Brakes pulling in turns

<div class='quotetop'>QUOTE(GAGendel\";p=\"87499)</div>

Watch the speedometer carefully when this occurs. I believe you will find it occurs at 8 mph, the point where regenerative braking becomes ineffective and full hydraulic braking is metered by the brake controller. Some vehicles are more noticeable than others. There is simply not enough hydraulic braking metered into the system at the transition point. The system quickly gets back to the desired deceleration, which is noticed if you keep your foot in the same position. You get uniform decel until about 8 mph, a slight loss of decel, then your target decel returns. All in all, I find the brake system is much more linear than most even with this characteristic.

 

<div class='quotetop'>QUOTE(Sky\";p=\"90040)</div>

OK, now things are adding up. You have VSC and you have instances of counter steering on curvy roads. The Prius with VSC has steering assisted VSC. What this does is reduce assist in the direction the control algorithm determines is not the correct direction to steer out of a skid. Assist is boosted in the correct direction. The loss of assist may feel like the car steers itself as the sudden loss of boost will effectively stop the steering wheel motion in the direction opposed to assist. I sounds very much like you are getting VSC hits. This could be caused by several things, including a bad speed sensor or sensor tone wheel (tone wheels on the front axle shafts), a bad "gyro" sensor (the latitude and longitude sensor used for VSE in addition to the yaw sensor for ABS), or a computer problem causing either the skid ECU to request steering changes or the steer ECU incorrectly doing its job. Sounds like a job for the technician with a scan tool so they can monitor variables when the problem is recreated.

 

First, if VSC was kicking in, the squiggly car would blink, and a chime would be heard.

ABS would only have the squiggly car blink, no chime. Same for Traction control.

Second, the yaw sensor is strictly for VSC. The yaw sensor module also has a deceleration sensor. This module doesn't exist if you don't have VSC. ABS only uses individual wheel speed sensing.