Just a guess, but maybe you have good OEM pads up front and some cheap pads in the rear that have a lower coefficient of friction and thus less braking? What car do you have?

I didn't know they they checked these things at inspection.

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Ali Al-Chalabi

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