Stumped on shudder while braking still...? - Toyota 4Runner Forum

judogti · 07-26-2021, 08:19 PM

Was wondering what else I should check/change, I am getting some decent shuddering, pulsing, shaking while braking at highway speeds.

I have replaced the front rotors, calipers and pads, rear pads, LCA's (full), shocks are in okay shape. Could it be some other bushings? Shocks?

The car is a 2009 Limited w/ 211,000 miles on it, I dont know what else to look at for replacement to stop the braking shudder.

y=mx+b · 07-26-2021, 08:44 PM

Did the shutter change after installing the new pads and rotors? Did you bed the pads properly? If the pads aren't bedded properly, then at a stop while holding the pads against the hot rotors from braking, they can leave a pad deposit and give a false warped rotor feel

When was the last time the tires were balanced and rotated?

AuSeeker · 07-26-2021, 09:34 PM

You didn't mention replacing the rear rotors or calipers, either or both could be the issue.

Syr4RinNC · 07-26-2021, 09:49 PM

It’s hard to directly compare experiences by words, but I always experience some significant vibration or feeling the brake clamps tightly, loosens then clamps, possibly like a shudder.

After I replace the pads and rotors, it helps a bit but comes back. Not sure if I always have warped rotors or what cause this for me, but I’ve just become accustomed to it.

hankd · 07-26-2021, 10:28 PM

Quote:

Originally Posted by AuSeeker

You didn't mention replacing the rear rotors or calipers, either or both could be the issue.

yup bad rear rotor or caliper can cause this and even make you think the problem is something up front

judogti · 07-26-2021, 10:57 PM

Quote:

Originally Posted by y=mx+b

Did the shutter change after installing the new pads and rotors? Did you bed the pads properly? If the pads aren't bedded properly, then at a stop while holding the pads against the hot rotors from braking, they can leave a pad deposit and give a false warped rotor feel

When was the last time the tires were balanced and rotated?

I only did the rear pads, and not the rotors, I can definitely give that a try.

I did properly bed the pads over a tank of gas, but the shudder before and after was pretty much the same.

I did get new tires about 2 months ago with a balance, and had an alignment when I did the LCA's.

I did have a seized caliper so I thought for sure it was that and when that didnt fix the issue, I thought it'd be the bushing on the LCA's.

I appreciate the input and questions.

Flesh Eater · 07-27-2021, 05:14 AM

If it still noticeable after the rears it could be the ABS. I can feel ABS when I rebuild my brakes on all my older vehicles.

notajetski · 07-27-2021, 05:41 PM

Did you change the rotors with the pads, at the same time? Or was there any significant mileage between replacing them?

It's possible that if they were _really_ warped, then the pads might have an unusual contact patch with the rotors, but unlikely. Probably rear brakes and rotors 😅

Other thoughts are maybe to rotate tires and see if that changes anything 🤷*♂️

judogti · 07-27-2021, 06:40 PM

Thanks, I'll swap the rear pads and rotors again and if not check the ABS and see if thats it

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