a shudder
Thread Starter
Instructor
Joined: Dec 2004
Posts: 235
Likes: 0
From: Auckland
a shudder
Hi guys, sometimes when i apply my brakes i feel a slight shudder in the brake pedal then active handling comes up on the dic. Im not stomping on the brakes and road conditions were dry.
any ideas?
any ideas?
Thread Starter
Instructor
Joined: Dec 2004
Posts: 235
Likes: 0
From: Auckland
the brakes were not applied hard enough for the abs to work, and the road was not slippery. its deffinatlely out of character
standard size tyres on the front and 295 35 18 on the back, had them on for 18 months, problem started about 2 weeks ago.
standard size tyres on the front and 295 35 18 on the back, had them on for 18 months, problem started about 2 weeks ago.
Last edited by wettvette; Aug 11, 2008 at 04:06 PM. Reason: ?
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
It sounds to me like one of the sensors used by the Active Handling system is getting flakey.
Have you checked to see if any DTC are set ???
If, for example, as you brake the Steering Wheel Position Sensor (SWPS) erroneously tells the car that you turned the steering wheel (even though you didn't) the AH will try to turn the car in the direction the SWPS says you turned the wheel.
The other sensors used by the AH system are a yaw sensor, a lateral accelerometer, and the wheel speed sensors.
You can most likely eliminate the whell speed sensors as they are also used by the ABS and Traction Control systems .... so if those sensors were failing all 3 systems would have problems.
Again, check the DTC and let's see if the EBCM has spotted a problem yet ..... then we'll go from there.
Safety Car
Joined: May 2006
Posts: 3,799
Likes: 1
From: Northern Virginia
St. Jude Donor '08
Did it feel like the car was being pulled to one side as the brake pedal shuddered ????
It sounds to me like one of the sensors used by the Active Handling system is getting flakey.
Have you checked to see if any DTC are set ???
If, for example, as you brake the Steering Wheel Position Sensor (SWPS) erroneously tells the car that you turned the steering wheel (even though you didn't) the AH will try to turn the car in the direction the SWPS says you turned the wheel.
The other sensors used by the AH system are a yaw sensor, a lateral accelerometer, and the wheel speed sensors.
You can most likely eliminate the whell speed sensors as they are also used by the ABS and Traction Control systems .... so if those sensors were failing all 3 systems would have problems.
Again, check the DTC and let's see if the EBCM has spotted a problem yet ..... then we'll go from there.
It sounds to me like one of the sensors used by the Active Handling system is getting flakey.
Have you checked to see if any DTC are set ???
If, for example, as you brake the Steering Wheel Position Sensor (SWPS) erroneously tells the car that you turned the steering wheel (even though you didn't) the AH will try to turn the car in the direction the SWPS says you turned the wheel.
The other sensors used by the AH system are a yaw sensor, a lateral accelerometer, and the wheel speed sensors.
You can most likely eliminate the whell speed sensors as they are also used by the ABS and Traction Control systems .... so if those sensors were failing all 3 systems would have problems.
Again, check the DTC and let's see if the EBCM has spotted a problem yet ..... then we'll go from there.
Definitely a good idea to check for codes.
Le Mans Master
Joined: May 2006
Posts: 7,819
Likes: 220
From: Hillsboro OR
Did it feel like the car was being pulled to one side as the brake pedal shuddered ????
It sounds to me like one of the sensors used by the Active Handling system is getting flakey.
Have you checked to see if any DTC are set ???
If, for example, as you brake the Steering Wheel Position Sensor (SWPS) erroneously tells the car that you turned the steering wheel (even though you didn't) the AH will try to turn the car in the direction the SWPS says you turned the wheel.
The other sensors used by the AH system are a yaw sensor, a lateral accelerometer, and the wheel speed sensors.
You can most likely eliminate the whell speed sensors as they are also used by the ABS and Traction Control systems .... so if those sensors were failing all 3 systems would have problems.
Again, check the DTC and let's see if the EBCM has spotted a problem yet ..... then we'll go from there.
It sounds to me like one of the sensors used by the Active Handling system is getting flakey.
Have you checked to see if any DTC are set ???
If, for example, as you brake the Steering Wheel Position Sensor (SWPS) erroneously tells the car that you turned the steering wheel (even though you didn't) the AH will try to turn the car in the direction the SWPS says you turned the wheel.
The other sensors used by the AH system are a yaw sensor, a lateral accelerometer, and the wheel speed sensors.
You can most likely eliminate the whell speed sensors as they are also used by the ABS and Traction Control systems .... so if those sensors were failing all 3 systems would have problems.
Again, check the DTC and let's see if the EBCM has spotted a problem yet ..... then we'll go from there.
This is great advice. My car is doing the same thing. The codes I am getting are C1287 and C1288. In my case it is the SWPS causing it. ABS and AH apply the brakes at different rates. When ABS applies the brakes it will feel like the brake pedal is being pumped. When AH is applied the pedal will feel like it attached to a vibrator. AH applies the brakes at twice the frequency that ABS does.
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