A brake system having a first hydraulic supply line and a second hydraulic supply line in which an operating fluid is individually provided from a master cylinder of a vehicle, the brake system comprising: a first hydraulic line having a first valve and branched from the first hydraulic supply line to connect between a first caliper of a first wheel brake; a second hydraulic line having a second valve and branched from the first hydraulic supply line to connect between a second caliper of a second wheel brake disposed on a diagonal line of the first wheel brake; a third hydraulic line having a third valve and branched from the second hydraulic supply line to connect between a third caliper of a third wheel brake in a position opposite to the second wheel brake; a fourth hydraulic line having a fourth valve and branched from the second hydraulic supply line to connect between a fourth caliper of a fourth wheel brake disposed on a diagonal line of the third wheel brake; characterized in that the brake system further comprises: a third switch valve disposed on one of the first hydraulic supply line and the second hydraulic supply line; a fourth switch valve which is one of the second valve or the third valve; a fifth hydraulic line having a first switch valve and configured for connecting the first hydraulic line with the fourth hydraulic line; a sixth hydraulic line having a second switch valve and configured for connecting the second hydraulic line with the third hydraulic line; and a brake control unit configured of determining when the vehicle satisfies a first condition which is in a normal traveling state of the vehicle, or when the vehicle satisfies a second condition which is in an alpine traveling state of the vehicle. a first hydraulic line having a first valve and branched from the first hydraulic supply line to connect between a first caliper of a first wheel brake; a second hydraulic line having a second valve and branched from the first hydraulic supply line to connect between a second caliper of a second wheel brake disposed on a diagonal line of the first wheel brake; a third hydraulic line having a third valve and branched from the second hydraulic supply line to connect between a third caliper of a third wheel brake in a position opposite to the second wheel brake; a fourth hydraulic line having a fourth valve and branched from the second hydraulic supply line to connect between a fourth caliper of a fourth wheel brake disposed on a diagonal line of the third wheel brake; characterized in that the brake system further comprises: a third switch valve disposed on one of the first hydraulic supply line and the second hydraulic supply line; a fourth switch valve which is one of the second valve or the third valve; a fifth hydraulic line having a first switch valve and configured for connecting the first hydraulic line with the fourth hydraulic line; a sixth hydraulic line having a second switch valve and configured for connecting the second hydraulic line with the third hydraulic line; and a brake control unit configured of determining when the vehicle satisfies a first condition which is in a normal traveling state of the vehicle, or when the vehicle satisfies a second condition which is in an alpine traveling state of the vehicle. a third switch valve disposed on one of the first hydraulic supply line and the second hydraulic supply line; a fourth switch valve which is one of the second valve or the third valve; a fifth hydraulic line having a first switch valve and configured for connecting the first hydraulic line with the fourth hydraulic line; a sixth hydraulic line having a second switch valve and configured for connecting the second hydraulic line with the third hydraulic line; and a brake control unit configured of determining when the vehicle satisfies a first condition which is in a normal traveling state of the vehicle, or when the vehicle satisfies a second condition which is in an alpine traveling state of the vehicle.