---
title: "brake fluid cap — Niche Verdict: Skip it (46/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/brake-fluid-cap"
last_updated: "2026-07-15T03:01:56.632Z"
locale: en
meta:
  description: "prices mostly outside the sweet spot ($4.59–$16.31) — brake fluid cap doesn't clear our bar today."
  "og:description": "prices mostly outside the sweet spot ($4.59–$16.31) — brake fluid cap doesn't clear our bar today."
  "og:title": "brake fluid cap — Niche Verdict: Skip it (46/100) | Amazon United States - Flapen"
---

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# **brake fluid cap**

**Skip it**

Prices mostly outside the sweet spot ($4.59–$16.31) — this niche doesn't clear our bar today.

Market size 13Growth 21Conversion 68Competition 52Returns 19Price range 11Avg price 23Brand share 78Review moat 93Quality gap 98

**Quality gap**

**Incredible****3.7★**

avg incumbent rating — lower means beatable quality

**Review moat**

**Great****130.12**

avg incumbent reviews — the moat a new listing must climb

**Brand share**

**Great****57%**

top-5 brand share — no brand owns this niche

**Conversion**

**Good****6.1%**

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

**Competition**

**Good****54%**

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

**Avg price**

**Bad****$8.11**

avg listing price — sweet spot $15–$100

**Growth**

**Bad****-7.3%**

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

**Returns**

**Bad****7.4%**

return rate — above 6% kills the launch gate

**Market size**

**Bad****$53K**

$53K/yr · 106K searches

**Price range**

**Bad****$4.59–$16.31**

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

## **Competition**

The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**20 **▼falling

**Sellers**

**66**

**Top-5 brand share**

**57%**

**Open market**

**38%**

- QQWD30% - ESWW10% - Motorcraft6% - pvotawp6% - YUPIKJI5% - AUPARTIK5%

## **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%10%$5K20%$11K30%$16K40%$21K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

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

All 25 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Brake Fluid Cap Replacement OEM #4683656AB 5014518AA Brake Master Cylinder Cap Compatible with 2001-2017 Jeep Wrangler 2009-2020 Dodge Journey 2014-2020 Cherokee 2017-2020 Brake Fluid Reservoir Caps](https://m.media-amazon.com/images/I/41Tlbp0ockL.jpg)**Brake Fluid Cap Replacement OEM #4683656AB 5014518AA Brake Master Cylinder Cap Compatible with 2001-2017 Jeep Wrangler 2009-2020 Dodge Journey 2014-2020 Cherokee 2017-2020 Brake Fluid Reservoir Caps**QQWD**$6.85**2.5★134 rev](https://www.amazon.com/dp/B0FJF3CMSW) [2![ESWW Dot 3 Brake Fluid Cap Replacement 20760280 Brake Master Cylinder Reservoir Cap for Cadillac Escalade ESV Chevy Suburban Tahoe Silverado Volt GMC Yukon Sierra Acadia Canyon Buick Enclave Lucerne](https://m.media-amazon.com/images/I/31Q+S4+euHL.jpg)**ESWW Dot 3 Brake Fluid Cap Replacement 20760280 Brake Master Cylinder Reservoir Cap for Cadillac Escalade ESV Chevy Suburban Tahoe Silverado Volt GMC Yukon Sierra Acadia Canyon Buick Enclave Lucerne**ESWW**$9.25**4.6★24 rev](https://www.amazon.com/dp/B0GJRTZY6H) [3![PVOTAWP Brake Fluid Cap Replacement for Honda Brake Master Cylinder Tank Fluid Reservoir Cap Compatible with Honda Accord Fit EV Hybrid S2000 Accessories 46662-SLE-J01 46662-SDC-A02 46662-S8A-003](https://m.media-amazon.com/images/I/51n9cZ547bL.jpg)**PVOTAWP Brake Fluid Cap Replacement for Honda Brake Master Cylinder Tank Fluid Reservoir Cap Compatible with Honda Accord Fit EV Hybrid S2000 Accessories 46662-SLE-J01 46662-SDC-A02 46662-S8A-003**pvotawp**$8.38**4.5★127 rev](https://www.amazon.com/dp/B0DNS16W6F) [4![Brake Fluid Cap Replacement OEM#4683656AB Brake Master Cylinder Cap Compatible with Chrysler Sebring Dodge Ram 1500 2500 3500 Jeep Wrangler JK Standard Brake Reservoir Cap](https://m.media-amazon.com/images/I/41fQ-2FozqL.jpg)**Brake Fluid Cap Replacement OEM#4683656AB Brake Master Cylinder Cap Compatible with Chrysler Sebring Dodge Ram 1500 2500 3500 Jeep Wrangler JK Standard Brake Reservoir Cap**carleef**$5.52**4.7★81 rev](https://www.amazon.com/dp/B0D4TQML9Z) [5![Motorcraft - Cap - Filler (P) (BRFC21)](https://m.media-amazon.com/images/I/314T4XGJFML.jpg)**Motorcraft - Cap - Filler (P) (BRFC21)**Motorcraft**$16.31**4.7★89 rev](https://www.amazon.com/dp/B07Z8M1TH4)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![CouTunp Brake Fluid Cap Yellow Brake Master Cylinder Fluid Reservoir Cap Car Brake Master Cylinder Cap Compatible with Jeep Wrangler Compass Cherokee Chrysler Replaces 68303540AA 68211910AB](https://m.media-amazon.com/images/I/41+IWv5HziL.jpg)**CouTunp Brake Fluid Cap Yellow Brake Master Cylinder Fluid Reservoir Cap Car Brake Master Cylinder Cap Compatible with Jeep Wrangler Compass Cherokee Chrysler Replaces 68303540AA 68211910AB**CouTunp**$9.51**1 rev5mo ago](https://www.amazon.com/dp/B0GLNPQCRC) [![ESWW Dot 3 Brake Fluid Cap Replacement 20760280 Brake Master Cylinder Reservoir Cap for Cadillac Escalade ESV Chevy Suburban Tahoe Silverado Volt GMC Yukon Sierra Acadia Canyon Buick Enclave Lucerne](https://m.media-amazon.com/images/I/31Q+S4+euHL.jpg)**ESWW Dot 3 Brake Fluid Cap Replacement 20760280 Brake Master Cylinder Reservoir Cap for Cadillac Escalade ESV Chevy Suburban Tahoe Silverado Volt GMC Yukon Sierra Acadia Canyon Buick Enclave Lucerne**ESWW**$9.25**24 rev5mo ago](https://www.amazon.com/dp/B0GJRTZY6H) [![Brake Fluid Cap Brake Master Cylinder Cap Master Cylinder Tank Fluid Reservoir Cover Compatible with Honda Accord Fit EV Hybrid Replace OEM# 46662-SLE-J01 46662-SDC-A02 46662-S8A-003](https://m.media-amazon.com/images/I/41LDsr4NxiL.jpg)**Brake Fluid Cap Brake Master Cylinder Cap Master Cylinder Tank Fluid Reservoir Cover Compatible with Honda Accord Fit EV Hybrid Replace OEM# 46662-SLE-J01 46662-SDC-A02 46662-S8A-003**YUPIKJI**$7.59**3 rev5mo ago](https://www.amazon.com/dp/B0GHMVV4HP) [![JYIS 1PC Brake Master Cylinder Cap Cylinder Tank Reservoir Cap Replacement Replaces OEM# 46662-SLE-J01 46662-SDC-A02 46662-S8A-003 Car Brake Fluid Cap Accessories Compatible with Honda Accord CR-V](https://m.media-amazon.com/images/I/51fwzLGmrtL.jpg)**JYIS 1PC Brake Master Cylinder Cap Cylinder Tank Reservoir Cap Replacement Replaces OEM# 46662-SLE-J01 46662-SDC-A02 46662-S8A-003 Car Brake Fluid Cap Accessories Compatible with Honda Accord CR-V**JYIS**$6.32**7 rev6mo ago](https://www.amazon.com/dp/B0GFW655FV) [![Icyfond Brake Fluid Cap Brake Master Cylinder Reservoir Cap Brake Oil tank Cap OEM#68211910AB Compatible with Wrangler Cherokee Compass Chrysler Pacifica(Yellow)](https://m.media-amazon.com/images/I/41fv1qk073L.jpg)**Icyfond Brake Fluid Cap Brake Master Cylinder Reservoir Cap Brake Oil tank Cap OEM#68211910AB Compatible with Wrangler Cherokee Compass Chrysler Pacifica(Yellow)**Icyfond**$8.93**5 rev6mo ago](https://www.amazon.com/dp/B0GFMDPBZB)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![WZP Brake Fluid Cap Master Cylinder Fluid Cap with Built-in Rubber Sealing Ring Brake Reservoir Replacement Compatible with Honda Accord Replaces for 46662-SLE-J01 46662-SDC-A02 46662-S8A-003](https://m.media-amazon.com/images/I/41GPJoWEB2L.jpg)**WZP Brake Fluid Cap Master Cylinder Fluid Cap with Built-in Rubber Sealing Ring Brake Reservoir Replacement Compatible with Honda Accord Replaces for 46662-SLE-J01 46662-SDC-A02 46662-S8A-003**WZP**$6.59**1.8★**▲ 278%**](https://www.amazon.com/dp/B0G63HHCXV) [![CouTunp Brake Fluid Cap Yellow Brake Master Cylinder Fluid Reservoir Cap Car Brake Master Cylinder Cap Compatible with Jeep Wrangler Compass Cherokee Chrysler Replaces 68303540AA 68211910AB](https://m.media-amazon.com/images/I/41+IWv5HziL.jpg)**CouTunp Brake Fluid Cap Yellow Brake Master Cylinder Fluid Reservoir Cap Car Brake Master Cylinder Cap Compatible with Jeep Wrangler Compass Cherokee Chrysler Replaces 68303540AA 68211910AB**CouTunp**$9.51**1.0★**▲ 278%**](https://www.amazon.com/dp/B0GLNPQCRC) [![Icyfond Brake Fluid Cap Brake Master Cylinder Reservoir Cap Brake Oil tank Cap OEM#68211910AB Compatible with Wrangler Cherokee Compass Chrysler Pacifica(Yellow)](https://m.media-amazon.com/images/I/41fv1qk073L.jpg)**Icyfond Brake Fluid Cap Brake Master Cylinder Reservoir Cap Brake Oil tank Cap OEM#68211910AB Compatible with Wrangler Cherokee Compass Chrysler Pacifica(Yellow)**Icyfond**$8.93**4.0★**▲ 237%**](https://www.amazon.com/dp/B0GFMDPBZB) [![YUPIKJI Brake Fluid Cap Brake Reservoir Cap Master Cylinder Filler Caps Replace OEM #4683656AB 5014518AA Car Accessories Fluid Tank Reservoir Cover Compatible with Dodge Jeep Chrysler Ram Dakota](https://m.media-amazon.com/images/I/41M2Sj4Mq2L.jpg)**YUPIKJI Brake Fluid Cap Brake Reservoir Cap Master Cylinder Filler Caps Replace OEM #4683656AB 5014518AA Car Accessories Fluid Tank Reservoir Cover Compatible with Dodge Jeep Chrysler Ram Dakota**YUPIKJI**$6.11**3.9★**▲ 228%**](https://www.amazon.com/dp/B0GC3JPML8) [![ESWW Dot 3 Brake Fluid Cap Replacement 20760280 Brake Master Cylinder Reservoir Cap for Cadillac Escalade ESV Chevy Suburban Tahoe Silverado Volt GMC Yukon Sierra Acadia Canyon Buick Enclave Lucerne](https://m.media-amazon.com/images/I/31Q+S4+euHL.jpg)**ESWW Dot 3 Brake Fluid Cap Replacement 20760280 Brake Master Cylinder Reservoir Cap for Cadillac Escalade ESV Chevy Suburban Tahoe Silverado Volt GMC Yukon Sierra Acadia Canyon Buick Enclave Lucerne**ESWW**$9.25**4.6★**▲ 226%**](https://www.amazon.com/dp/B0GJRTZY6H)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — -7.3% search growth over the last 90 days.

2K2KSpike '25Prime Day '25 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**67%

*“Fit like it should”*

**Advertised Vs Actual Product**8%

*“Performs as it should”*

**Value For Money**6%

*“it's worth every penny”*

**Quality-Overall**6%

*“OEM-Quality Fit: It threaded on smoothly”*

**Efficiency**3%

*“Cap worked great”*

**Leak-Proof**2%

*“Does not leak”*

**Correct Contents**1%

*“The part was perfect”*

**Certifications**1%

*“A++ As good as factory - No compliants”*

**Durability**1%

*“Durable Build: The plastic feels thick, rugged, and heat-resistant, so I expect it to hold up well under under-hood temperatures for a long time”*

**Material Quality**0%

*“seems to be made of quality materials”*

### **What buyers complain about **

**Size-Overall**56%

*“DOES NOT FIT”*

**Compatibility-Overall**29%

*“Doesn't fit all cars”*

**Advertised Vs Actual Product**6%

*“Wrong description”*

**Leak-Proof**1%

*“If youre dealing with a leaking or damaged cap”*

**Portability**1%

*“Not universal”*

**Coolant**1%

*“Coolant cap cracked tightening it down on 2017 f250 super duty”*

**Filtration**1%

*“Didnt fit what they said it would I have a 2011 Mercedes 2500 sprinter van the filter said it would fit”*

**Quality-Overall**1%

*“It isn't even good quality”*

**Value For Money**0%

*“Waste of money- do not buy”*

**Natural Resource Wastage**0%

*“Waste of money”*

### **Top return reasons **

**Size-Overall**80%

**Compatibility-Overall**16%

**Advertised Vs Actual Product**4%

**Defective Material/Parts**2%

**Functionality-Overall**0%

**Value For Money**0%

**Shape/Style**0%

**Product Condition**0%

**Maintenance And Repair**0%

**Filtration**0%