SKU: LEEFT7909
UPC: 887753636102
MPN: FT7909
This LEED BRAKES fitting adapter (part FT7909) converts a 1/2-20 male inverted flare thread to a 3/8-24 female inverted flare thread, giving builders a clean way to mate components that use different brake line thread sizes. It's a common need on master cylinder swaps, proportioning valve installs, and disc brake conversions where the new part doesn't match the existing line. Machined from brass with a natural finish, this adapter handles standard 3/16-inch and 1/4-inch brake lines and slots into the wider range of brake fittings and adapters we stock for hot rod, truck, and street build projects.
The fitting is turned from brass, which resists corrosion in hydraulic brake service and seals well against repeated assembly and disassembly. The 1/2-20 male end and 3/8-24 female end both use inverted flare geometry, so they seat against matching flare seats rather than relying on thread sealant. That keeps the connection reliable under braking pressure. Brass also machines cleanly, so the threads run true and start without cross-threading when you're working in tight engine bay or chassis quarters. LEED BRAKES backs the part with a one-year warranty from the date of purchase. Note that running silicone-based brake fluid will void that warranty, so stick with the fluid type your master cylinder and lines are rated for.
Reach for this 1/2-20 to 3/8-24 adapter any time a master cylinder, proportioning valve, or wheel cylinder port doesn't match the thread on your existing line. It's a frequent fix during disc brake conversion kit installs, where the new hardware often runs a different fitting size than the factory plumbing. Buy a couple if you're routing multiple lines, since these are easy to lose track of mid-build. Pair it with our selection of brake lines and thread adapters to finish the hydraulic side of the project in one order.
It converts a 1/2-20 male inverted flare thread to a 3/8-24 female inverted flare thread. That lets you join brake components with mismatched thread sizes, such as a master cylinder port and an existing brake line, without re-flaring or replacing the line.
The inverted flare design is built for standard 3/16-inch and 1/4-inch steel brake lines, the common sizes used on master cylinders, proportioning valves, and wheel cylinders. The flare seats against a matching flare rather than relying on sealant.
It's machined from brass with a natural finish. Brass resists corrosion in hydraulic brake service, seals well against repeated assembly, and cuts clean threads that start without cross-threading in tight work areas.
LEED BRAKES covers this fitting for one year from the date of purchase. Running silicone-based brake fluid voids that warranty, so use the fluid type your master cylinder and brake lines are rated for.
Yes. Conversion kits often run thread sizes that differ from the factory plumbing, and this 1/2-20 to 3/8-24 adapter bridges that gap so you can connect new master cylinders and valves to your existing lines.
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