Although the tires are new, it could happen still. Also, most tire centers recommend revisiting them within a few weeks to make sure the bolts are properly tightened. I would also still follow oldturkey03 suggestion along with the alignment.
If that didn't help - check the calliper pins, make sure they are not bent even slight bent will cause a problem. I had a case when some stupid mechanic over-tightened them up to bending them.
I had uneven break pads wear on rear, that also was partially locking disk breaks, wearing them off, increased petrol consumption, annoying sound, overheating In case of front wheels you'll get vibration. Considering you've changed break pads recently - this might be the exact problem. If that doesn't help - your break disks overheated at some point and if they are not so flat anymore - one more reason for vibration.
Process of elimination, did you have the issue before brake work? If no AND you haven't warped your front rotors due to hard braking, take it back to mechanic who did work. The fact is, with time, components including the suspensions or silent blocks are put under great stress and lose their function as vibration reducers.
In case the shift knob vibrates when starting or stopping on your Lexus IS, it is undoubtedly engine or gearbox silent blocks that are dead. In reality, their task is to reduce and absorb all the couplings and shaking of the engine and gearbox.
If these are broken, these vibrations will have repercussions on other auto parts such as the gear lever of your Lexus IS for example. The second case of a speed lever that shakes a lot on Lexus IS and a little less common.
In reality, in most cases, the rise in engine speed should blunt these tremors. If in your scenario when you accelerate this shake does not reduce or worse, you will have to fix it faster.
In truth, although more challenging to distinguish, there are different auto parts that may be the reason for the vibrations in the gear shift of your Lexus IS:. If you are in the case where it only vibrates at idle, it will be inexpensive to fix this issue.
Swaying after a turn or lane change or in cross winds. Noticeable bounciness more than one or two bounces after going over dips or bumps. Your motor mounts are what keep your engine attached to your car. If the shaking decreases when you put your car into neutral this could indicate that it is the motor mounts.
Wheel balance Tyres that are out of balance will cause a vehicle to vibrate at higher speeds usually around 50—70mph. Injectors deliver fuel into the engine by spraying fuel through a port into the combustion chamber.
It is possible for the driveshaft itself to get bent. It is much more likely that a universal joint has gone bad. The universal joint has to change the direction in which something spins. Look at the diagram below. As it wears out, there will be play between it and the driveshaft, which causes shaking when accelerating, and consistent shaking at certain speeds.
Vehicle Speed: If you have a brake caliper, your IS will shake more and more as you accelerate. A stuck brake caliper can happen to any vehicle.
It can happen for a number of reasons, such as the piston in the caliper getting stuck, or a crimped brake line. Vehicle Speed: The shaking and vibration should be felt at any speed. It will feel worse at certain speeds and better at others.
It depends on the vehicle, wheel in question, and how loose they are as to exactly what speed that would be. Lug nuts can cause a vehicle to shake when accelerating. If there is any doubt in your mind as to whether or not they are all the way tight you need to get your IS off the road as fast as safely possible and check.
Loose lug nuts usually show themselves after a tire change, rotation, or any other work that has been recently performed on the vehicle that would require the removal of a wheel. Get a torque wrench and torque all four to factory specs. Tire balance can cause an automobile to shake when accelerating. This corrects any vibration that would otherwise occur.
These weights can fall off over the life of the tire. When they do the tire will vibrate. A poor wheel alignment can cause the tires to wear unevenly and the vehicle to shake. Take a look at your wheels.
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