The caliper mainly uses the piston to let the brake pad clamp the brake disc,Most ordinary cars use single piston,sports car/Performance cars will be upgraded to dual pistons for better braking performance. Above pistons are often called"abalone",A typical example is evolution and STD car department.The internal main components of the caliper can be divided into pistons(piston),Piston Oil Separator(Piston seal)and dustproof(Piston boot),As for the other rays that are too detailed, I won't mention them..,When plastic parts(seal)reach life cycle,hardening occurs/Insufficient sealing,If impurities are mixed into the interior, rust will occur.,In the long run, the piston will not function properly,The final blocking problem.
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