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 18m1878 Professional Brake Master Cylinder Assembly

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

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Description

🚦 Stop at nothing—upgrade to pro-level braking power today!

TRUSTED OEM QUALITY - Manufactured by ACDelco, a GM Genuine Parts brand, guaranteeing perfect compatibility and performance.
EFFORTLESS INSTALLATION - Compact and lightweight design (635g) ensures quick, hassle-free replacement.
TOP RANKED BRAKE SOLUTION - Ranked #2 in Automobile Brake Primary Cylinders with a stellar 4.6-star rating from 799 users.
PRECISION ENGINEERED SAFETY - Certified to rigorous SAE J1153 and J1154 standards for unmatched braking reliability.
DURABLE DUAL MATERIAL CONSTRUCTION - Combines cast iron strength with aluminum lightness to reduce stress on mounting points.

The ACDelco 18M1878 Professional Brake Master Cylinder Assembly is a premium, OEM-quality replacement part engineered to meet strict SAE J1153 and J1154 brake performance standards. Featuring a robust cast iron and aluminum construction, it offers durability without added stress on brake booster mounts. Lightweight and precision-machined, this master cylinder ensures reliable, safe braking and easy installation. Highly rated and trusted by professionals, it’s the go-to choice for millennial managers who demand safety and efficiency on the road.

Reviews

A**I

Excellent and cheap

Best product as described

9.09.2025

M**K

Perfect

Perfect thank

1.07.2023

R**R

Le service est excellent et rapide

Cette pièce était nécessaire pour moi ,, car cette pièce sert a appliqué les freins d'un véhicule, les prix est excellent, la piece est complètement neuve et le service est impeccable

29.03.2022

F**Z

Reemplazo correcto para GMC K15 1977 con Booster

La pieza llegó a tiempo y es el reemplazo correcto para camioneta GMC 1977 con Booster. El producto es AC Delco original pero fabricado en china. Lo devolví porque antes de que llegara encontré otro en una refaccionaría local a mejor precio y fabricado en México, así que devolví el de Amazon sin instarlo, usarlo o probarlo, así que no puedo opinar de su funcionamiento.

10.12.2024

J**N

Solid brakes

Perfect fit. Works well. No issues at all. Installed on 77 K10

30.10.2025

C**I

Good quality

Good quality and price

28.08.2025

A**R

As Advertised

I used this on my 1976 Pontiac Astre, fit perfect.

13.09.2019

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

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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₨4502

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

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ASIN	B001DRNA1U
Best Sellers Rank	#6,520 in Automotive ( See Top 100 in Automotive ) #2 in Automobile Brake Primary Cylinders
Brand	ACDelco
Customer Reviews	4.6 4.6 out of 5 stars (799)
Date First Available	12 August 2012
Exterior	Machined
Item Weight	635 g
Item model number	18M1878
Manufacturer	ACDELCO
Manufacturer Part Number	19176488
Model	Brake Master Cylinder Assembly
OEM Part Number	19176488
Product Dimensions	23.88 x 14.73 x 12.19 cm; 635.03 g

Acdelco 18M1878 Professional Brake Master Cylinder Assembly

Description

Specifications

Reviews

Common Questions