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.

Gm Genuine Parts 178 0821 20819294 Power Brake Booster Assembly

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

Help Track order

Account Cart

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

Help Track order

Account Cart

Description

🚦 Upgrade your brake game with GM precision power!

SEAMLESS GM OE COMPATIBILITY - Engineered to match your GM vehicle’s original brake booster for flawless fit and function.
BUILT TO LAST WITH GM QUALITY - Crafted with premium materials ensuring long-lasting durability and reliability under all conditions.
OPTIMIZED FOR SAFETY CONTROL - Maintains the integrity of your vehicle’s braking system, giving you peace of mind behind the wheel.
DIRECT REPLACEMENT ZERO HASSLE - GM-recommended part designed for easy installation, restoring your brake system to factory specs.
POWER BOOSTED BRAKING PERFORMANCE - Amplifies pedal force to deliver enhanced stopping power and confidence on every drive.

The GM Genuine Parts 178-0821 Power Brake Booster Assembly is a GM OE-spec replacement designed to restore and enhance your vehicle’s braking performance. Manufactured by ACDelco, it ensures perfect fit, durability, and reliable power boost to the master cylinder, delivering the trusted stopping power GM drivers expect.

Specifications

ASIN	B00559RC70
Best Sellers Rank	#4,241,887 in Automotive ( See Top 100 in Automotive ) #3,390 in Automotive Replacement Power Brake Systems
Brand	GM GENUINE PARTS
Customer Reviews	5.0 5.0 out of 5 stars (1)
Date First Available	October 25, 2010
Exterior	Machined
Item Weight	7.45 pounds
Item model number	178-0821
Manufacturer	ACDelco
Manufacturer Part Number	178-0821
Model	Brake Booster
OEM Part Number	20819294
Product Dimensions	15.88 x 13.25 x 12.88 inches

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot reviews

GM Genuine Parts 178-0821 (20819294) Power Brake Booster Assembly

Description

Specifications

Common Questions