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Looking at the brake pistons it was clear that I would benefit from fitting new ones. Remember that they are the same as Porsche 911 ones (47.97mm x 30 mm) and I bought four new ones and the required seal kit from a company called BiggRed - total cost around £120.
Fit the new hudraulic seals and pistons with a little brake fluid on the piston as you push it in. I also add some brake grease (red) around the piston as I finally push it down into the calliper housing.
Then fit new dust seals and spring clips - these can be a PITA to fit.
After rebuilding both front callipers with new stainless steel pistons and new seals I decided to also fit new discs bought from the BremboShop and of course new pads (same as Alfa Spider).
So I was out driving with the SuperCarDriver guys the other week in my Ferrari Dino 308 GT4 starting pulling to the right (drivers side UK) under braking. I've never really looked at the front brake callipers so I suspect it is time for a rebuild.
So I pulled the left hand calliper pads to take a look and sure enough one of the pistons was seized. So definitely time for a rebuild.
Next thing was to remove the calliper and remove the pistons. It's normal to use compressed air to pump the pistons out of a removed calliper - clamp the one you don't want to come out first.
You can see that there is no rust inside the cylinder area but you can see the rust on the thin section after the groove where the hydraulic seal goes. I used a dremel type drill to remove this surface rust - being careful not to mark the inner cylinder area. I also cleaned out the seal groove which showed some signs of rust.

Ferrari 250 GT California Spyder by Scaglietti and Ferrari 365 GTB/4 Daytona
