Skip the auto shop - Our mechanics make house calls

Q: Brake pressure low and brakes growling

asked by on

My brake light is on. In addition, my brake pressure is low and my brakes make a growling noise.

Sounds like you brake pads are down to the metal. Brake pads have a metal backing plate, but the part that actually contacts with the rotor to stop your vehicle is a friction lining usually made up of an organic material and some soft metallic fibers. When this lining wears out totally, the metal backing plate makes contact with the rotor causing a grinding noise like what you are hearing. The part that squeezes your pads onto the rotor is called a caliper. The caliper has a piston that is hydraulically driven when you step on the pedal. As the pads wear, the caliper requires more fluid to take up the space of the worn pads. This will cause a low fluid condition on the master cylinder turning your light on and the worn brake pads cause the low pedal feel. By now, I suspect there is damage to the rotors as well as a possibility that the caliper might be leaking. A complete brake inspection is necessary to see exactly what is damaged and what needs replacing.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Head Gasket replacement

Hi there: In general, the tips you've listed are very important to remember, but you are missing on very critical step - purchase a 2001 Honda Accord service repair manual and follow their specific instructions exactly. Also, if you're completing...

Q: I think my positive wire is grounded somewhere

It's possible that you have the starter cable routed in such a way that there is contact with the ground. Since it took a few minutes of driving, I wonder if you have the cable leaning against the exhaust manifold...

Q: Why does my red brake light with exclamation mark show up when I start my 2004 Audi A4

Hello. This can be caused by low brake pad lining or by low brake fluid. I would usually start by checking the brake fluid level. If the fluid level is low then it will cause this light to come on....

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.