STEP BORE WHEEL CYLINDER

Straight bore double Ended (double) piston  )   

       or single ended (single Piston) In-spite of this  wheel cylinder , step bore double ended type wheel cylinder   On the some specific Vehicle can use  in this type of wheel cylinder  in half cylinder bore Diameter remains  more and half cylinder diameter styas less  that's why inside of one wheel cylinder  stays one big piston and inside of other  wheel cylinder syays small piston  

thetefore parimary brake shue found more braking  pressur  and  of secondry    brake shue found less braking pressur