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AP Racing 6 Pot (Sequentially Sized) Caliper

Stoptech Caliper


Subaru 4 Pot Kit


Brake Calipers

Pots, Pistons, and More...

Subaru, in an attempt to meet a targeted price point for the US, opted to give us two pot or two piston calipers for the front disc brakes. Elsewhere in the world, Subaru gave WRX owners four piston/pot front brakes. We also received single piston rear brakes while those WRX's in Japan and Britain were granted dual pistons.

A brake caliper squeezes a brake pad on either side of the rotor. A single piston caliper only has a single point on which the pad?and hence the rotor?where pressure is applied. A two-piston/pot caliper has two points where pressure is applied to the brake pad. A four-pot setup has four points?and a six pot has six.

The theory is "the more 'pots', the better". With more pressure points spread along the brake pad, the force can vary along its distance allowing for more precise control.

So, in theory, the more pots, the better the braking system "potential". Other factors come into play such as un-sprung weight of calipers and/or rotors, inadequate master cylinder, improper calibration of the pistons, brake pads, rotor size, etc.

In other words, just throwing big brakes on your ride doesn't guarantee improved acceleration/deceleration. However, tuned properly, you can tame your WRX's power better than you ever thought possible.









 
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