2007 Tacoma DCSB 4x4 Brake Pulsating

Hello everyone, I know there has been a lot of threads going around on this topic, however too much to read through.

My issue is a pulsating brake pedal that you feel almost like a clicking in the pedal. Feels more electronic than pads, rotors, alignment, tires, or unevenly torques wheels. It does not occur all the time and only happens the last few feet approx 20-30ft before a complete stop.

Has anyone had this particular issue? Brake booster? M/C? ABS module?

Do you think bleeding the master cylinder w tool to ope valves may work?

Please let me know!

Thanks.

 

Sounds like the ABS may be kicking in when it's not supposed to, usually that is caused by a speed sensor that's dropping out at low speeds. Easiest way to determine which one it is is with a scan tool that can graph ABS data and looking for the one that's reading different from the others.

 

Erratic ABS activation at low speeds (like parking lot speeds) is often caused by a cracked/chipped tone ring

Scan it for abs codes.. or graph the wheel speed sensors and go for a drive. Look for a signal that drops out or is way different from the other 3

The tone rings and sensors are built into the front wheel bearings. If the bearing is loose the ring will dance around in front of the magnetic pickup and cause it to send a dirty signal to the control module. Check the bearings for looseness

 

Okay, so I just realized the problem occurs at the same exit where I hit a small bump on the road before making a complete stop. It does it in other areas as well.

So what happens is during the gradual slowing while applying the brake and before coming to a complete stop I hit this small bump and then get the pulsating in the pedal. Like I said it does not feel like rotors, pads or wheels. You can almost hear an electronic clicking and feel it in the pedal.

any thoughts on this?

 

I still think your ABS is activating when it's not supposed to most likely due to a sensor dropping out, a scanner that can graph ABS data could confirm and like @b_r_o said it could be a problem with a tone ring or wheel bearing and not necessarily a bad sensor.

 

It's probably the ABS like we've been saying. When the wheel hits that bump it might jar something at the sensor and make that wheel read a different speed for a quick second. The abs system thinks that wheel is locking up so it engages to prevent wheel lock up at that corner

Next time it happens look down at the dash and see if the traction control light is coming on.

Take it to a toyota mechanic and see if the steering angle needs to be re-calibrated (or whatever yaw sensor needs to be re-centered from time to time, like after a lift)

 

Thanks guys! Really appreciate your guys input. Will have it looked into at the dealer when I get a chance

 

Why can't you just simply jack up the front and pull the tires to inspect the pads and rotors before taking it in for repair? Brakes and rotors do have a life span like any other wear items.