GKTech - IN-LINE 5/8" master cylinder - FL-RR-58

Looking for a dependable and high-quality master cylinder for your motorsport or custom application? Check out the FLUX Master Cylinders range! The ultimate solution for braking performance

Crafted with durability in mind, FLUX master cylinders feature a black E-coating and high-pressure die-cast aluminum design, along with superior quality EPDM rubber seals.

You can trust in the safety and performance, as they're tested to SAE J1153_201202 standards. They're compatible with standard DOT 3, DOT 4, and DOT 5.1 Glycol ether based brake fluids, plus, they can be easily rebuilt with readily available rebuild kits!

- Engineered for performance
- Lifetime warranty against manufacturing defects

BORE SIZE	0.625 (5/8 in)
STROKE	1.25
ARTEA (in²)	0.31
VOLUME (cu in)	0.38
TYPE	Single outlet
OUTLETS	1
MATERIAL	Aluminium
FINISH	E-coating Black
RES TYPE	in-line
INLET	7/16-20
OUTLET	3/8-24
ROD THREAD	5/16-24
BOLT SPACING	2-14"

How do I know which size master cylinder to choose? Typically the 5/8 master cylinder is proven on an S/R/Z chassis running the single or two pot brakes, the lever feel with this master is balanced, having a longer more typical throw to gauge feel while still efficiently locking the rear brakes. The 3/4 master cylinder is larger, so when used in that same setup the lever feel will be more direct, firmer, and require less throw to lock the rear brakes. However, if you are running larger brakes/wheel tire setup then the standard two pot and 235 width tire and do require a bit more bite, we would suggest this master cylinder. Do FLUX Master Cylinders have warranty? Yes! All FLUX master cylinders have lifetime warranty. Are FLUX Master Cylinders rebuildable? Yes! Rebuild kits are available to ensure low cost and easy maintenance on all master cylinders. Do you offer other masters? We offer a wide range of FLUX masters to suit 3/4", 5/8", & 7/8" applications, available in both integral and in-line reservoir variants.  What type of flare do the FLUX master cylinders have? They have a SAE 45 degree flare which will work with both an inverted flare (single) and a double flare.