PMB_Performance
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Hello deQuincey,
Here's some answers:
1. No. It is generally not needed. We don't go crazy blasting inside bleeder and fluid inlets because of the machined threads. A quick acid bath makes certain the journals are cleaned as well.
2. Compressed air. No, not extremely critical other than the fact that the caliper core must be free from any media! Here's a shot of a set of Porsche "Big Reds" off a race car. These were "Polymer Coated" by a well known rebuilder (spray painter) in the Pacific Northwest, Seattle to be exact. They left all of the metal shot media in the calipers!!! The aluminum pistons were trashed... the calipers were trashed.
3. Yes. It's the key to a proper rebuild. 99.9% of caliper failures are because of rust... INSIDE the bore. Once the calipers begin to rust and that rust is mixed with old fluid (again, inside the bore) they stick and fail.
4. Don't worry about it. We get this question a lot and, it just doesn't matter. They were meant to be plated. Take the old plating off and put the new plating on.
Here's some answers:
1. No. It is generally not needed. We don't go crazy blasting inside bleeder and fluid inlets because of the machined threads. A quick acid bath makes certain the journals are cleaned as well.
2. Compressed air. No, not extremely critical other than the fact that the caliper core must be free from any media! Here's a shot of a set of Porsche "Big Reds" off a race car. These were "Polymer Coated" by a well known rebuilder (spray painter) in the Pacific Northwest, Seattle to be exact. They left all of the metal shot media in the calipers!!! The aluminum pistons were trashed... the calipers were trashed.
3. Yes. It's the key to a proper rebuild. 99.9% of caliper failures are because of rust... INSIDE the bore. Once the calipers begin to rust and that rust is mixed with old fluid (again, inside the bore) they stick and fail.
4. Don't worry about it. We get this question a lot and, it just doesn't matter. They were meant to be plated. Take the old plating off and put the new plating on.