Reasons and Solutions for Vibration When Braking in D Gear

[DeEverett]

Reasons and solutions for vibration when braking in D gear are as follows: 1. Continuous and obvious vibration in D gear: The situation improves immediately after shifting to N gear. This may be due to interference between the engine, transmission, exhaust pipe, and the floorboard or body, or aging and cracking of damping rubber, causing the engine's normal vibration to be directly transmitted into the car. The most common cause is insufficient clearance between the lower part of the engine and the floorboard. In neutral gear, there might still be some clearance, but when shifting to D gear, the engine's displacement under load causes direct contact with the floorboard. Other causes include aging or cracking of engine damping rubber, deformation of the exhaust pipe, or aging of exhaust pipe hangers. Typically, such faults can be resolved by prying open certain parts of the engine or exhaust pipe, and the vibration disappears immediately. 2. Intermittent vibration: This may be caused by a dirty throttle valve, excessive carbon deposits in the intake pipe leading to low idle speed, misfiring in the ignition system (bad spark plugs or ignition coils), or poor fuel quality. These issues are related to the engine's operating condition. Shifting to N gear may improve the situation, but occasional engine vibration can still be felt. Based on the vehicle's mileage, check for carbon deposits or spark plug condition, or try changing the fuel and observe. 3. Resonance: This can be caused by improperly installed, loose, or resonating parts in the engine compartment, such as the intake pipe, air filter housing, radiator, headlights, gear shift cable, wiring harness, etc. Loose or improperly installed components inside the dashboard can amplify normal vehicle vibrations through resonance. This can only be resolved by careful inspection and resetting or by slightly increasing the idle speed to avoid the resonance point. Additionally, issues like internal jamming in the compressor, excessive load, or excessive clearance in the cooling fan may also cause noticeable vibration in D gear. Different models or individual vehicles may vary. Generally, cars in D gear will have slightly more vibration than in N gear. If the vibration in D gear is noticeably affecting comfort, it is recommended to have the vehicle inspected at a dealership or repair shop.

[DiAndrew]

I've encountered this issue with my automatic transmission car. Shaking when in D gear and pressing the brake is commonly caused by aging engine mounts. The mounts are rubber components designed to absorb engine vibrations, which can crack or harden after several years of use, making them less effective at absorbing shakes—especially noticeable in small-displacement vehicles. The solution is to check if the mounts are collapsed or cracked. If they're damaged, they need to be replaced, typically costing around two to three hundred yuan. Those with good DIY skills might handle it themselves, but it's best to have them professionally installed to avoid misalignment. Additionally, dirty spark plugs or issues with ignition coils can also cause similar shaking, which can be resolved with regular maintenance cleaning. Long-term neglect can spread vibrations, damaging other components like exhaust pipe joints and leading to unnecessary repair costs. Therefore, I recommend addressing the issue as soon as it's noticed, before the shaking worsens and affects driving comfort and safety.

[VonJayce]

I've been maintaining my car for a while now, and I've noticed that this kind of shaking often comes from the torque converter in the transmission or worn clutch plates. When in D gear, the engine power is transmitted through the torque converter, and if the oil pressure inside is unstable or parts are damaged, it can slip and shake when braking. Solutions include first checking the condition of the transmission fluid—if it's black or has a burnt smell, it needs to be changed. Sometimes adding a specialized additive can help alleviate the issue. Another possibility is an engine vacuum leak causing uneven air intake. Listen for any hissing sounds, and if a hose is broken, use tape as a temporary fix. For prevention, I recommend avoiding prolonged periods of heavy braking in traffic jams, regularly changing the air filters, and keeping the engine running smoothly to reduce such problems. If the shaking persists after changing the fluid, it's best to have a technician scan the transmission computer data with a diagnostic tool to prevent the issue from escalating into more expensive repairs.

[GabrielleAnn]

As a new driver who just learned how to drive, I was terrified when the car shook while braking in D gear—I initially thought the engine was broken! Later, the mechanic explained it's a common minor issue. For example, worn-out spark plugs failing to ignite can cause engine shaking. To check this yourself, just open the hood and see if the spark plugs have carbon buildup or appear blackened. A simple cleaning or spending a few dozen bucks on new ones can fix it. It could also be unevenly worn brake pads getting stuck, causing vibrations when braking due to uneven contact. Just have a repair shop resurface or replace the brake discs. To prevent this, lightly press the accelerator when driving and avoid prolonged high-temperature operation. After the repairs, the car became much more stable. New drivers shouldn't panic—it's not a major issue but should be addressed promptly.