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When I go to car shows, there's always a few (or more) cars that look brand spankin' new under the hood. For example, alternator pulleys still have that "new" shine to them, master cylinders aren't surface-rusted, hoses/belts still look new.
How do they maintain the parts? Whenever I install a new part, it's only a matter of weeks/months before the finish begins to fade. My new brake booster & master cylinder are already rusty! My car is not a daily driver and lives in an enclosed garage.
Go To www.eastwood.com They've got everything under the sun to keep that car of yours looking like U just drove it off the showroom floor. They also have a support & tech dept. That can help U out with any questions U may have.
If you live in Manalapan or close to the beach especially on one of the strip islands along FLs east coast, the prevailing easterly wind & salt air is a major killer....it could be what eating your parts.
Regardless, no way a brake booster & master cyl should be rusty if you prepared it properly prior to installing it. I never install parts without prepping the prepainted surfaces, re-painting and sometimes even clear coating for extra protection and lustre.
Replacement parts especially rebuilts are usually painted with cheapest coatings available. If you want it to look good and stay that way, you need to prep the part & detail its with quality coatings.
My engine hasn't been touched in over 4 years, it looks exactly the same as it did back then: