Why do brakes need to be replaced in the first place?

Friction material on the brake pads or shoes rubs against rotors or drums to slow the vehicle. In time, that material wears away and the pads/shoes must be replaced. Sometimes the rotors and drums also must be replaced.

What’s the squealing sound I hear when braking?

Over time, wear indicators in brakes pads may contact the rotors’ surface when braking, resulting in a metallic squealing sound. Vehicles equipped with wear sensors may also provide an alert that minimum brake pad thickness has been reached.

What if it’s more of a grinding sound?

If all the friction material has been worn away, the metal backing plate of the brake pad will be the material in contact with the rotor during braking. It causes a grinding sound and braking performance is often diminished.

What about vibrations or shaking in the steering wheel?

This is more serious than pulsation. If the brakes are very worn or the rotors are warped, there can be a significant vibration or shaking in the steering wheel when braking. It may mean brake service is needed immediately.

Why do the brakes seem to pulsate when stopping?

It may be due to poor-quality brake pads, warped rotors or unevenly worn tires. Have the pulsation diagnosed as soon as possible to avoid the possibility of greater brake system wear or damage.

Acdelco Silver Rear Brake Rotor 18a81032a Gm 19340370 Brake Rotors

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

🚗 Upgrade your ride with brakes that perform as hard as you do!

EXTEND YOUR BRAKE LIFE - Smooth rotor surface reduces pad wear, saving you money and hassle on replacements.
PERFECT FIT EVERY TIME - Vehicle-specific compatibility verified with easy VIN check ensures seamless installation on your GM ride.
STAY COOL UNDER PRESSURE - Multi-alloy vane design maximizes airflow to prevent brake fade during intense drives.
WHISPER QUIET PERFORMANCE - Non-directional ground finish and balanced rotor design eliminate annoying brake noise and vibrations.
BUILT TOUGH FOR DAILY DEMANDS - Rounded radius edges enhance structural strength to withstand high heat and heavy loads.

The ACDelco Silver Rear Brake Rotor 18A81032A is a precision-engineered, cast iron rotor designed for select GM vehicles including Chevy, Cadillac, and GMC models. Featuring multi-alloy construction and optimized vane configuration, it delivers superior heat dissipation and reduced brake fade. Its non-directional ground finish minimizes noise and vibration, while a smooth surface extends brake pad life. Built for durability with reinforced edges, this rotor ensures a perfect vehicle-specific fit backed by a 24-month unlimited mileage warranty.

Specifications

ASIN	B01N8XVZR8
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#606,276 in Automotive ( See Top 100 in Automotive ) #915 in Automotive Replacement Brake Rotors
Brand	ACDelco
Brand Name	ACDelco
Compatible with Vehicle Type	Cars, Sport-Utility-Vehicles, Trucks
Customer Reviews	4.4 out of 5 stars 122 Reviews
Exterior Finish	Machined
Global Trade Identification Number	00808709419297
Included Components	Brake Rotor
Item Type Name	Brake Rotor
Item Weight	22.4 pounds
Manufacturer	ACDelco
Manufacturer Part Number	19340370
Manufacturer Warranty Description	24 Months / Unlimited Miles Limited Warranty (Parts Only). Please see ACDelco.com for more details
Material	Cast Iron
Material Type	Cast Iron
Model Number	18A81032A
Number of Items	1
OEM Equivalent Part Number	19340370
UPC	808709419297
Unit Count	1 Count
Vehicle Service Type	Cars, Sport-Utility-Vehicles, Trucks

Reviews

S**N

Great rotors.

Replaced my front and rear rotors on my 2015 5.3 Z71 4x4 crew cab Silverado with these AcDelco rotors and they work great. Fit is perfect, zero noise with ceramic pads, was easy to install and look good. Been on my truck for 2.5yrs with zero issues.

9.04.2025

W**R

A Great replacement

This fits just right and worth getting especially for the rear brakes

15.07.2026

D**G

Perfect fit

Would buy again fit perfectly

26.09.2024

T**S

It can’t be that difficult

If you want your product opened, delayed and delivered to the wrong door then I would recommend Amazon and this delivery service. The item I’m sure is fine

20.06.2026

A**R

Good product

Good value for money.

4.08.2021

A**R

Rotors

Perfect.. great price

7.10.2021

S**E

Good quality OE replacement part

Good parts

2.10.2021

A**E

OEM fit but will rust

These rotor fit just like OEM and preform (stopping power) great. They squeak and rust quickly, but for the money they are a decent value

4.07.2024

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The delivery time was excellent, and the packaging was secure.

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ACDelco Silver Rear Brake Rotor 18A81032A | GM 19340370 Brake Rotors for Select Chevy, Cadillac Escalade, Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe, GMC Sierra, Yukon, and more

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