Best Brake Line Fitting Kit for Mixed Brake-Line Repairs

#1 · Best Overall

1. Tnisesm 102-Piece Assortment

• Thread Size: 1/4
• Material: Brass
• Size: #3/8, #7/16, #1/2, #9/16
• Weight: 0.74 kg

Best for: Brass inverted-flare stock assortment.

Why it ranks #1: Covers 3/16-inch and 1/4-inch lines with several listed nut threads and unions, giving buyers a clearly detailed mixed-size inverted-fitting assortment.

A 102-piece brass assortment covers 3/16-inch and 1/4-inch brake line with inverted tube nuts and unions. Its counts concentrate on 3/8-24 nuts for 3/16-inch tubing and 7/16-24 nuts for 1/4-inch tubing, giving repair work a substantial supply of those listed combinations.

The kit pairs 42 3/16-inch nuts at 3/8-24 with 30 1/4-inch nuts at 7/16-24, then adds nuts in three other listed thread sizes and unions for both tube sizes. That distribution can be useful when those dominant thread combinations account for much of the work, while the assorted smaller counts provide alternatives. Brass construction and the included nut-and-union mix make it a focused stock assortment for inverted-flare connections.

Skip it if you need bubble/ISO flare fittings; The Stop Shop FK316 lists bubble/ISO as well as inverted-flare options for 3/16-inch line.

A fit for shops or home repairers stocking brass inverted-flare nuts and unions across two tube sizes, especially the listed 3/8-24 and 7/16-24 combinations. Choose another assortment when bubble/ISO fittings are required.

Listed on Amazon as: 102Pcs 3/16" & 1/4" Brake Line Fittings Assortment Kit,3/8 Inch-24 Threads Nuts and Unions,7/16Inch-24,1/2 Inch-20,9/16 Inch-18,7/16 Inch-24 Threads Nuts and Unions

#2 · Broad Thread Range

2. Ailbiuko 100-Piece Kit

• Thread Size: 3/16 inch
• Size: 3/16"+1/4"
• Weight: 0.78 kg

Best for: Mixed-size inverted-flare repairs.

Why it ranks #2: Includes fittings for both 3/16-inch and 1/4-inch lines, with listed 3/8-24, 7/16-24, 1/2-20, and 9/16-18 threads.

The 100-piece assortment covers both 3/16-inch and 1/4-inch brake line, giving repair work a broader mix of tube sizes and thread options in one box. Its listed nuts and unions span four thread sizes, helping stock a selection of common replacement connection pieces for mixed-size jobs.

For 3/16-inch tubing, the kit includes 40 nuts with 3/8-24 threads plus smaller counts in 7/16-24, 1/2-20, and 9/16-18. The 1/4-inch assortment adds 30 nuts at 7/16-24 and other listed thread sizes, along with unions for both tube sizes. That range can help when a repair calls for different inverted-flare connections, while the box keeps the 100 pieces together for selection and storage.

Skip it if you need bubble/ISO flare options; The Stop Shop FK316 lists both inverted and bubble/ISO fittings for 3/16-inch line.

A useful stock kit for someone handling inverted-flare repairs across both 3/16-inch and 1/4-inch tubing. Check the listed tube and thread sizes against the connection being repaired; this assortment does not list bubble/ISO flare fittings.

Listed on Amazon as: 100Pcs 3/16" 1/4" Brake Line Fittings Kit(Nut and Union)

#3 · Brass Mixed-Size Kit

3. GAGIRA 104-Piece Kit

• Thread Size: 0.25 inch
• Material: Brass
• Size: 3/16" and 1/4"

Best for: Brass fittings across two tube sizes.

Why it ranks #3: Combines 3/16-inch and 1/4-inch fittings with nuts, unions, and brass tee fittings; its listed material is brass.

Brass construction and coverage for both 3/16-inch and 1/4-inch tubing define this 104-piece kit. It combines brake-line nuts, unions, and brass tee fittings, enabling a repair setup that includes connection and branching hardware rather than nuts and unions alone.

The assortment lists 12 styles across two tubing sizes, with nuts and unions for joining brake-line sections and brass tees included for branching connections. GAGIRA states a working-pressure rating of 115 PSI and a temperature range from -22°F to 392°F, facts that help buyers assess the stated operating limits for their application. Its installation description calls for sliding the tubes through matching nuts before fastening the union, offering a clear basic connection sequence.

Skip it if you need a larger pressure rating; no other supplied kit lists a higher rating, so verify your application requirements before choosing this one.

Consider this kit when a brass assortment spanning two brake-line sizes and including tee fittings suits the repair. The listed pressure limit is 115 PSI, so check that stated rating against the requirements of the intended application.

Listed on Amazon as: 104Pcs Brake Line Fitting Kit

#4 · Metric and SAE Flare

4. Stop Shop 45-Fitting Assortment

• Thread Size: 2.5 in
• Material: Metal
• Size: 3/16 inch

Best for: Metric and SAE 3/16-inch work.

Why it ranks #4: Targets 3/16-inch tubing and lists both inverted-flare and bubble/ISO fittings, including SAE and metric thread options.

Both inverted-flare and bubble/ISO fittings appear in this 45-piece assortment, giving 3/16-inch brake-line repairs options across metric and SAE connections. The listed threads include several metric sizes alongside SAE inverted-flare sizes, which can help when identifying replacement fittings for varied connection standards.

The kit includes SAE inverted-flare sizes such as 3/8-24 and 7/16-24, plus metric 10×1 inverted-flare fittings. Its bubble/ISO selection includes 10×1, 11×1.5, 12×1, and 13×1.5, so both flare styles and multiple metric threads are represented for 3/16-inch line. The fittings are coated for corrosion resistance, a useful feature for hardware exposed to the conditions around brake-line service.

Skip it if you need fittings for 1/4-inch line; Ailbiuko BLF-mix-100pcs lists nuts and unions for both 3/16-inch and 1/4-inch tubing.

A fitting choice for repairs involving 3/16-inch line where metric and SAE threads or inverted and bubble/ISO flares may be needed. Its stated tube-size coverage is 3/16 inch, so it is not the pick for 1/4-inch line.

Listed on Amazon as: The Stop Shop Fitting Assortment for 3/16 Inch Brake Line Tubing, Inverted Flare & Bubble/ISO flare fittings, Metric & SAE (Pack of 45 fittings)

#5

5. Legines 70-Piece Kit

• Material: Metal
• Weight: 0.63 kg

Best for: Mixed flare and compression fitting needs.

Why it ranks #5: Includes inverted-flare nuts and unions for both 3/16-inch and 1/4-inch lines, plus listed compression fittings for each diameter.

This 70-piece Legines kit combines inverted-flare assortments for two tube sizes with separate compression fittings, enabling a wider range of listed connection types in one selection. Its short and long tube nuts add another choice for 3/16-inch and 1/4-inch line work.

For each tube size, the kit includes 10 short nuts, 10 long nuts, and 10 unions, making the inverted-flare contents evenly divided between 3/16-inch and 1/4-inch line. It also adds five compression fittings for each size. That mix can help organize supplies for jobs calling for different nut lengths or compression hardware, while keeping the fitting types and tube sizes represented in a single assortment.

Skip it if you need stated thread sizes before selecting fittings; Ailbiuko BLF-mix-100pcs lists specific thread options for its nuts and unions.

Consider this assortment when short and long nuts, unions, and compression fittings across two tube sizes match the work. Because the supplied details do not name thread sizes, verify the required connection specifications before use.

Listed on Amazon as: Brakeline fittings 3/16"and 1/4"nuts,unions,compression fittings kit 70 Pieces

#6 · Metric Bubble Flare

6. Stop Shop Metric Kit

• Material: Brass
• Size: 3/16" Bubble Flare-4 Sizes
• Weight: 16 oz

Best for: Metric bubble-flare 3/16-inch repairs.

Why it ranks #6: Specifically serves 3/16-inch bubble-flare work and lists four metric thread sizes: 10×1, 11×1.5, 12×1, and 13×1.5 mm.

Four metric thread sizes are collected for 3/16-inch bubble-flare tubing in this 16-fitting kit. With 10×1, 11×1.5, 12×1, and 13×1.5 mm options, it enables a targeted assortment for metric ISO/bubble flare connections rather than a broad mix of tube sizes and flare styles.

The Stop Shop lists four metric threads, covering 10×1, 11×1.5, 12×1, and 13×1.5 mm, across 16 fittings for 3/16-inch tube. That focused size range helps keep the selection relevant to metric bubble-flare repairs, while the fittings are coated for corrosion resistance. The listing also identifies brass as the material, giving buyers a specific material detail to consider when adding the fittings to maintenance stock.

Skip it if you need SAE inverted-flare fittings; The Stop Shop FK316 includes SAE inverted-flare sizes alongside metric and bubble/ISO options.

A focused choice for someone repairing 3/16-inch lines with metric ISO/bubble-flare connections in one of its four listed thread sizes. It does not list SAE inverted-flare fittings, so match the flare and thread requirements first.

Listed on Amazon as: The Stop Shop Metric Brake Line Fitting Kit for 3/16" Tube. (ISO/Bubble Flare)

#7

7. Stacool 24-Piece Kit

• Thread Size: 3/8
• Material: Brass
• Size: 0.63*0.53*0.37 inch
• Weight: 3.68 oz

Best for: Focused 3/16-inch 3/8-24 repairs.

Why it ranks #7: A focused option for 3/16-inch brake lines, with 16 nuts and 8 unions using the listed 3/8-24 thread.

Eight unions and 16 nuts share a single 3/8-24 thread specification in this 24-piece kit, focusing its contents on 3/16-inch brake-line connections. That concentrated mix enables straightforward stocking for joining lines and replacing fittings when the specified tube and thread combination matches the repair.

The kit is listed for 3/16-inch brake lines and 3/8-24 threads, with eight unions for connecting lines and 16 nuts for line-end fittings. Brass construction is described as wear-resistant and resistant to rust, supporting continued use in repair stock. The stated dimensions give buyers a way to compare the small fittings with the available connection space, while the compact count suits jobs centered on this one thread specification.

Skip it if you need several thread options in one kit; Ailbiuko BLF-mix-100pcs lists multiple thread sizes for 3/16-inch and 1/4-inch line.

Choose it for replacement or line-joining work when 3/16-inch tubing and 3/8-24 threads are the required combination. Its focused selection is less suited to repairs that call for other listed thread sizes.

Listed on Amazon as: 24PCS 3/8 Inch-24 Threads Brake Line Fittings,Include 8PCS Brake Line Unions+16PCS Nuts,Brake Line Fitting Kit Fit for 3/16 Inch Brake Lines Standard Car Accessories (24PCS)

#8

8. A-Team Performance 12-Piece Kit

• Thread Size: M12
• Material: Brass
• Size: M12
• Weight: 16 oz

Best for: Brass 3/16-inch line joining.

Why it ranks #8: Provides brass nuts and unions for most 3/16-inch lines, with 3/8-24 threads and four unions plus eight nuts.

Four brass unions and eight nuts form this 12-piece assortment, giving 3/16-inch brake-line work a compact supply of line-joining and tube-end hardware. The listed 3/8-24 thread and corrosion-resistant brass construction help define the connection type and material for selection.

A-Team Performance specifies compatibility with most 3/16-inch brake lines and lists 3/8-24 threads with a 24-pitch UNF thread style. The four unions are described as a way to join two 3/16-inch lines, while the eight nuts serve as fittings for 3/16-inch tube. Brass construction and a corrosion-resistant finish provide material details relevant to maintaining these connections in a repair assortment.

Skip it if you need several thread sizes in one assortment; Ailbiuko BLF-mix-100pcs lists multiple thread options for 3/16-inch and 1/4-inch line.

A compact option for joining or fitting 3/16-inch brake lines when 3/8-24 threads suit the connection. Its 12-piece mix centers on that single listed thread specification, so check the required connection details.

Listed on Amazon as: A-Team Performance Brake Line Fittings Assortment Kit – Brass Fittings & Auto Flaring Nuts – 3/8"-24 Threads & Female Brake Line Union – Coupler, Joiner & Coupling Hardware Kit – Pack of 12 Copper

#9

9. S.U.R. & R. BR316 Assortment

• Size: 3/16 inch
• Weight: 2.5 lb

Best for: 3/16-inch assortment for focused repairs.

Why it ranks #9: Its listed line size is 3/16 inch, but the supplied description gives no thread sizes, flare type, or component breakdown.

The S.U.R. & R. BR316 is specified for 3/16-inch brake line, making tube size its clearest selection guide. Its listing identifies it as a brake-line fitting assortment, a straightforward option to consider when maintaining a supply for repairs centered on that line size.

This listing identifies the BR316 as a 3/16-inch brake-line fitting assortment and gives its dimensions as 11 by 7.7 by 1.8 inches. Those details help a buyer judge whether the stated line size suits the repair and whether the assortment's listed dimensions work for storage. The supplied information does not break down the fitting types or thread sizes, so the line-size designation is the primary stated guide for selection.

Skip it if you need named thread sizes and fitting counts; The Stop Shop FK316 lists its 3/16-inch fitting types, threads, and total count.

This is a possible choice when the BR316's stated 3/16-inch line size matches the repair and its listed dimensions suit storage. The supplied details do not identify individual fitting types or thread sizes.

Listed on Amazon as: S.U.R. & R. BR316 3/16" Brake Line Fitting Assortment

#10

10. BILEKSU 80-Piece Kit

• Thread Size: 1/4 inch
• Material: Color-Coated Iron, Copper
• Size: 0.59*0.48*0.48 inch
• Weight: 1.76 oz

Best for: High-count 1/4-inch fittings stock.

Why it ranks #10: This assortment is limited to 1/4-inch fittings and three listed thread sizes, making it less versatile for common mixed-size repairs.

A count of 58 nuts in 7/16-24 makes this 80-piece assortment especially weighted toward that thread for 1/4-inch brake line. It also includes nuts in 1/2-20 and 9/16-18 plus 7/16-24 connectors, enabling a supply of several listed connection sizes.

The 74 nuts are divided among 7/16-24, 1/2-20, and 9/16-18 threads, while six 7/16-24 connectors complete the 80-piece set. This distribution gives the largest supply to the 7/16-24 size while retaining smaller quantities for the other listed threads. The nuts are color-coated iron and the connectors are copper, so the material distinction helps identify what the kit specifies for each component type.

Skip it if you need 3/16-inch fittings too; Tnisesm's 102-piece assortment lists nuts and unions for both 3/16-inch and 1/4-inch line.

A practical stock option for 1/4-inch line repairs that use the listed 7/16-24, 1/2-20, or 9/16-18 nuts. The connector count is six, and all are specified as 7/16-24.

Listed on Amazon as: 80PCS 1/4 Brake Line Fittings Includes 3 Types Threaded Parts