The mystery item was part of the filler cap. Either it had fallen off a long time ago, or when you broke the cap, it was collateral damage.
From your description of all of the sludge in the brake...
Type: Posts; User: LarrBeard
The mystery item was part of the filler cap. Either it had fallen off a long time ago, or when you broke the cap, it was collateral damage.
From your description of all of the sludge in the brake...
You will get new rubber parts in your master and wheel cylinder rebuild kits. Don't try to reuse any rubber parts - the old rubber is beyond its "use-by" date.
I second GMWillys' advice about...