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.

Acdelco Gm Genuine Parts 178 0857 Power Brake Booster Vacuum

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

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

Help Track order

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€ 88.81

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

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Description

🚦 Stay in control with GM precision – don’t let brake issues slow you down!

GM RECOMMENDED QUALITY - Backed by GM’s endorsement, this sensor delivers the performance your vehicle deserves.
EFFORTLESS INSTALLATION - Flange mount design guarantees a quick, hassle-free replacement—get back on the road faster.
PRECISION YOU CAN TRUST - Engineered with ±1% measurement accuracy for flawless brake system monitoring.
SEAMLESS GM COMPATIBILITY - Manufactured to GM Original Equipment specs ensuring perfect fit and function every time.
DURABILITY MEETS RELIABILITY - Built with premium metal and plastic materials to withstand long-term automotive demands.

The ACDelco GM Genuine Parts 178-0857 Power Brake Booster Vacuum Sensor is a GM-recommended replacement part engineered to meet original equipment specifications. Featuring ±1% measurement accuracy and a flange mount design, it ensures a perfect fit and reliable performance for GM vehicles. Crafted from durable metal and plastic, this sensor offers long-lasting service life and easy installation, making it the trusted choice for maintaining optimal brake system function.

Specifications

ASIN	B005OVN0OS
Best Sellers Rank	#103,288 in Automotive ( See Top 100 in Automotive ) #37 in Car Power Brake Systems
Brand	GM GENUINE PARTS
Brand Name	GM GENUINE PARTS
Customer Reviews	4.6 out of 5 stars 98 Reviews
Global Trade Identification Number	00707773796788
Included Components	Brake Booster Vacuum Sensor
Item Dimensions	15.2 x 15.2 x 2.5 centimeters
Item Type Name	Brake Booster Vacuum Sensor
Item Weight	0.02 Pounds
Item dimensions L x W x H	15.2 x 15.2 x 2.5 centimeters
Item weight	0.02 Pounds
Manufacturer	ACDELCO
Material	Metal Plastic
Material Type	Metal Plastic
Measurement Accuracy	±1%
Measurement accuracy	±1%
Model	178-0857
Mounting Type	Flange Mount
Output Type	Electrical Signal
Part Number	20903152
Specific Uses For Product	automotive, GM, brake systems
Style	Modern
Style Name	Modern
UPC	707773796788 707773786222
Unit Count	1 Count

Reviews

J**P

perfect git

perfect fit and fixed my car

5.07.2026

M**.

Super easy to install

Works as expected. Thanks!

28.05.2026

A**R

Fixed “Service Brakes” message 2011 Silverado

Worked great on 2011 Chevy Silverado 1500 LT 5.3 L with 85000 miles. Plug and play basically. No longer have service brake message.

24.11.2023

F**I

c0299-5a code

2011 Tahoe LTZ 5.3L with c0299-5a code "Service Brakes Soon" Replaced sensor. Perfect fit. No codes.

30.07.2025

C**D

No worries

Fine. It did not fit

28.07.2021

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€ 88.81

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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