Originally Posted by colenzae
2002 RX AWD 160,000 miles
The brake has been pulsing during normal braking for a few thousand miles now. It was intermittent at first, now it's more regular. Feels like it's the front right wheel.
Anyone have any experience with this issue and know a fix??
You are not alone; I too have the exact same issue. Sadly my sordid tale below does not possess a solution. :-(
For those who may not understand what's going on, the ABS system is kicking in and pushes back on the brake pedal while your braking. But this is just for normal braking: dry ground, no emergency situation, basic stop, etc. Furthermore it's intermittent: various speeds, turning or not, etc.
That was my original post when I didn't understand the problem. I'm fairly certain now it's the ABS system that's creating the "chatter." Cleaning the front sensors didn't help and in the process broke a bolt which wasn't fun. :-(
With the weather warming I may try to clean the rear sensors, but I'm a little gun shy about breaking another bolt and I've only read one case in which cleaning the sensors solved the problem (GS400).
I will point out, for me, over time the problem has become more common. Initially it rarely happened, now it happens at least once a day. In some cases I can hear the ABS motor "spin up" (kindof like a whine) as if it's getting ready to engage and then engage (or not.) And this occurs when I'm just going leisurely down to my neighborhood stop sign <15mph.
Because of the slow progression of this problem, I think it may be the tires. Truthfully my tires are pretty well shot and I'm getting them replaced this week (Geolanders H/T.) I'm hopeful the issue goes away, but if not, I may bite the bullet and take it to the dealer. The pads/rotors are all new and I'll have new tires.
Here's a list of possible issues (please add others):
* broken tone ring aka reluctor ring (http://www.reluctorrings.com/lexus.php
* bad or dirty ABS sensor
* bad ABS module
* worn tires?
Here's a list of threads dealing with this problem. I searched "ABS Pulsating".
In the last thread, the author had this problem *twice* and got it fixed. I PM'ed him last week to find out what the problem was and haven't heard back.
I'll keep you posted.
2000 RX300 AWD 108k