If you're converting an automatic 240SX to a manual transmission, the clutch hydraulic line is a critical part of the swap that often gets overlooked. The ISR Performance Auto to Manual Conversion Clutch Line is purpose-built for this exact swap and replaces the entire clutch hydraulic run with a single 52-inch braided stainless steel line. No piecing together OEM components, no smaller secondary line needed, just one direct line from master cylinder to slave.
What It Is
The ISR Auto to Manual Conversion Clutch Line is a 52-inch steel-braided clutch line designed specifically for 240SX auto-to-manual conversions. It uses a PTFE inner core, stainless steel braided cover, and a yellow PVC outer jacket for additional abrasion and corrosion protection. The line uses CNC machined fittings with permanently crimped-on zinc plated ends.
What It Does
When you convert a 240SX from automatic to manual transmission, you need to install a complete clutch hydraulic system. The factory automatic chassis doesn't have the hard lines or hydraulic plumbing needed to operate a clutch. The ISR clutch line replaces all of that with a single braided line that runs directly from the clutch master cylinder to the clutch slave cylinder, eliminating the need for any intermediate hard line sections.
The PTFE core and stainless steel braid construction reduce volumetric expansion under pressure compared to OEM rubber lines, which translates to a firmer, more consistent clutch pedal feel. There's less squish in the system when you press the pedal, so engagement is more predictable.
Why Braided Steel Over Rubber
OEM rubber clutch lines have known long-term failure modes. Under continuous use, rubber lines swell and expand, which causes spongy pedal feel and eventually fails. The rubber cover is also susceptible to ozone deterioration over time. In hard driving, autocross, or racing applications, rubber lines are vulnerable to damage from flying debris.
Braided stainless steel lines address all of these issues. The stainless braid resists physical damage from debris, the PTFE core won't swell under pressure, and the construction won't deteriorate from environmental exposure the way rubber does. The yellow PVC outer cover on this specific line adds another layer of abrasion and corrosion protection on top of the steel braid.
Smart Fitting Design
The ISR clutch line uses a separated fitting design where the fittings are installed independently from the line itself. Most braided clutch lines on the market force you to twist the entire line during installation as you thread the fittings, which can damage the line and is genuinely frustrating to work with. The ISR design lets you install the fitting first, then connect the line, so there's no twisting required.
Fitment and Compatibility
This clutch line fits the Nissan 240SX from 1989 to 1998 (S13 and S14 chassis). It's specifically designed for auto-to-manual transmission conversions on this platform. The 52-inch length covers the full run from master cylinder to slave cylinder.
Single Line Setup
This is a critical compatibility note: the smaller secondary clutch line is not needed with this setup. The ISR Auto to Manual Conversion Clutch Line is designed as a complete one-piece run from the master cylinder all the way to the slave cylinder. If you've seen build guides that reference using both a longer line and a shorter secondary line, that's for OEM-style hydraulic plumbing. The ISR conversion line replaces both with a single piece.
Who This Is For
This part is for one specific job: converting an automatic 240SX to manual transmission. If you're doing an auto-to-manual swap on an S13 or S14, you need a clutch hydraulic line, and this is purpose-built for that swap. If you're already running a manual 240SX and want to upgrade your clutch line, the standard ISR braided clutch line is the correct part, not this conversion line. The 52-inch length on this part is specific to the auto-to-manual swap and is longer than what a factory manual 240SX needs.
Installation Notes
Professional installation is recommended for full auto-to-manual conversions. The clutch line is one component of a complete swap that includes the manual transmission, clutch master cylinder, clutch slave cylinder, clutch and flywheel, pedal assembly, driveshaft, and ECU. After installation, the clutch hydraulic system needs to be properly bled to remove all air before the system will function correctly.
Product Details
Brand: ISR Performance
Product: Auto to Manual Conversion Clutch Line
Part Number: IS-240-411
Vehicle Fitment: Nissan 240SX 1989-1998 (S13 and S14)
Application: Auto-to-manual transmission conversion
Length: 52 inches
Construction: PTFE inner core, stainless steel braided cover, yellow PVC outer jacket
Fittings: CNC machined, permanently crimped, zinc plated steel
Routing: Master cylinder to slave cylinder (single-piece run)
Secondary Line Required: No, this replaces both factory line sections
Key Benefits: Purpose-built for auto-to-manual swaps, firmer clutch pedal feel, resistant to swelling and debris damage, separated fitting design for easier installation