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While driving front passenger brakes engaged on their own

Tiny
TOYPACIFIC
  • MEMBER
  • 2008 TOYOTA RAV4
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 156,000 MILES
Hi, I have a question last week my neighbor had accidentally hit my drivers side bumper and caused a very minor dent closer to the door. Anyways, car ran fine prior to this, but after that day I drove it off and going down the road the car front passenger side just braked on its own. Like the pads were engaging and a beep sound also went on as well as the dash light with the vehicle skid light.
so I can drive it a few 20 feet then its like the brakes on the passenger front just engages. Its funny the accident didn't seem that bad actually very minor. But then this started happening, I did take off the tires on a jack stand but couldn't point out the problem maybe you might have some ideas as to what you think might have happened.
unfortunately, we did call the cops for a report so I could have claimed insurance but my neighbor didn't have drivers license or what not and because of this pandemic I canceled out in good faith, but it seems now i'm stuck with this issue that I got to fix on my own. Which I don't mind but need some guidance as to where to start. I appreciate you help very much.

Thank you
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Sunday, August 2nd, 2020 AT 4:39 AM

18 Replies

Tiny
ASEMASTER6371
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Good morning,

Is the ABS light on? If it is, do you know the code?

https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide

As far as the wheel, it sounds like either the caliper or the brake hose may be the issue.

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

When the wheel is tight, remove the wheel from the car and open the bleeder for the caliper and see if fluid shoots out and the wheel loosens up and turns free.

https://www.2carpros.com/articles/brake-caliper-replacement

That will confirm either the caliper or the brake hose.

Roy
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Sunday, August 2nd, 2020 AT 6:09 AM
Tiny
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This was the light that went on when ever it happened. I will check on the caliber and bleed it also the lines. Thank you for your response. By the way the indication seen on the image would that better explain what's happening?
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Sunday, August 2nd, 2020 AT 7:29 AM
Tiny
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That is for skid control. It is part of the ABS system.

Keep me updated.

Roy
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Sunday, August 2nd, 2020 AT 7:32 AM
Tiny
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Okay, I see. Thank you for the information.
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Sunday, August 2nd, 2020 AT 5:26 PM
Tiny
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You are welcome.

Always glad to help.

Roy
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Sunday, August 2nd, 2020 AT 5:38 PM
Tiny
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  • 159 POSTS
  • 2008 TOYOTA RAV4
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 158,000 MILES
So I just changed out a new brake caliper on the front right side. As I said before the brakes were engaging while driving only on the front right. And the skid light on dash goes on with a beeping sound as well. After changing to new caliper I'm still getting the same problem. I need some more advice please.
Thank you.
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Tuesday, August 18th, 2020 AT 10:54 AM (Merged)
Tiny
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Hello I'm Tom,

First if the caliper was hanging up you would have two things going on. One, the tires rim would be blazing hot to hot to touch and when you hit the brakes the car would pull to that side. From the video it doesn't look to me like the car is pulling when you apply the brakes. Is that true? Also am I hearing the computer anti-lock brake motor engage besides the beeping sound? I think you have an issue with the anti-lock system.
Let me know if in fact I'm hearing the electric brake pump.
Tom
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Tuesday, August 18th, 2020 AT 10:54 AM (Merged)
Tiny
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I did not brake at all while driving and then it locks up on the right side. It doesn't pull to the right when I brake so that's one out of in the clear. But yes the beeping sound goes on but no ABS light just the skid light goes on. Then it will release again and drive then do it again down the road..
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Tuesday, August 18th, 2020 AT 10:54 AM (Merged)
Tiny
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I actually took out the ABS fuse and car drives fine now.

Now I need to fix this ABS problem.
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Tuesday, August 18th, 2020 AT 10:54 AM (Merged)
Tiny
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So the car isn't pulling at all is the brake anti-lock pump turning on though? Yes, that makes sense, you issue is in the anti lock system. It's getting late but I will put together for you all the anti lock system info for you in the morning.
Tom
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Tuesday, August 18th, 2020 AT 10:54 AM (Merged)
Tiny
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Hello,

Sorry for the delay so Ive uploaded the basic system that involved I think you should have CAN system scanned and see if anything comes but since this all started with a fender bender it looks like the speed control sensors are easily damaged. You should do a good inspection as well near the dent, look for wires that could have been compromised but here is what to check out according to the data
BRAKE CONTROL: SKID CONTROL SENSOR (for 2WD): INSPECTION
INSPECTION
1. INSPECT SKID CONTROL SENSOR
(a)Check the speed sensor. If any of the following occurs, replace the speed sensor with a new one.
- The surface of the speed sensor is cracked, dented, or chipped.
- The speed sensor has been dropped.
2. INSPECT SKID CONTROL SENSOR WIRE
(a)Check the sensor wire. If any of the following occurs, replace the sensor wire with a new one. The connector or wire harness is scratched, cracked, or damaged.

I'm thinking the system is getting bad data and making the anti skid circuit engage from the little bump it got. Scanning the CAN will let us know maybe. Probably a wheel speed sensor. Interesting that the left side was hit but the right side is engaging. We need to make sure the modules are communicating with each other correctly. The fact that dropping a sensor can cause it to fail leads me to believe it's going to be one of them tell the computer that a tire is turning at a different rate.
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Tuesday, August 18th, 2020 AT 9:40 PM
Tiny
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No worries on the delay, man honestly I looked into it and it could possibly be the speed sensor which I didn't think of in the beginning. Anyways car does not belong to me but to a family member. I got them driving it regularly now without the ABS. But I did advice them to return sometime next week for me to check on those sensors. Our governor has placed us on lock down again so no social distancing or going places unless essential. So I guess we got to wait until they lift up these guidelines again. But I really appreciate your response and information. And yes it didn't make sense at first why it got hit on the left but the right side was the one locking. I guess even on side could throw off the other or maybe the module itself got thrown off. Anyways thank you again and I will be back again if need so. Stay safe and god bless you brother.

Sincerely,

Toypacific
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Tuesday, August 18th, 2020 AT 10:10 PM
Tiny
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Did you have the codes checked for the ABS system? There is a fault code stored in the system for the light and that will help us narrow the area of failure.

https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide

As far as the pulling, that most likely has nothing to do with the light. That is basic hydraulics. You changed the caliper but the more common reason for the pulling is the brake hose that collapses and does not release the caliper. After you stopped in the video and then moved forward, the caliper was still applied.

I would replace the brake hose and flush the brake fluid system with new fluid.

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

Roy

BRAKE: FRONT BRAKE FLEXIBLE HOSE: REMOVAL

REMOVAL
HINT:
Use the same procedures for the LH side and RH side.
The procedures listed below are for the LH side.

1. REMOVE FRONT WHEEL
2. DRAIN BRAKE FLUID
NOTE: Wash off brake fluid immediately if it comes in contact with any painted surface.

3. REMOVE FRONT FLEXIBLE HOSE

imageOpen In New TabZoom/Print

(a)Disconnect the brake tube (labeled A) from the flexible hose with SST while holding the flexible hose with a wrench.
SST: 09023-00101
Do not bend or damage the brake tube.
Do not allow any foreign matter such as dirt and dust to enter the brake tube from the connecting point.

(b)Remove the clip (labeled B).
(c)Remove the 2 bolts (labeled C, D) and then remove the flexible hose clamp (labeled E) from the knuckle.

imageOpen In New TabZoom/Print

(d)Remove the sensor clamp and flexible hose clamp from the flexible hose bracket.

imageOpen In New TabZoom/Print

(e)Remove the union bolt and gasket(s), and then remove the flexible hose from the disc brake cylinder.
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Wednesday, August 19th, 2020 AT 4:14 AM
Tiny
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  • 159 POSTS
Thanks, I'll go ahead and replace the hoses. On the other hand I was unable, unfortunately to get a code. I need to upgrade my obd2 because apparently mine cant pick up on ABS. So no codes as for now but I will order one with. I'll also probably replace the speed sensors to see if that might clear the ABS and function back normally. I appreciate your assistance and all the information you provided. I'll be sure to come back and look at your instructions provided if need to do so.
Thank you again.
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Wednesday, August 19th, 2020 AT 5:13 AM
Tiny
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You are welcome.

You can go to a parts store and have them read the codes for free. Then we can track the ABS system.

Roy
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Wednesday, August 19th, 2020 AT 5:17 AM
Tiny
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Did you respond? I got an email but nothing came through.

Roy
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Wednesday, August 19th, 2020 AT 5:29 AM
Tiny
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Yes, all good. Thank you.
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Wednesday, August 19th, 2020 AT 5:37 PM

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