If a vehicle pulls to the left while braking, it may be because of:

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Unequal braking force on the left and right wheels causes the vehicle to pull to one side when you brake. If the left side is applying more braking force or dragging, the car will yaw toward the left.

A seized brake caliper on the left side keeps the pad pressed against the rotor, so that wheel experiences more braking effort and drags, pulling the car to the left. If the rotor on that side was machined incorrectly, the pad contact can be uneven, making one side bite harder than the other and creating a pull. A leaking axle seal can allow contamination or drag on the left side of the braking system, again creating an imbalance in braking force and pulling toward that side.

Other possibilities: worn tires on one side can affect handling but braking-induced pull is more reliably explained by a braking force imbalance; road crown affects steering due to road slope rather than brake force; low brake fluid changes pedal feel more than it creates a consistent left pull.