Skip the auto shop - Our mechanics make house calls

Q: Knock sound while braking

asked by on

I always hear a knock sound when I brake my car. The sound come out of the left wheel

Hello. A knocking sound when braking is most likely from the brake pads moving inside the caliper bracket and the rotors having a warped surface causing the pad movement. The pads may be aftermarket and not fit tight enough in the caliper bracket. I would recommend having the pads replaced and the caliper brackets checked for wear on the pad contact surfaces and replace them if they are. Also replace the front rotors or have them resurfaced if they can be. If you would like to have this diagnosed for you, a certified technician from YourMechanic can inspect the brake system and let you know what repairs are needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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

Q: Noise coming from rear wheel

A rubbing or scrapping noise coming from the rear of this vehicle is most commonly caused by one of two things. The rear wheel bearings that are part of the rear hubs are going bad. These wheel bearings are not...

Q: 1998 Saab 900 SE Turbo won't hold power after a jump

It sounds like you may have a weak battery from the extended periods of sitting. As you may know, even a vehicle with a properly functioning charging system (i.e. alternator, voltage regulator, etc) will ultimately not keep a battery properly...

Q: Loss of power using turbo

It sounds like the vehicle is going into limp mode. This occurs when the powertrain control module (PCM) (also known as the electrical control unit) has determined there is an overboost condition. The computer disables the turbo to prevent damage...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...