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.

General Motors Gm Genuine Parts 178 0856 Power Brake Booster

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

Help Track order

Account Cart

52215CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

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Description

🚗 Upgrade your brake system with GM Genuine precision — because safety can’t wait!

COST EFFECTIVE OEM QUALITY - Save up to ⅔ dealership price without compromising authenticity
PLUG AND PLAY INSTALLATION - Flange mount design for seamless replacement
DURABILITY THAT GOES THE DISTANCE - Built to withstand up to 248°F for long-lasting reliability
PRECISION ENGINEERED FOR PEAK PERFORMANCE - GM OE spec ensures flawless fit, form, and function
TRUSTED BY PROFESSIONALS LOVED BY DRIVERS - GM-recommended part with 4.4-star rating and rave reviews

The GM Genuine Parts 178-0856 Power Brake Booster Vacuum Sensor is a factory-spec replacement sensor designed to detect pressure issues in your GM vehicle’s power brake booster. Manufactured by ACDelco to meet GM Original Equipment standards, it guarantees precise measurement accuracy (±1%), durability up to 248°F, and a perfect fit with its flange mount design. Trusted by professionals and backed by strong customer reviews, this sensor offers reliable performance and cost-effective maintenance for your GM vehicle.

Specifications

ASIN	B007QBK58I
Best Sellers Rank	#80,236 in Automotive ( See Top 100 in Automotive ) #22 in Car Power Brake Systems
Brand	GM GENUINE PARTS
Brand Name	GM GENUINE PARTS
Customer Reviews	4.4 out of 5 stars 32 Reviews
Included Components	Sensor Asm
Item Dimensions	15.2 x 15.2 x 2.5 centimeters
Item Type Name	Sensor Asm
Item dimensions L x W x H	15.2 x 15.2 x 2.5 centimeters
Manufacturer	ACDelco
Material	Metal
Material Type	Metal
Measurement Accuracy	±1%
Measurement accuracy	±1%
Model	178-0856
Mounting Type	Flange Mount
Mounting type	Flange Mount
Output Type	electrical signal
Part Number	20876877
Sensing Distance	6 Inches
Specific Uses For Product	automotive
Style	Modern
Style Name	Modern
UPC	707773774410
Unit Count	1 Count
Upper Temperature Rating	248 Degrees Fahrenheit

Reviews

R**O

Excelente

Llegó antes de lo planeado, es pieza original

3.06.2023

C**C

Worked on my 2011 Traverse

This part fixed my breaking issue on my 2011 Chevy Traverse and was 1/3 the cost of the dealership. Was the exact same OEM park from Chevy. Would buy again, hopefully wont have to.

19.02.2025

G**K

Right part!!

My Brake light came on intermittently and said traction control off. Service brake system. Had the code read. C1100. It recommended changing this sensor. 2011 Chevy traverse. This the exact OEM Bosch part that I removed. Thanks!

12.11.2022

D**Z

Service brake system

I got an error code to service my brake system, after watching a few YouTube videos this fixed it.

30.04.2021

K**A

The best

21.07.2021

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52215CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.

1 month ago

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