Q: Why sometimes car vibrates at low speed?

asked by on

Hi everyone. I purchased used Ford Focus 2012 a month ago and its mileage is around 40400 miles.

In the first week itself, I've noticed Screeeeeech sound while taking reverse and then applying brakes. The frequency of hearing this sound is very less.

And then after few weeks, I noticed huge vibration in steering for about 3 to 4 seconds while accelerating at lower gear.

And today, I noticed the same problem. The vibration is much greater than before and it happened when I apply brakes. The first vibration occurred when I slowed down in speed breaker and the second happened when I applied brakes during the turn and I was about to lose the control.

So, after noticing these things I went to mechanic explained him everything. Unfortunately, none of the things happened when he took the test drive.

Any idea what's going on with my car? I don't have even basic knowledge to I identify where the problem is.

Any help is appreciated.

Hi There, What you are describing is a sign of warped brake rotors. As you may know, when you press on your brake pedal, this activates a hydraulic pressure which forces small pistons inside your brake calipers to push the brake pads against the brake rotors which is what causes the stopping power you are familiar with. When this happens, an enormous amount of heat is generated due to the friction between the brake pads and rotors. As the brake rotors eventually cool down and then heat up again the next time you press on the brakes, over time this can cause them to warp slightly causing very small low spots on the surface of the brake rotor. When this happens and the brake pads are applied again to the rotors, this causes an uneven surface (on the rotor) to be applied to the flat surface brake pad, which can cause a vibration, shaking or very loud grinding sound. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your brake rotors.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Why sometimes car vibrates at low speed?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My rear piston will not compress on my 2014 Ford Focus titanium

The rear calipers does not just screw in but requires to be pressed in at the same time it is being turned. If it still does not go in then you need to replace the caliper.

Q: My radio works, but my sync system for my 2012 Ford Fusion dosent, what’s the problem?

Most likely the Bluetooth function of your stereo is integrated into the radio unit itself. Therefore the radio itself would likely need to be replaced in order to resolve this issue unfortunately. I would recommend having the radio unit inspected...

Q: How do I open the fuel tank cap?

You have to open the fuel tank cap when you want to put gas in or an additive. You want the engine to be shut off for safety. Locate the fuel door release lever, which is on the floor by...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...