Probably want to look at the master cylinder,and flush the lines before you install new cylinders. That crud comes from somewhere, and will not do well with the new parts.
Something about that STOPPING thing.

1954 Chevy Half-Ton
In the Stovebolt Gallery
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1958 Chevy 1/2-Ton Stepside
In the Stovebolt Gallery
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"Time's fun when you're having flies." ~~ OLD FROG