Rear brake wear indicator

[LBridges]

As funds allow I have been trying to baseline the LX I bought a few months back. In looking at the brakes, both front and rear the pads are OK, but the part of a shim kit that goes up against the caliper was not there when I took it all apart - both front and rear.

In the meantime I have ordered all the right parts to include new rotors, pads and shim kits. But while I wait for them to arrive I have one question I can't figure out from the various parts illustrations, threads I looked at here, etc.

How/where does the rear brake wear indicator mount? Asked as it is also something the person performing the last brake swap decided to delete.

In answering try to keep in mind I'm not the brightest bulb in the stack (or I probably wouldn't be asking this) so if you have a pic that would be the very best, if not any help is still most welcome. And if when I see the part and it should be painfully obvious, that's OK to point out too (but see my earlier "not the brightest bulb" comment).

 

[PADDO]

Replaced my rear brake pads the other day with ProACT 773s and Beck Arnley 084-1564 shim kit, there wasn't a squealer wear tab in the shim kit, nor one on the pads - no rear wear indicator for me! The front pads (ProACT 772) and shims (Beck Arnley 084-1563) are still in the bench, the pads have a wear tab riveted to each backer plate and no wear tab in the shim kit.
Maybe rear wear tabs, if they are a thing for us, are only provided with the pads that come in a Toyota box?
HTH
Edit: iirc the original fitted rear pads did have a wear tab riveted to the pad. I replaced my original factory rears at around 60k miles - the squeal tab did its thing - and that was 7 or 8 years ago. I've since put another 90k on the pads that replaced the originals (they still had plenty of meat left too) and now I've just installed the second set at 152k. Not sure why people say these vehicles chew through rear pads.

 

[badlander]

The wear indicators are not included with the OEM pad sets. I took pictures when I took mine apart so I wouldn't mess it up. The first picture shows how it was clipped on to the pad. Note the orientation and relation to the anti-squeal shim. The other pictures shows how the clips go in the rear bracket. The upper and lower clips are different and not interchangeable. According the pic in the the FSM the wear indicator goes on the bottom of the outer pads. None are shown on the front pads. I suspect none are used on the front pad because they are very easy to inspect with the wheels removed. The rears, on the other hand are very hard to see even WITH the wheels removed.
I would suggest ordering new sliding pins and rubber seals as well when doing the rears. They are cheap and get rusted easily if the seals leak. Better to have them on hand, if needed, while it's all apart.

 

[PADDO]

Are you sure those are wear indicators? The pads I just removed had them, the rear shim kit I purchased included them, I thought they were an anti rattle clip, couldn't see how they would contact the rotor as nothing protrudes onto the pad/contact side. I may well be wrong though, I installed them in any case.
Pro ACT front pads have a wear indicator riveted to the backer plates.

 

[LBridges]

...
I would suggest ordering new sliding pins and rubber seals as well when doing the rears. They are cheap and get rusted easily if the seals leak. Better to have them on hand, if needed, while it's all apart.

Many thanks for the pics. Given what I found, broken retaining pin in front caliper, missing parts of the shim kits, etc., I'm going back and doing a total brake overhaul of the calipers (along with some new lines and rotors). That's the only way I, as a newbie to the 100 series, can get enough confidence to drive the Mrs., kids and grandkids around. An engine breaking down is an inconvenience, but brakes breaking....

Are you sure those are wear indicators? The pads I just removed had them, the rear shim kit I purchased included them, I thought they were an anti rattle clip, couldn't see how they would contact the rotor as nothing protrudes onto the pad/contact side...

I saw them on the parts illustration at Lexus of South Atlanta referenced as, "47771A PLATE, PAD WEAR INDICATOR (FOR REAR DISC BRAKE)". I have been driving for a few years now (48 with a license, but grew up on a farm so I started even earlier) and generally never found a need for wear indicators as I typically try to error on the caution side for replacing brakes and tires. But not knowing the 100, I wasn't sure what "should" be a baseline item.

 

[badlander]

If you do your own tire rotations just inspect the pads then, or any time you have the tires off. Pad wear seems to be very slow, at least on my 100 with OEM pads, so you will have plenty of time to order pads and parts ahead of time and you can plan your time to do the maintenance. I measure the front pads with a caliper and record the results in my preventive maintenance log (AutoVIP, free download) at each tire rotation so I can actually calculate at what mileage the pads will need to be replaced. It just gives me peace of mind knowing what is going on down there. The rears, like I said are a little harder to see and you can't measure them but they do have the wear indicators on them.
Here is an example entry into my PM log for front brake inspection:

"Checked passenger and driver side pads.

Driver Side
Inside: ..210 Wear since last check (5,368 Miles) = .015
Outside: .140 Wear since last check (5,368 Miles) = .023

Pass. Side
Inside: .245 Wear since last check (5,368 Miles) = .014
Outside: .170 Wear since last check (5,368 Miles) = .020


Heaviest Wear per Mile = .0000042/Mi.
Approx. remainimg miles for driver side outer pad to reach .100 thickness = 9,524 Miles.
Estimated mileage for pad replacement = 165,238"