95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

‘01 4Runner trying to kill me.

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Old Oct 8, 2019 | 08:30 AM
  #1  
millertalbot's Avatar
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From: Angel Fire, NM
‘01 4Runner trying to kill me.

First, I know someone will tell me there’s a thread about this, I’m aware this is true but I can’t find it so I would love someone to point the way. I’m a stupid noob so there’s that...

Occasionally I’ll be in a slight curve on dry pavement and the slip indicator light will come on and the beeper will beep. Even less common, but increasingly so, it will apply the brakes such that I am pulled into the curve more steeply. This has pulled me into the other lane or off the shoulder. You can see how this might be alarming.

I’m asking for advice on how to resolve this issue. In my searches online, I’ve seen one other person has had this problem but have not found how to solve it.

Help, please!
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Old Oct 8, 2019 | 08:25 PM
  #2  
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From: Frederick, MD
I can’t speak for the slide control you’re referencing, which I believe is your VSC or TRAC system, as I’ve never experienced one malfunctioning.

As far as the brakes and a hard pull, I would say one side or the other is sticking and preventing that caliper/cylinder from working. Let’s say it’s in the front, if you had a stuck pad on one of the slide pins and you hit the brakes, that side would provide zero braking while the other side did all of it causing a pull. An intermittent pull is tougher to diagnose, but I would start with cleaning everything. Wire wheel the pins, bolts, and flanges. Then apply brake hardware lube in all the appropriate places and give it a go. It could be internal stiction in the piston bore which is harder to resolve under the shadetree and would probably be easiest to just replace that caliper.
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Old Oct 8, 2019 | 09:32 PM
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From: Alaska
Originally Posted by millertalbot
First, I know someone will tell me there’s a thread about this, I’m aware this is true but I can’t find it so I would love someone to point the way. I’m a stupid noob so there’s that...

Occasionally I’ll be in a slight curve on dry pavement and the slip indicator light will come on and the beeper will beep. Even less common, but increasingly so, it will apply the brakes such that I am pulled into the curve more steeply. This has pulled me into the other lane or off the shoulder. You can see how this might be alarming.

I’m asking for advice on how to resolve this issue. In my searches online, I’ve seen one other person has had this problem but have not found how to solve it.

Help, please!
I'm not familiar with your traction control system, but do you have a pull to one side when you hit your brake pedal? can you let go of the steering wheel on a straight and level road and hit the brakes without ending up in the ditch?
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Old Oct 9, 2019 | 03:56 AM
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From: Angel Fire, NM
The slip indicator light is the light on the dashboard and that’s what the manual calls it. I’m sure it’s the VSC system kicking in. It’s not a problem with the brakes because this happens and I’m not touching the brakes.

thank you for your response.
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Old Oct 9, 2019 | 03:59 AM
  #5  
millertalbot's Avatar
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From: Angel Fire, NM
Yeah, my brakes are fine, I can hit the brakes and there is no pull one way or the other. I’m sure it’s the Vehicle Skid Control system (VSC) that’s malfunctioning.

thank you for responding!
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Old Oct 9, 2019 | 05:15 AM
  #6  
aowRS's Avatar
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From: Ellicott City, MD
Miller,
It’s the VSC system trying to bring the truck under control. The system uses yaw sensors to determine pitch/roll/whatever and then pulses the wheel(s) that will help to avoid disaster. This is typically accompanied by an abrupt throttle change as well. I’ve never looked into it, but there is a way to recalibrate the VSC.

I’ve had this happen dozens of times over the years when making hard right turns at irresponsible speeds.

While the system can be frustrating in dry situations, it’s definitely kept me from eating curbs in the rain.



Andreas
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Old Oct 9, 2019 | 05:20 AM
  #7  
millertalbot's Avatar
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From: Angel Fire, NM
Thanks, this is happening at legal highway speeds though and it’s only just started happening. I think I have to call a dealer and talk to the shop...

thank you for responding!
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Old Oct 27, 2019 | 03:19 PM
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Any chance it's the brake ABS motor?
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