Brembo calipers, seized bleed screws, galvanic corrosion.

My son bought a CPO 2014 Carrera S from the Porsche dealer in Chicago. We have been going through the car, performing all the services to establish a new service dateline. We were performing the brake flush today. Starting at the rear, some of the bleed screws were hard to break loose, but did release and we bled those calipers. Moving to the front, the right front bleed screws were frozen. Working carefully, we still broke one of the bleed screws. Throughout this process I was concerned that the bleed screws had not been "exercised" in a long time - despite the CPO certification. The fluid does look good though. We'll find a new caliper, but I am considering the following options on the 3 remains calipers:

1) Replace all the caliper bleed screws and maintain a 2 year flush cycle.

2) "Exercise" the remaining bleed screws and put the flush on a yearly schedule

3) Replace the damaged caliper and put the car on a short (3 month)t flush cycle

I am concerned that the brake flush schedule has not been maintained allowing galvanic corrosion to set in between the screws and the caliper. I am hoping to prevent the bleed screws for seizing/breaking in the future.

I replace my fluid every 2 years. If I were you I would also replace every 2 years.
If you are still concerned about future galvanic corrosion, you can always crack open the bleed screw every year or 6 months just to let some fluid out. This would avoid you doing options 2 and 3 and keep the bleed screw from freezing.[/size][/size]



Edited 2 time(s). Last edit at 06/08/2025 01:47AM by carlos in Montreal. (view changes)

Thanks Carlos. I actually am in the habit of flushing my Boxster yearly so I am always current for DE events. But this is my son's recent purchase and despite the CPO paperwork we do not know when it was done last. While the fluid we were able to flush at the rears looks good the bleeder issue concerns me.