In order to ensure driving safety, all car brake pipes are now double-pipe brakes. The use of independent dual-chamber brake master cylinders is a feature of the dual-pipe hydraulic brake transmission device. Two sets of independent pipelines control the wheel brakes of the two or three axles respectively. Its characteristic is that if one of the pipelines fails, the other pipeline can still continue to brake, thereby improving the reliability of automobile braking and driving safety.

The distribution of pipelines mainly includes:
①One axle to one axle type: The front wheel brake and the rear wheel brake each have a set of pipelines. This arrangement is the simplest. It is generally used in an arrangement of front-end rear-wheel drive of the engine. The disadvantage is that a certain pipeline fails. At this time, the ratio of the front and rear axle braking force distribution is destroyed.
②Cross type (X type): The two wheels in the diagonal direction of the front and rear wheels share a set of pipelines. When any pipeline fails, the remaining total braking force can be maintained at 50% of the normal value, and the front and rear axles are controlled. The power distribution ratio remains unchanged, which helps to improve braking stability. This form is mostly used in front-drive cars
③One-shaft half-to-half axle type: each front wheel brake is required to have two wheel cylinders, one wheel cylinder of each front wheel brake and all rear wheel brake wheel cylinders belong to a set of pipelines, and the remaining front wheel cylinders belong to Another casing circuit
④Semi-shaft, one-wheel-to-half-shaft, one-wheel type (LL type): each front wheel brake is required to have two wheel cylinders, and the two sleeve circuits are for each front wheel brake and one rear wheel brake wheel cylinder. kick in. When any casing circuit fails, the front and rear wheel braking force ratio is the same as the normal situation, and the remaining total braking force can reach 80% of the normal value
⑤ Double semi-axle vs. double semi-axle type (HH type): Each brake is required to have two wheel cylinders, and each set of brake lines controls one wheel cylinder for each brake. When any casing circuit fails, the braking ratio of the front and rear wheels is the same as the normal value, and the remaining total braking force can reach 50% of the normal value.
So when a pipeline is broken, it does not mean that the entire brake system is useless, but the braking force becomes worse, and it can be used at low speeds, but for your safety, it is better to repair it at speed.