Product: Inline brake check valve (accepts 3/824 inverted brake fitting) Key benefits Prevents backward flow of brake fluid to the master cylinder, helping maintain brake circuit stability. Holds a small residual pressure in the brake line so the system remains responsive and minimizes the need for extra pedal travel after initial application. Direct fit for common inverted brake fittings, simplifying installation on vehicles that use 3/824 brake connections. Important attributes Thread compatibility: Pipethreaded ends accept the common 3/824 inverted brake fitting. Function: Oneway/check valve design prevents flow to the master cylinder and maintains a small amount of pressure in the brake circuit. Application focus: Intended for use on modified vehicles, street rods, and custom builds where inverted 3/824 fittings are standard. Performance and fitment notes Designed to integrate into existing brake lines that use 3/824 inverted fittings without the need for adapters. Provides consistent oneway flow control to preserve braking readiness between applications. Typical use scenarios Installing or upgrading brake lines on a street rod that uses 3/824 inverted fittings and requires a residual/check valve. Custom hot rod or modified vehicle brake circuits where preventing fluid to the master cylinder improves pedal feel. Replacement of a worn or missing check valve during restoration of a classic or custom vehicle that uses standard inverted brake fittings. Compatibility reminder Fits brake systems using 3/824 inverted brake fittings and is commonly used in modified, street rod, and custom vehicle applications.