Hello everyone. I completely rebuilt my rear brakes and was attempting to bleed them today. When we opened the bleeder and started to press the brake, it seemed like the brake was a little tough to press and after trying for a while, we got no fluid to come out. The master cylinder was full and wouldn't go down in fluid level. So I'm assuming the brake lines that exit the master cylinder or the lines underneath the car are clogged. None of that has been replaced, only the rear brake assembly and the lines that come out of the "T." I should've known it was going to need to get replaced so I started to tear things down. Underneath the master cylinder, bolted to the inner fender, I see this piece. What is this? Also, not quite sure how to remove it. It seems like the bottom of it has one massive rivet or something like that but I doubt that's how to get it off. Any help would be appreciated, thanks guys!
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