---
product_id: 307149379
title: "4 Piston Hydraulic Brake Repair Parts Upgrade kit Ceramic Piston Perfect Substitute for Shimano Brake Caliper 4-Piston M640 M810 M820 M7120 M8020 M8120 M9120"
brand: "exnavi"
price: "1741457₫"
currency: VND
in_stock: true
reviews_count: 8
category: "Exnavi"
url: https://www.desertcart.vn/products/307149379-4-piston-hydraulic-brake-repair-parts-upgrade-kit-ceramic-piston
store_origin: VN
region: Vietnam
---

# 8-point turbofan airflow design 400°C+ heat resistance Automotive-grade phenolic resin 4 Piston Hydraulic Brake Repair Parts Upgrade kit Ceramic Piston Perfect Substitute for Shimano Brake Caliper 4-Piston M640 M810 M820 M7120 M8020 M8120 M9120

**Brand:** exnavi
**Price:** 1741457₫
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Upgrade your brakes, upgrade your ride — unstoppable stopping power!

## Quick Answers

- **What is this?** 4 Piston Hydraulic Brake Repair Parts Upgrade kit Ceramic Piston Perfect Substitute for Shimano Brake Caliper 4-Piston M640 M810 M820 M7120 M8020 M8120 M9120 by exnavi
- **How much does it cost?** 1741457₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/307149379-4-piston-hydraulic-brake-repair-parts-upgrade-kit-ceramic-piston)

## Best For

- exnavi enthusiasts

## Why This Product

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

## Key Features

- • **Perfect Shimano Fit:** Specifically engineered for Shimano MT420, MT520, M640, M7120, M810, M820, M8020, M8120, M9120 models—no compromises.
- • **Precision Cooling Tech:** Innovative 8-point turbofan airflow design maximizes heat dissipation, preventing brake fade on intense rides.
- • **Unmatched Heat Endurance:** Withstands scorching 400°C+ without faltering, keeping your brakes cool under pressure.
- • **Automotive-Grade Durability:** Crafted from phenolic resin used in motor cars, ensuring impact and aging resistance for long-lasting reliability.
- • **Leak-Proof & Crack-Resistant:** Say goodbye to fragile ceramic pistons and oil leaks with a robust, no-break design that keeps your ride safe.

## Overview

The EXNAVI 4 Piston Hydraulic Brake Repair Parts Upgrade Kit is a premium replacement for select Shimano 4-piston brake calipers, featuring automotive-grade phenolic resin pistons that resist heat beyond 400°C and prevent cracking or oil leakage. Designed with an 8-point turbofan airflow system, it ensures superior heat dissipation and durability, making it the ultimate fix for worn or fragile ceramic pistons.

## Description

Buy EXNAVI 4 Piston Hydraulic Brake Repair Parts Upgrade kit Ceramic Piston Perfect Substitute for Shimano Brake Caliper 4-Piston M640 M810 M820 M7120 M8020 M8120 M9120: Caliper Pistons - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Good brake piston kit - This Disc Brake Piston Kit works well and was very easy to install. But removing the old pistons was quite a challenge. Some came out easily and some were very hard work even with compressed air. But it was great to replace the old pistons and get my brakes to stop leaking mineral oil.
Review: Great replacement for cracked ceramic pistons - My Shimano Deore XT 4-piston calipers were starting to seize up on my rotor so I removed the pads to press the pistons back into the caliper body (see YouTube videos on this process). While pushing them in I could feel some grinding and realized the back side of the piston, inside the caliper, had broken. Shimano doesn’t sell the ceramic replacements so I bought AND some new calipers just in case. I figured if these replacements didn’t work, I would just replace the whole caliper. So now I have two brand new calipers sitting in boxes because these replacements work great. They come will all new seals. Once you remove the old pistons (see YouTube videos on this process), installing them is a breeze. And because they are not ceramic, I don’t have to worry about them breaking again in the future. If you’re handy, this is a great buy.

## Features

- Only suitable for Shimano MT420 MT520 M640 M6120 M7120 M810 M820 M8020 M8120 M9120, not applicable to other than these models
- Extreme environment tolerance: Working heat resistance is greater than 400 degrees Celsius, with heat insulation and heat resistance effect
- Top material safety guarantee: Automotive-grade brake synthetic phenolic resin，The same material standard as motor car , impact resistance, aging resistance, solves the fatal defect of traditional ceramic pistons that are fragile and cause oil leakage
- Turbofan airflow design with eight-point contact with the piston for better heat dissipation
- Strong and durable, no breaking or cracking, Solve the original brake ceramic breaking and oil leakage problem, No worries about oil leakage

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0915F8DP4 |
| Best Sellers Rank | #494,452 in Automotive ( See Top 100 in Automotive ) #13 in Automotive Replacement Brake Caliper Pistons |
| Brand Name | EXNAVI |
| Customer Reviews | 4.1 4.1 out of 5 stars (60) |
| Date First Available | March 26, 2021 |
| Item Dimensions LxWxH | 0.65 x 0.65 x 0.35 inches |
| Item Package Dimensions L x W x H | 4.17 x 1.77 x 0.35 inches |
| Item Weight | 0.01 Ounces |
| Manufacturer | EXNAVI |
| Material | phenolic |
| Package Weight | 0.01 Kilograms |
| Part Number | EX-2021CA1 |

## Images

![4 Piston Hydraulic Brake Repair Parts Upgrade kit Ceramic Piston Perfect Substitute for Shimano Brake Caliper 4-Piston M640 M810 M820 M7120 M8020 M8120 M9120 - Image 1](https://m.media-amazon.com/images/I/619qinA-CkL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good brake piston kit
*by S***E on November 22, 2025*

This Disc Brake Piston Kit works well and was very easy to install. But removing the old pistons was quite a challenge. Some came out easily and some were very hard work even with compressed air. But it was great to replace the old pistons and get my brakes to stop leaking mineral oil.

### ⭐⭐⭐⭐⭐ Great replacement for cracked ceramic pistons
*by P***Y on December 5, 2023*

My Shimano Deore XT 4-piston calipers were starting to seize up on my rotor so I removed the pads to press the pistons back into the caliper body (see YouTube videos on this process). While pushing them in I could feel some grinding and realized the back side of the piston, inside the caliper, had broken. Shimano doesn’t sell the ceramic replacements so I bought AND some new calipers just in case. I figured if these replacements didn’t work, I would just replace the whole caliper. So now I have two brand new calipers sitting in boxes because these replacements work great. They come will all new seals. Once you remove the old pistons (see YouTube videos on this process), installing them is a breeze. And because they are not ceramic, I don’t have to worry about them breaking again in the future. If you’re handy, this is a great buy.

### ⭐⭐⭐⭐⭐ Perfect!!!
*by S***A on August 11, 2022*

Common issue with Shimano brakes. Looks like they just don't care? This issue has been going on for a LONG time. I have a set of M9120 and when I replaced the hose due to it getting caught and it developed a hole. When bleeding, it was leaking between the piston and the caliper housing. Sure enough, it was cracked. Bought these to see if I can salvage the calipers. They were a perfect fit and has been working great. I cleaned my old calipers in a 99% rubbing alcohol bath then blown clean with compressed air. With the oe pistons removed, there was a lot of ceramic dust mixed in with the fluid. After cleaning and wetting the new pistons with shimano mineral oil, they slid in and bled just fine. Lever feels the same and it's been working great. Absolute life saver. Ordering another set for when the front goes out.

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-03*