SAE Brake Line Fitting Size Gauge
Save time and eliminate guesswork on every brake-line installation with the 4LifetimeLines® Brake Line Fitting Size Gauge. Machined from anodized aluminum, this pocket-sized tool lets you instantly verify SAE brake-line fitting diameters—3/16″, 1/4″, #3 bubble and #4 bubble—so you always select the correct nut, union, or adapter without trial and error.
Why You Need a Fitting Gauge
Mismatched fittings can lead to leaks, cross-threading, and costly rework. Instead of measuring with calipers or carrying a drawerful of adapters, simply slide each fitting into its corresponding slot on this gauge. A firm “click” confirms the match, ensuring that your flare fittings, unions, and block adapters thread on perfectly every time. This single tool brings precision and confidence to professional shops and DIY garages alike.
Key Benefits
Instant Fit Verification
Four precisely milled holes check 3/16″ and 1/4″ inverted or double-flare lines plus #3 and #4 bubble fittings.
Durable Construction
Anodized-aluminum body resists corrosion, stays straight, and won’t deform under shop conditions.
Pocket-Sized Convenience
Slip it into your tool pouch or mount it on a key ring for instant access wherever you work.
Engraved Markings
Laser-etched size labels remain legible even after years of grease, brake fluid, and grime exposure.
Universal Compatibility
Works with steel, copper-nickel, and stainless-steel brake lines and fittings—no exceptions.
How to Use
Slide the flare end or bubble nut into each gauge opening until you find a snug fit. Match the engraving to confirm the size, then select the corresponding fitting from your kit. This quick check prevents mismatches before you tighten, saving expensive lines and shop time.
Ready to stop guessing and start building right? Add the Brake Line Fitting Size Gauge to your cart today and ensure flawless brake-line assemblies on every job.
