What Are These On My Caliper Pistons?

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637
I got a rebuilt caliper for my 98 Expedition today from AZ. This is the first I have seen these plates clipped into the pistons on Expedition calipers. I removed them, but not sure why they were there in the first place. Any ideas and are they important? I am thinking they may just be a decoration to hide the pits in the face of the reused piston during the rebuild and make them look more like new. [Linked Image]
 
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My guess is they're supposed to act like a backing plate to deter squeaking. How many new threads are we going to get about this brake job?
 
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Originally Posted by Trav
To hide the crappy looking used pistons.
That sums it up, and maybe quiet things down a bit.
 
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Originally Posted by Trav
To hide the crappy looking used pistons.
shocked2 Must have found those on the bottom of the Yangtze!
 
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637
Originally Posted by mk378
How many new threads are we going to get about this brake job?
Sorry, not sure about posting protocol. I am not happy to have had so many different questions about an otherwise pretty straight forward brake job either. I just thought different topic, different thread, regardless of job. I would have thought the people who have the knowledge to reply to the post would not be revisiting a previous post that they already made input to. If protocol is to make one post for a single job, regardless of the topic, then I will consolidate in the future. Thanks for bringing it to my attention
 
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Yeah, they are some crappy looking pistons. I hope the seal surfaces are better than the pad contact face. I would hope there are some decent standards for parts that are reused for caliper rebuilds. They are Duralast.
 
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My master cylinder emptied while changing a caliper. I actually put my hose in a container while taking my old caliper to the store for replacement and when I got back, it was pretty much empty. I plan to flush and bleed my 2 front calipers and lines anyways and was planning to flush the rear lines while I was at it. Since the master cylinder is empty, do I need to bleed the master cylinder independently first, or will it bleed itself while pushing fluid through the lines during a flush?
 
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They look like plastic which made me cringe, at first. But apparently they are a solution to some brake noise/vibration problems in some models.
 
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