master cylinder
Worth a lookShows a thin review moat (153 avg reviews), but brand-locked demand (top 5 brands take 93% of clicks) keeps it on the watch list.
Review moat
Great152.7avg incumbent reviews — the moat a new listing must climb
Avg price
Great$53.48avg listing price — sweet spot $15–$100
Quality gap
Great4.3★avg incumbent rating — lower means beatable quality
Market size
Good$805K$805K/yr · 697K searches
Price range
Good$12.23–$136.28cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Good46%top-5 click share — leaders hold, buyers still browse
Growth
Okay+2.1%90-day search growth — must beat 0% to launch
Conversion
Okay2.2%search→purchase rate — share of searches ending in a sale
Returns
Bad7.4%return rate — above 6% kills the launch gate
Brand share
Bad93%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.
All 46 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Dorman M390259 Brake Master Cylinder Compatible with Select Models
Dorman$36.204.5★1,474 rev
Dorman M630031 Brake Master Cylinder Compatible with Select Cadillac/Chevrolet/GMC Models
Dorman$65.124.6★1,058 rev
Dorman M76162 Brake Master Cylinder Compatible with Select Models
Dorman$33.004.6★351 rev
Dorman M39634 Brake Master Cylinder Compatible with Select Ford Models
Dorman$38.494.5★508 rev
Dorman M39646 Brake Master Cylinder Compatible with Select Chevrolet/Dodge/GMC Models
Dorman$34.404.5★348 rev
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
Abliseoum$38.1834 rev
BESULEN Motorcycle Brake Pump 7/8 22mm Aluminum Alloy Handlebar Right Hand Brake Master Cylinder Lever Motorbike Replacement Accessories Universal for Motorbike Scooter
BESULEN$12.238 rev
QUALITY-BUILT Brake Master Cylinder with Reservoir NM4148 Compatible with 2004-2009 Ford/Lincoln (F-150 Lobo Mark LT)
Quality-Built$73.5419 rev
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$40.628 rev
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$47.4219 rev
Trending
90-day click momentumQUALITY-BUILT Brake Master Cylinder with Reservoir NM4148 Compatible with 2004-2009 Ford/Lincoln (F-150 Lobo Mark LT)
Quality-Built$73.544.0★
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$38.183.8★
BESULEN Motorcycle Brake Pump 7/8 22mm Aluminum Alloy Handlebar Right Hand Brake Master Cylinder Lever Motorbike Replacement Accessories Universal for Motorbike Scooter
BESULEN$12.233.3★
A-Premium Brake Master Cylinder with Reservoir and Cap Compatible with Chevrolet Vehicles - Impala Limited 2014-2016 Impala 2009-2013
A-Premium$52.263.8★
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$47.093.7★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +2.1% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Good fit”
“Great product feels well made”
“Easy to install”
“Worth the price”
“Works as it should”
“It isn't leaking”
“Works well”
“Very strong and easy to bleed and install”
“It's very durable”
“the plugs to make bench bleeding easy”
What buyers complain about
“Leaked right out of the box”
“not very well made”
“Did not fit my bars”
“does not build pressure”
“Does not fit a 2002 Chevrolet Blazer”
“it's broke from the beginning”
“Doesn't come with plastic tube line to bleed the master cylinder”
“I'll need a brake booster after this being that brake fluid is corrosive”
“Didn't work”
“Price is cheap that's why you get what you pay for”