What Causes Low Rumbling Sound When Braking?

Noticed while braking your car starts to produce a low rumbling sound when braking, this may be caused due to several reasons which may include

These sounds may warn of impending danger. It is safe to conduct a soundcheck to determine the source of these noises. In this section, we’ll go over the leading causes of such noises.

When braking, a low rumbling sound is usually caused by worn brake pads. Because of poor alignment or bad bushing, your brake pads may wear unevenly. This problem can be resolved by replacing your vehicle’s brake pads.

What Causes Low Rumbling Sound When Braking?

Take a quick look at the three most common causes of noisy brakes. Each is thoroughly discussed in the sections that follow.

1. Worn-out braking pads:

One of the many causes of strange braking sounds is worn-out braking pads. Graphite, iron, and copper are common materials used to make brake pads. These components are fused to form the brake pad. When you use the brakes, the brake pad wears out until the outer metal cover comes into contact with the rotors. When braking at a low speed, low rumbling sound when braking happens.

2. Worn-out rotor discs:

Rotor disc wear can occur as a result of braking with worn-out braking pads or braking with a cheap/low-quality braking pad that scratches the surface of the rotors. As a result, the surface of your rotors will never remain flat.

3. When braking, there is a thud from the rear.

This brake problem will irritate the driver while draining the technician’s life force. It took me months at first to figure out what was causing the thumping noise in the back of a vehicle. After tearing apart the vehicle’s rear and lubricating every bushing

4. Broken Shims:

Brake pad shims are thin rubber or metal adhesive that fits between the brake caliper and the brake pad to fill small gaps that can cause noise. A worn-out shim will make metal-on-metal contact, resulting in a grinding sound.

Fixing The Braking Issues

There are several solutions to this noise. The first is to replace the rear drums. A second, less drastic method is to remove the drums, mount them on a lathe, and use coarse sandpaper to sand the crap out of the mating surface.

1. Examine the brake pads:

Examine the brake pads for wear or replacement. This is the most common issue that many drivers face when driving. Many braking pads have a wear indicator that makes a noise when it is worn out.

2. Check the brake rotors:

The final check is to inspect the braking rotors. While driving your vehicle and changing braking pads, the brake rotors may be affected.

The rotor surface must be extremely smooth. So, if the rotor wear is not too severe, you may need to have your rotors machined to smooth out the rotor surface. Before machining, always check the rotor thickness.

3. Noise from Squealing Brakes

If you hear a squealing noise when you apply the brakes, the group of tabs attached to the brake pads may have gradually become exposed, and the brake pads have worn out to the point where they must be replaced.

Furthermore, it causes the metal tab to come into contact with the steel of the brake rotor, resulting in a squeal, indicating that it needs to be replaced.

If the tab is missing in certain pads, the squealing noise indicates that only the metal backing plate is left, and it is rubbing against the spinning rotor.

Cost Of Brake Repair Job

Depending on what is wrong and what needs to be replaced, brake jobs can cost between $150 and $650 per axle which may fix low rumbling sound when braking. If your vehicle’s rotors and pads need to be replaced, your brake job will be more expensive.

If the rotors need to be replaced, ask the mechanic if they can be resurfaced to save you some money. If they can resurface them, you could save between $100 and $150.

FAQs

1. How Do I Stop My Brakes From Squeaking?

A. To stop squeaking brakes, remove all brake pads, disassemble the calipers, lubricate all moving caliper parts with high-temperature grease, and lubricate all caliper-to-brake pad contact points with brake pad lube.

Other methods exist, such as sanding the brake pad surface or shaving the leading edge of the brake pads.

2. What Can Cause a Braking System Grinding Noise?

When a brake pad’s life is up, a grinding noise can be heard in the system. Another common brake grinding noise occurs when small pebbles become trapped between the rotor and rotor backing plate.

Conclusion

Finally, low rumbling sound when braking serves as an early warning sign of a serious problem. In this guide, we learned about the causes and types of braking noise problems, which can help you protect yourself from the causes and respond quickly. If you suspect a problem with the braking system, self-diagnose the problem and attempt to repair it yourself. However, if you are unsure about the failure in your vehicle, simply take it to the nearest authorized workshop.