Description

Brass Brake Pipe 4-Way Connector M10 x 1mm Female

Solid brass 4-way brake pipe connector with four M10 x 1mm female ports, for 3/16″ (4.75mm) pipe with M10 x 1 male unions. Feeds one line to three outlets – kit cars, race and rally builds, and brake light switch or gauge take-offs. Supplied by EMS Spares, Leicester – over 30 years in automotive components.

Specification

* Reference numbers are for identification and cross-reference only. EMS Spares is an independent UK supplier and has no connection with the owners of these part numbers. All dimensions are approximate.

Buyer’s guide: multi-way brake connectors explained

What does a 4-way connector do?

A multi-way brake pipe connector splits one brake pipe into several – for example front-to-rear splits, dual circuits, or adding a brake light switch or pressure gauge. Each port takes a male union on a flared pipe, which seals against the seat inside the port.

Step 1 – identify your thread (the most common mistake)

Tip: M10 x 1 and 3/8″ UNF look almost the same and will start to screw together, then bind. M10 x 1 and M10 x 1.25 also look alike. Never force a fitting. Measure the male thread (10mm = M10, 9.5mm = 3/8″) and check the pitch with a thread gauge.

Step 2 – ports and unions

• Female ports (this part): each port takes a male M10 x 1 union – see our EMS-A2 (long) and EMS-A2s (short).
• Only need three ways? Use our EMS-A32 T-piece, or blank the spare port with our EMS-A2D plug.

Step 3 – pipe size and flare

For 3/16″ (4.75mm) outside-diameter pipe, the standard UK car brake pipe size. Suits copper-nickel (Kunifer), copper and steel brake pipe. Match the flare on your pipe to the port it screws into – most metric ports take a DIN (inverted) or ISO bubble flare; if in doubt, copy the flare on your old pipe.

How to fit – good practice

1. Clean the ports and check each seat is free of dirt.
2. Start every union by hand for several turns – it should turn freely. If it binds, stop and check the thread.
3. Hold the fitting with one spanner while you tighten each union with a split / flare nut spanner, so the fitting does not twist or load the pipes.
4. Clip the fitting or pipes securely so they cannot vibrate.
5. Bleed the brakes, then check every joint for leaks with the pedal pressed hard.

Safety: brakes are a safety-critical system. If you are not confident, have the work done or checked by a qualified mechanic.

Pack sizes

Available as a single connector.

Delivery

Free UK delivery on every order (including Northern Ireland, Highlands & Islands). Same-day dispatch on orders placed before 10am.

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FAQ

Will this fit copper (Kunifer) pipe? Yes – any 3/16″ (4.75mm) brake pipe: copper-nickel, copper or steel.

Is M10 x 1 the same as 3/8″ UNF? No. They are close in size (10mm against 9.5mm) but the threads are different and will bind. They are not interchangeable.

Why brass and not steel? Brass does not rust or seize, so fittings can be undone again years later.

Which unions do I need? Four male M10 x 1 unions – EMS-A2 (long) or EMS-A2s (short).

Need help? Message us with your vehicle and the part you are connecting to and we will confirm the right fitting before you order.