Wheel cylinders are capable of delivering what kind of force when compared to calipers?

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The key idea is how hydraulic force is created at the braking surface. The force a brake can apply to its surface is the hydraulic pressure times the piston area. Calipers in disc brakes typically have pistons that present a larger effective area (and thus push pads with more clamping force) than the wheel cylinders in drum brakes, which use smaller pistons to push the shoes. With the same hydraulic pressure, the larger piston area of a caliper translates to a greater force at the brake surface. Therefore, wheel cylinders deliver less force than calipers. If pressure or piston size increases, force would rise, but in standard designs, the caliper setup generally provides more braking force.