I rebuilt my front calipers approximately 18 months ago. Thought I had cleaned and polished pistons, bores and seal grooves sufficiently before reassembly.
Last week the car started pulling under braking and have now found a leaky seal at one of the small pistons.
When I removed the caliper I found hat corrosion in that piston seal groove apparently left impressions (similar to pin holes) in the upper and outer seal surfaces.
I cleaned up the groove with circular Dremel hard and soft disks. I guess dreaming that would work with the groove clean I reinstalled that seal and reassembled but it didn't seal.
Does anyone know the dimension of the seals so that I may search for a single seal rather than purchase a complete kit again. I suppose I could find a dial caliper and measure but thought maybe someone had that information available and the size was available as common seals through hydraulic parts.
I know it's a good possibility and best to again rebuild the fronts and purchase new kits but wanted to avoid that until necessary.
Thanks in advance for any suggestions and help,