What are the reasons for the BMW 3 Series brakes not working properly?
2 Answers
The BMW 3 Series brakes not working properly may be due to excessive impurities in the brake master cylinder, poor sealing, failure of the vacuum booster pump, dirty brake fluid or the formation of air resistance when several types of brake fluid are mixed and heated, leakage in the brake master cylinder or wheel cylinder, or air leakage in the air reservoir or pipeline connections. Relevant information about the BMW 3 Series is as follows: 1. Exterior: In terms of exterior, the domestically produced new 3 Series largely retains the design style of the overseas version of the new 3 Series. The sharp LED headlights connect with the enlarged glossy black kidney grille, complemented by the front bumper air intake and three-dimensional lines. The new 3 Series Li model features the latest Hofmeister kink design on the C-pillar, eliminating the "small tail" characteristic of the current long-wheelbase version. In terms of dimensions, the overall size has increased compared to the current long-wheelbase 3 Series. Compared to the overseas version, the new 3 Series long-wheelbase version has a significant 110mm increase in wheelbase. At the rear, the car adopts a straight and sharp taillight outline with L-shaped red light strips inside. Additionally, the M Sport version includes black trim with color separation treatment and ventilation holes on both sides, paired with a small spoiler and a dual-exhaust layout. 2. Interior: For the interior, the new BMW 3 Series long-wheelbase version largely follows the main design of the overseas model. For example, it features a new floating LCD screen, a newly designed electronic gear lever, and an M-branded three-spoke multifunction steering wheel. 3. Powertrain: In terms of powertrain, the new BMW 3 Series long-wheelbase version is equipped with the latest B-series 2.0T engine (B48B20B type), which has the same 184 horsepower as the current 320i/Li, but the tail badge has been changed to 325Li. The transmission is still the 8-speed automatic gearbox. Additionally, improvements in lightweight construction, thermal energy management, and fuel efficiency optimization enhance the vehicle's power output. Furthermore, the new car maintains a 50:50 weight distribution.
I've been driving a BMW 3 Series for five or six years. Last year, I almost couldn't stop in time while going downhill on a mountain road, which scared me to death. The main reasons were that the brake pads were too thin, resulting in insufficient friction after long-term wear, and the brake fluid had aged and turned black, with water bubbles mixed in, affecting pressure transmission. When I took it to the shop for inspection, they found that the vacuum booster was also leaking air, causing the brake pedal to feel hard and lacking power when pressed. BMW's braking system is finely designed, but neglecting maintenance can easily lead to problems. It's recommended to check the brake pad thickness and fluid level every 20,000 kilometers. If the fluid reservoir turns black, it's time to replace the fluid. Additionally, shallow tire treads can easily cause skidding, especially in rainy or snowy weather. Developing a habit of regular self-checks, such as gently pressing the brake pedal a few times to feel for changes in firmness, can save you from major trouble and protect your life.
