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Why does the car shake when braking in D gear?

2 Answers

LaylaRose

09/02/25 5:57am

When in D gear, the engine's power can be transmitted to the transmission, and the transmission can then transfer the power to the wheels. However, if the brakes are applied, the wheels cannot rotate, causing the car body to shake. There are three common types of automatic transmissions in automatic cars: AT Transmission: The most mature and widely used automatic transmission. The AT transmission can be referred to as a torque converter transmission, which connects to the engine via a torque converter. The AT transmission contains many planetary gears, and it relies on these planetary gears to change speed and torque. CVT Transmission: A transmission with a relatively simple internal structure. This transmission consists of only two cone pulleys and a steel belt. The steel belt can move along the cone pulleys, allowing the transmission to adjust speed and torque. Dual-Clutch Transmission (DCT): A product developed based on manual transmissions. This transmission has one additional clutch and a set of gear-shifting control mechanisms compared to a manual transmission. One clutch in the DCT controls the odd-numbered gears, while the other controls the even-numbered gears. The DCT offers fast gear-shifting speeds and relatively high transmission efficiency.

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LeviMarie

09/14/25 8:02am

I often experience the issue of shaking when stepping on the brake in D gear, especially at red lights where the car wobbles annoyingly. Common causes include aging engine mounts, cracked rubber components losing their cushioning effect, leading to idle vibrations transmitting to the body. Additionally, the torque converter in the transmission might be faulty, causing unstable oil pressure that makes the entire system shake. Excessive carbon buildup clogging the intake can also result in uneven engine RPM. While driving, you can try shifting to neutral for comparison—if the shaking stops, it's likely a gear-related issue. Don't delay addressing this; worsening vibrations may lead to stalling or affect braking distance. It's always wise to visit a reliable repair shop promptly to avoid unexpected disruptions to your travel plans.

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