EMPI Brass Brake Line Plugs, M10 x 1.0 Bubble Flare, Pair | VW Dune Buggy, Sand Rail & Master Cylinder (18-1103-0)
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EMPI 18-1103-0 brake line plugs are a pair of solid brass, male-threaded M10 x 1.0 plugs with a bubble flare (ISO) seat. They seal an unused M10 x 1.0 brake port — usually a spare master cylinder outlet on a dune buggy, sand rail or Baja Bug, or a spare outlet on a brake tee or junction block on any air-cooled VW. Sold as a pair.
Part numbers: EMPI 18-1103-0 · 18-1103 · C13-18-1103 · UPC 707924467796
Fitment
| Years | Vehicle | Notes |
|---|---|---|
| All | Dune buggies, sand rails, Baja Bugs on VW running gear | M10 x 1.0 bubble flare ports |
| All | VW Beetle, Super Beetle, Karmann Ghia, Type 2 Bus, Type 3, Thing | Master cylinders, tees and junction blocks with M10 x 1.0 ports |
| All | Off-road and custom builds | M10 x 1.0 master cylinders such as EMPI buggy master cylinders |
| Does not fit | SAE inverted-flare ports | 3/8"-24 or 7/16"-24 threads, used on many American master cylinders |
| Does not fit | M12 x 1.0 ports | Larger thread |
These plugs fit by thread and seat type, not by vehicle. If you're not sure what your port is, send us a photo and we'll confirm it.
Specifications
| Spec | Detail |
|---|---|
| Brand | EMPI |
| Part number | 18-1103-0 (also listed as 18-1103) |
| UPC | 707924467796 |
| Thread | M10 x 1.0 male |
| Seat type | Bubble flare (ISO / DIN) |
| Material | Brass |
| Sold as | Pair (2 plugs) |
| Shipping weight | 0.1 lb |
| Package dimensions | 1.5 x 1 x 0.75 in |
| Condition | New, aftermarket |
What's Included
- Two (2) M10 x 1.0 bubble flare brake line plugs. No other hardware is included or needed.
Why It Matters
The bubble flare seat seals metal to metal on the port's seat, just like a flared brake line fitting, so the plug seals the way the system was designed to. Brass won't rust and won't gall the port threads, and a pair covers both spare outlets on a typical buggy master cylinder.
Installation Notes
Clean the port's threads and seat before fitting. Grit on the seat is the most common cause of a weep.
Thread the plug in by hand first to make sure it isn't cross-threaded, then snug it with a flare-nut (line) wrench. Don't over-tighten; brass is softer than steel.
Don't use thread sealant or PTFE tape. The flare seat does the sealing, and tape can end up in the brake fluid.
Bleed the brakes after any change to the hydraulic system, then pressure-test with a firm pedal and check the plug for leaks before driving.
Plugging a port changes how your brake circuit works. Make sure the circuits that are left still brake the wheels you need them to.
Frequently Asked Questions
What are brake line plugs used for?
They seal a brake port you're no longer using, usually a spare outlet on a dune buggy or sand rail master cylinder, or an unused outlet on a brake tee or junction block.
What thread size are the EMPI 18-1103-0 brake line plugs?
M10 x 1.0 metric with a bubble flare seat, the standard brake port thread on air-cooled Volkswagens.
Will they fit an American master cylinder?
Only if its ports are M10 x 1.0 bubble flare. Most American master cylinders use SAE inverted-flare ports (3/8-24 or 7/16-24), and these plugs won't seal those.
Do I need thread tape or sealant on brake line plugs?
No. The bubble flare seat makes a metal-to-metal seal. Tape or sealant can contaminate the brake fluid.
How many plugs come in the package?
Two. They're sold as a pair, in brass.
Do I need to bleed the brakes after installing them?
Yes. Bleed the system after any change to the brake plumbing, then check for leaks with a firm pedal before driving.
Related Categories
EMPI Parts · All Air-Cooled VW
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
