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.Customs & duties included in the price

Help Track order

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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.

Specifications

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

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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.

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Acdelco 18M1878 Professional Brake Master Cylinder Assembly

Description

Specifications

Common Questions