How many liters of brake fluid should be replaced for a sedan at one time?
2 Answers
Generally, only 1 to 2 liters of brake fluid need to be replaced. Here is some information about brake fluid: 1. The cost of replacing brake fluid varies depending on the vehicle model, with total expenses ranging between 150 and 400. This price includes the labor cost at a 4S shop. If you want to save money, you can go to an auto repair shop for the replacement. However, it's important to note that it's best not to go to small shops for the replacement, as accidents may occur. 2. Replacing brake fluid by yourself is the cheapest option, only requiring the cost of purchasing the brake fluid (which must meet specifications). However, the process is quite troublesome and requires the cooperation of 2-3 people. One person presses the brake, another observes whether bubbles emerge from the brake fluid reservoir, and the third person replenishes the brake fluid. But don't be too casual—simply adding brake fluid without paying attention can lead to air in the brake lines, affecting the vehicle's braking performance. Additionally, during the replacement process, it's necessary to completely drain the brake fluid from all four wheels' pipelines.
For the amount of brake fluid replacement in sedans, based on my experience of changing it multiple times, I feel that about 1 liter is generally sufficient. My old Toyota requires a whole new bottle each time, which is just enough to flush the entire system. Brake fluid tends to absorb moisture, and over time, it can reduce braking performance. Therefore, I make sure to replace it every two years or 40,000 kilometers to prioritize safety. I also regularly check the fluid level and color in the reservoir—if it turns dark or has particles, it needs immediate attention. Never skimp on this expense, as brake system issues can be life-saving in critical moments. I've seen many failures caused by minor negligence. In short, the fluid replacement process requires two people to cooperate in pumping the pedal for bleeding, and when buying fluid, DOT4 standard works perfectly fine.
