---
title: "master cylinder — Niche Verdict: Worth a look (51/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/master-cylinder"
last_updated: "2026-07-14T05:57:57.355Z"
locale: en
meta:
  description: "master cylinder shows a thin review moat (153 avg reviews), but brand-locked demand (top 5 brands take 93% of clicks) keeps it on the watch list."
  "og:description": "master cylinder shows a thin review moat (153 avg reviews), but brand-locked demand (top 5 brands take 93% of clicks) keeps it on the watch list."
  "og:title": "master cylinder — Niche Verdict: Worth a look (51/100) | Amazon United States - Flapen"
---

Back to Flapen home

# **master cylinder**

**Worth a look**

Shows a thin review moat (153 avg reviews), but brand-locked demand (top 5 brands take 93% of clicks) keeps it on the watch list.

Market size 73Growth 28Conversion 27Competition 64Returns 19Price range 69Avg price 92Brand share 16Review moat 92Quality gap 75

**Review moat**

**Great****152.7**

avg incumbent reviews — the moat a new listing must climb

**Avg price**

**Great****$53.48**

avg listing price — sweet spot $15–$100

**Quality gap**

**Great****4.3★**

avg incumbent rating — lower means beatable quality

**Market size**

**Good****$805K**

$805K/yr · 697K searches

**Price range**

**Good****$12.23–$136.28**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Competition**

**Good****46%**

top-5 click share — leaders hold, buyers still browse

**Growth**

**Okay****+2.1%**

90-day search growth — must beat 0% to launch

**Conversion**

**Okay****2.2%**

search→purchase rate — share of searches ending in a sale

**Returns**

**Bad****7.4%**

return rate — above 6% kills the launch gate

**Brand share**

**Bad****93%**

top-5 brand share — brand-locked demand

## **Competition**

The top 5 products take 46% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**10 **▲rising

**Sellers**

**70**

**Top-5 brand share**

**93%**

**Open market**

**5%**

- Dorman64% - A-Premium22% - Quality-Built3% - NewYall3% - Beck/Arnley2% - PHILTOP2% - Open — no brand owns it (4 brands, 5%)

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%5%$40K10%$81K15%$121K20%$161K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 46 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Dorman M390259 Brake Master Cylinder Compatible with Select Models](https://m.media-amazon.com/images/I/41uaNi4RZ1L.jpg)**Dorman M390259 Brake Master Cylinder Compatible with Select Models**Dorman**$36.20**4.5★1,474 rev](https://www.amazon.com/dp/B001PYRLAM) [2![Dorman M630031 Brake Master Cylinder Compatible with Select Cadillac/Chevrolet/GMC Models](https://m.media-amazon.com/images/I/41ILUEGvU8L.jpg)**Dorman M630031 Brake Master Cylinder Compatible with Select Cadillac/Chevrolet/GMC Models**Dorman**$65.12**4.6★1,058 rev](https://www.amazon.com/dp/B001PYTM7C) [3![Dorman M76162 Brake Master Cylinder Compatible with Select Models](https://m.media-amazon.com/images/I/51o1p+Le3WL.jpg)**Dorman M76162 Brake Master Cylinder Compatible with Select Models**Dorman**$33.00**4.6★351 rev](https://www.amazon.com/dp/B000UIQA8I) [4![Dorman M39634 Brake Master Cylinder Compatible with Select Ford Models](https://m.media-amazon.com/images/I/41Ko3C8ZN7L.jpg)**Dorman M39634 Brake Master Cylinder Compatible with Select Ford Models**Dorman**$38.49**4.5★508 rev](https://www.amazon.com/dp/B001PYNZ16) [5![Dorman M39646 Brake Master Cylinder Compatible with Select Chevrolet/Dodge/GMC Models](https://m.media-amazon.com/images/I/41J2zT8iV1L.jpg)**Dorman M39646 Brake Master Cylinder Compatible with Select Chevrolet/Dodge/GMC Models**Dorman**$34.40**4.5★348 rev](https://www.amazon.com/dp/B001PYTL28)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![Brake Master Cylinder fit for Chevrolet Silverado Suburbaan fit for GMC Yukon Xl 1500 2500 1999-2002 Compatible with Cadillac Escalade 18060789 390541 F1406773 19209249 M630031](https://m.media-amazon.com/images/I/31eYqZB8P6L.jpg)**Brake Master Cylinder fit for Chevrolet Silverado Suburbaan fit for GMC Yukon Xl 1500 2500 1999-2002 Compatible with Cadillac Escalade 18060789 390541 F1406773 19209249 M630031**Abliseoum**$38.18**34 rev8mo ago](https://www.amazon.com/dp/B0FXGT9QDP) [![BESULEN Motorcycle Brake Pump 7/8 22mm Aluminum Alloy Handlebar Right Hand Brake Master Cylinder Lever Motorbike Replacement Accessories Universal for Motorbike Scooter](https://m.media-amazon.com/images/I/31wf7a4SxzL.jpg)**BESULEN Motorcycle Brake Pump 7/8 22mm Aluminum Alloy Handlebar Right Hand Brake Master Cylinder Lever Motorbike Replacement Accessories Universal for Motorbike Scooter**BESULEN**$12.23**8 rev11mo ago](https://www.amazon.com/dp/B0FLPKVFJJ) [![QUALITY-BUILT Brake Master Cylinder with Reservoir NM4148 Compatible with 2004-2009 Ford/Lincoln (F-150 Lobo Mark LT)](https://m.media-amazon.com/images/I/41LoPMwdL0L.jpg)**QUALITY-BUILT Brake Master Cylinder with Reservoir NM4148 Compatible with 2004-2009 Ford/Lincoln (F-150 Lobo Mark LT)**Quality-Built**$73.54**19 rev1y ago](https://www.amazon.com/dp/B0BWNVN4KH) [![QUALITY-BUILT Brake Master Cylinder Reservoir R25536 Compatible with 1988-2000 Chevrolet/Dodge/GMC (Blazer C1500 C1500 Suburban C2500 C2500 Suburban C3500 Jimmy K1500 K1500 Suburban K2500)](https://m.media-amazon.com/images/I/31m1+IXVY3L.jpg)**QUALITY-BUILT Brake Master Cylinder Reservoir R25536 Compatible with 1988-2000 Chevrolet/Dodge/GMC (Blazer C1500 C1500 Suburban C2500 C2500 Suburban C3500 Jimmy K1500 K1500 Suburban K2500)**Quality-Built**$40.62**8 rev1y ago](https://www.amazon.com/dp/B0FGGF1CGX) [![QUALITY-BUILT Brake Master Cylinder with Reservoir NM1854 Compatible with 1977-1986 Ford (Bronco E-100 Econoline E-100 Econoline Club Wagon E-150 Econoline E-150 Econoline Club Wagon F-100 F-150)](https://m.media-amazon.com/images/I/41LoPMwdL0L.jpg)**QUALITY-BUILT Brake Master Cylinder with Reservoir NM1854 Compatible with 1977-1986 Ford (Bronco E-100 Econoline E-100 Econoline Club Wagon E-150 Econoline E-150 Econoline Club Wagon F-100 F-150)**Quality-Built**$47.42**19 rev1y ago](https://www.amazon.com/dp/B0BWNXYDWY)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![QUALITY-BUILT Brake Master Cylinder with Reservoir NM4148 Compatible with 2004-2009 Ford/Lincoln (F-150 Lobo Mark LT)](https://m.media-amazon.com/images/I/41LoPMwdL0L.jpg)**QUALITY-BUILT Brake Master Cylinder with Reservoir NM4148 Compatible with 2004-2009 Ford/Lincoln (F-150 Lobo Mark LT)**Quality-Built**$73.54**4.0★**▲ 209%**](https://www.amazon.com/dp/B0BWNVN4KH) [![Brake Master Cylinder fit for Chevrolet Silverado Suburbaan fit for GMC Yukon Xl 1500 2500 1999-2002 Compatible with Cadillac Escalade 18060789 390541 F1406773 19209249 M630031](https://m.media-amazon.com/images/I/31eYqZB8P6L.jpg)**Brake Master Cylinder fit for Chevrolet Silverado Suburbaan fit for GMC Yukon Xl 1500 2500 1999-2002 Compatible with Cadillac Escalade 18060789 390541 F1406773 19209249 M630031**Abliseoum**$38.18**3.8★**▲ 155%**](https://www.amazon.com/dp/B0FXGT9QDP) [![BESULEN Motorcycle Brake Pump 7/8 22mm Aluminum Alloy Handlebar Right Hand Brake Master Cylinder Lever Motorbike Replacement Accessories Universal for Motorbike Scooter](https://m.media-amazon.com/images/I/31wf7a4SxzL.jpg)**BESULEN Motorcycle Brake Pump 7/8 22mm Aluminum Alloy Handlebar Right Hand Brake Master Cylinder Lever Motorbike Replacement Accessories Universal for Motorbike Scooter**BESULEN**$12.23**3.3★**▲ 75%**](https://www.amazon.com/dp/B0FLPKVFJJ) [![A-Premium Brake Master Cylinder with Reservoir and Cap Compatible with Chevrolet Vehicles - Impala Limited 2014-2016 Impala 2009-2013](https://m.media-amazon.com/images/I/41O-d4kj39L.jpg)**A-Premium Brake Master Cylinder with Reservoir and Cap Compatible with Chevrolet Vehicles - Impala Limited 2014-2016 Impala 2009-2013**A-Premium**$52.26**3.8★**▲ 50%**](https://www.amazon.com/dp/B0BLYRPZH9) [![PHILTOP M630334 Brake Master Cylinder Assembly Replacement for Chevrolet Silverado 1500/GMC Sierra 1500 2003-2005 2007 Silverado 2500 HD 2003-2006/GMC Sierra 2500 HD Chevrolet Express 3500 2003-2007](https://m.media-amazon.com/images/I/31hmB3cvUeL.jpg)**PHILTOP M630334 Brake Master Cylinder Assembly Replacement for Chevrolet Silverado 1500/GMC Sierra 1500 2003-2005 2007 Silverado 2500 HD 2003-2006/GMC Sierra 2500 HD Chevrolet Express 3500 2003-2007**PHILTOP**$47.09**3.7★**▲ 48%**](https://www.amazon.com/dp/B0DN1CSJ7Y)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — +2.1% search growth over the last 90 days.

15K10K seasonSepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.3×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Size-Overall**27%

*“Good fit”*

**Quality-Overall**21%

*“Great product feels well made”*

**Assembly/Installation**12%

*“Easy to install”*

**Value For Money**8%

*“Worth the price”*

**Advertised Vs Actual Product**8%

*“Works as it should”*

**Leak-Proof**6%

*“It isn't leaking”*

**Efficiency**5%

*“Works well”*

**Strength**2%

*“Very strong and easy to bleed and install”*

**Durability**1%

*“It's very durable”*

**Socket/Port/Plug**1%

*“the plugs to make bench bleeding easy”*

### **What buyers complain about **

**Leak-Proof**13%

*“Leaked right out of the box”*

**Quality-Overall**10%

*“not very well made”*

**Size-Overall**9%

*“Did not fit my bars”*

**Pressure**8%

*“does not build pressure”*

**Compatibility-Overall**8%

*“Does not fit a 2002 Chevrolet Blazer”*

**Durability**6%

*“it's broke from the beginning”*

**Defective Material/Parts**5%

*“Doesn't come with plastic tube line to bleed the master cylinder”*

**Rusts/Corrodes**5%

*“I'll need a brake booster after this being that brake fluid is corrosive”*

**Functionality-Overall**3%

*“Didn't work”*

**Value For Money**3%

*“Price is cheap that's why you get what you pay for”*

### **Top return reasons **

**Size-Overall**31%

**Compatibility-Overall**13%

**Defective Material/Parts**11%

**Leak-Proof**10%

**Functionality-Overall**7%

**Advertised Vs Actual Product**7%

**Pressure**4%

**Mechanism Issues**4%

**Value For Money**2%

**Mounting**2%