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

Friction material on the brake pad contacts the rotors to slow the vehicle. In time, that material wears away and the pads must be replaced. Sometimes the rotors and calipers must also be replaced.

What’s the squealing sound I hear when braking?

Over time, wear indicators in brake 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.

Why do the brakes seem to pulsate when stopping?

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

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 unevenly worn, there can be a significant vibration or shaking in the steering wheel when braking. It may mean brake service is needed immediately.

19420962 Brake Master Cylinder

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Description

🚗 Stop with confidence — GM Genuine Parts master your brake game!

OEM GRADE DURABILITY - Manufactured to GM Original Equipment specs ensuring flawless fit, form, and function.
CERTIFIED RELIABILITY - Meets rigorous SAE J1153 & J1154 brake performance standards for unmatched quality.
LONG LASTING PERFORMANCE - Built to provide the durability and service life you expect from genuine GM parts.
PRECISION PRESSURE TESTED - Engineered to deliver safe, confident braking every time.
SEAMLESS VEHICLE INTEGRATION - GM-recommended replacement part designed specifically for your GM vehicle’s original system.

The GM Genuine Parts 19420962 Brake Master Cylinder is a precision-engineered hydraulic pump designed to meet GM’s original equipment standards. Pressure tested and certified to SAE J1153 and J1154, it ensures reliable, safe braking performance with a perfect fit for GM vehicles. Trusted for durability and seamless integration, this master cylinder delivers the quality and longevity expected from GM OE parts.

Specifications

ASIN	B08SHN11G7
Best Sellers Rank	#993,737 in Automotive ( See Top 100 in Automotive ) #3,174 in Automotive Replacement Brake Hydraulic Parts
Brand	GM GENUINE PARTS
Customer Reviews	3.2 3.2 out of 5 stars (8)
Date First Available	January 8, 2021
Exterior	Machined
Item Weight	3.13 pounds
Item model number	19420962
Manufacturer	ACDelco
Manufacturer Part Number	19420962
Model	GM Original Equipment
Product Dimensions	10.3 x 8.7 x 5.3 inches

Reviews

N**E

18.02.2025

R**N

6.05.2025

�**�

13.06.2025

J**A

20.06.2025

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