Outer edge of rotor ground down (1 Viewer)

[reznunt]

I noticed a swirling, low-pitched, rotational scraping sound while driving down the highway at speeds where the wind noise was low enough to notice the sound. The sound had lessened to a whisper by the time I got home about 100 miles later, and only when turning left at near full lock. The remaining sound might not even be related to the original sound since it only occurs while turning. Upon inspection, I found this:

Dust shield still looks fine. So I took the caliper off to look for stuck debris but found nothing. Looked on the floor for a ground down rock or something similar but found nothing.

Checked clearance between caliper and rotor and saw daylight on both sides:

Any guesses on what it could be? I'm thinking it was stuck debris that ground down and fell out on the way home and now I'm chasing a different sound that I found while listening for the original scraping sound.

 

[nissanh]

It's the missing brake pad release spring. It probably dislodged and was rubbing on the rotor before falling off the caliper.

 

[GerLC100]

No idea what I could be, but you could perhaps use a sharpie to mark/ color that side, rotate and see if the sharpie is still there. If yes: might have been debris and all good. If not: problem still existing.

 

[TheForger]

It's the missing brake pad release spring. It probably dislodged and was rubbing on the rotor before falling off the caliper.

I think this is your answer. I don't see it in your pictures

 

[reznunt]

It's the missing brake pad release spring. It probably dislodged and was rubbing on the rotor before falling off the caliper.

I think this is your answer. I don't see it in your pictures

View attachment 3551321

Never had that W spring... either the 98 FSM doesnt call for it or I have aftermarket pads in there and the spring didnt fit. I cant remember which. That's why the holes in the pads where the springs hook into are covered in brake dust.

 

[hoser]

I don't know if it is the same problem but the wear pattern is similar.

Brake Problems-- Stuck Caliper Pistons?

My daughter and SIL have a new-to-them 99 100 series-- one that I found for them down here in AZ. They were out driving around Utah (Hobble Creek Canyon to be precise) and started to hear some noises coming from the driver's side front brake. So I am now trying to help them out from 600 miles...

forum.ih8mud.com

 

[reznunt]

I don't know if it is the same problem but the wear pattern is similar.

Brake Problems-- Stuck Caliper Pistons?

My daughter and SIL have a new-to-them 99 100 series-- one that I found for them down here in AZ. They were out driving around Utah (Hobble Creek Canyon to be precise) and started to hear some noises coming from the driver's side front brake. So I am now trying to help them out from 600 miles...

forum.ih8mud.com

The wear pattern on the rotor is the same. Interesting, thanks! My caliper doesn't look like it has the same grind marks as the OP in that thread. I did install new OEM bearings 38k mi ago with the proper preload. I'll check for play once the weather lets up.