing it all the way worse when I braked going to fast and I'm like BS. We went back around and came back to same freeway exit curve cept this time I turned it all off, came into same curve even faster hitting brake even harder coming into front section and came out faster and he just looked at me and said damn, you don't need the dang computer do you. I said F the computer when driving like that, don't need it telling me how I'm suppose to be driving.
If you take an off ramp too fast and the AH kicks in because you brake into the turn, the last thing I'd try is to take out the automatics and try to take the curve even faster.
Ive had 34 years without an accident, driven the autobahns and have over 20 years in the cockpit flying fighter jets.
There are old pilots and bold pilots but there are no old bold pilots.
My brain hurts.
Last edited by DeeGee; Oct 28, 2007 at 05:51 PM.