---
product_id: 443668600
title: "ACDelco 18M1878 Professional Brake Master Cylinder Assembly"
brand: "acdelco"
price: "$469.48"
currency: USD
in_stock: true
url: https://www.desertcart.ec/products/443668600-acdelco-18m1878-professional-brake-master-cylinder-assembly
store_origin: EC
region: Ecuador
---

# Geometrical tolerance Pressure tested Cast iron & aluminum ACDelco 18M1878 Professional Brake Master Cylinder Assembly

**Brand:** acdelco
**Price:** $469.48
**Availability:** ✅ In Stock

## Summary

> 🚗 Drive with Confidence: Your Safety is Our Priority!

## Quick Answers

- **What is this?** ACDelco 18M1878 Professional Brake Master Cylinder Assembly by acdelco
- **How much does it cost?** $469.48 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/443668600-acdelco-18m1878-professional-brake-master-cylinder-assembly)

## Best For

- acdelco enthusiasts

## Why This Product

- Trusted acdelco brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Perfect Fit:** Geometrical tolerance ensures seamless integration with your vehicle.
- • **Safety First:** Pressure tested for safe and confident braking every time.
- • **Durable Design:** Crafted from cast iron and aluminum to minimize stress on mounting.
- • **Brake Drag Prevention:** Innovative piston assembly and return spring reduce premature wear.
- • **Unmatched Reliability:** Meets SAE J1153 & J1154 standards for top-notch performance.

## Overview

The ACDelco 18M1878 Professional Brake Master Cylinder Assembly is engineered to meet rigorous SAE J1153 and J1154 performance standards, ensuring reliability and safety. With a robust design featuring cast iron and aluminum, this assembly minimizes stress on brake boosting mounts while its geometrical tolerance guarantees a perfect fit. The pressure-tested unit includes a piston assembly and return spring to prevent brake drag, extending the life of your brake pads.

## Description

ACDelco 18M1878 Professional Brake Master Cylinder Assembly

## Features

- Meets the brake performance requirements of SAE J1153 and J1154 testing, providing reliability and quality
- Pressure tested to ensure safe and confident braking. Style: With Rectangular Reservoir Cap
- Cast iron and aluminum specifications; no extra stress on the brake boosting mounting
- Geometrical tolerance ensures that the body and plastic reservoir match for a proper fit
- Piston assembly and return spring help to prevent brake drag, which can cause premature brake pad wear
- Pressure tested to ensure safe and confident braking
- Cast iron and aluminum specifications provide no extra stress on the brake boosting mounting

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | ACDelco |
| Brand | ACDelco |
| Product Dimensions | 23.88 x 14.73 x 12.19 cm; 635.03 Grams |
| Item model number | 18M1878 |
| Manufacturer Part Number | 18M1878 |
| OEM Part Number | 19176488 |
| Volume | 262 Cubic Inches |
| Manufacturer | ACDelco |
| Country of Origin | USA |
| Item Weight | 635 g |

## Images

![ACDelco 18M1878 Professional Brake Master Cylinder Assembly - Image 1](https://m.media-amazon.com/images/I/71PIG9PlFNL.jpg)
![ACDelco 18M1878 Professional Brake Master Cylinder Assembly - Image 2](https://m.media-amazon.com/images/I/71DZ9BZ0leL.jpg)
![ACDelco 18M1878 Professional Brake Master Cylinder Assembly - Image 3](https://m.media-amazon.com/images/I/71h4Me2FoSL.jpg)
![ACDelco 18M1878 Professional Brake Master Cylinder Assembly - Image 4](https://m.media-amazon.com/images/I/71guyhCcGfL.jpg)
![ACDelco 18M1878 Professional Brake Master Cylinder Assembly - Image 5](https://m.media-amazon.com/images/I/71zRSvFLbwL.jpg)

## Questions & Answers

**Q: Why do brakes need to be replaced in the first place?**
A: 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.

**Q: What’s the squealing sound I hear when braking?**
A: 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.

**Q: What if it’s more of a grinding sound?**
A: 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.

**Q: Why do the brakes seem to pulsate when stopping?**
A: 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.

**Q: What about vibrations or shaking in the steering wheel?**
A: 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.

## Frequently Bought Together

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-03-10*