Squealing when driving and breaking and rpms jump by 500 ...

Q: Squealing when driving and breaking and rpms jump by 500 while driving.

asked by on December 28, 2016

When i am driving a high pitched squeal happens intermittently when i brake sometimes. Also the rpms will jump up by about 500 almost viciously while driving even at a steady pace. What can i do to fix this?

My car has 240000 miles.
My car has an automatic transmission.

Hello There, It sounds like you may have two separate issues going on here. The squealing sound is likely your brake pads which have wear indicators on them that are designed to produce a squeaking sound signaling that it may be time to replace them soon. The RPM fluctuation may be due to a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital information to the ECM which uses this to make adjustments to fuel supply to the motor. A dirty or faulty sensor can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions causing a jerking reaction or loss of power in some cases. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

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

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

Car leaking power steering fluid

The serpentine belt rides on some pulleys that are smooth. If you do have oil leaking onto it, it is possible for it to slip off. The rack and pinion is located close to the firewall of the vehicle and...

My truck jumps and shakes when accelerating

It is possible for problems with the ignition system to cause this issue, including spark plugs or ignition coils not firing under load. You should have a scan for trouble codes done to check for codes related to the misfiring....

Brake changes on my 2007 Kia Picanto

You may not need brakes but should get them inspected to see if they are worn down or just noisy. If you are having to replaced the brakes every 4000km or six months, then you have issues with the calipers...

Related articles

How to Clean Brake Dust
Brake Brake dust is residue that accumulates on a car’s wheels over time. The dust comes from the brake pads, which wear down over time from the friction of braking. The pads slowly wear down, and the worn off material...
3 Ways to Increase the Average Life of Car Brakes
Car brakes are essential to safe driving. Extend the life of your brakes with soft braking, coming to a complete stop, and removing excess weight.
How to Change Front Brake Pads
Brake pads are failing when the brakes are noisy, the brake pedal pulsates when pressed, or there is poor brake response when the pedal is pressed.