Yes,the brake fluid level will increase when you change the pads. It is the fluid that was in the caliper that got displaced by the caliper piston when you retracted it to fit the new, thicker pads in.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record