The SimNet Hydro-link Pro Kit (A-HPK) brings true hydraulic resistance and modulation to your simracing brake system by using a compact master cylinder + slave cylinder hydro body, combined with a tunable two-stage stack. Designed to integrate with SimNet SP Pro Load Cell pedals and the SimNet Load Cell handbrake, it lets you shape pedal feel from soft initial bite to firm lock-up for a more realistic cockpit.
 
Main Features
Real hydraulic brake feel: feel the direct resistance of hydraulic fluid as you apply pressure.
Hydro body with Master Cylinder + Slave Cylinder design for realistic modulation.
Two-stage brake design: mix and match springs and elastomers to build your ideal resistance curve.
Multiple stack configurations: one spring, two springs, spring + elastomer, or two elastomers.
Wide tuning range using different spring rates and elastomer hardness levels.
Preload adjustment via the slave cylinder cap for consistent pedal feel.
Includes dedicated mounting plates for pedals and handbrake for a clean cockpit install.
Built for advanced simracing control and repeatable inputs in competitive driving.
 
Technical Specifications
Product Type: Hydraulic link / brake feel upgrade kit (hydro module + tunable stack)
Hydraulic Module: Master Cylinder + Slave Cylinder (upright installation)
Tuning Concept: Two-stage stack (springs + elastomers)
Spring Options Included (rate / length): 32 kg, 54 kg, 78 kg, 116 kg in 55 mm and 25 mm
Elastomers Included: 70A and 80A (with an extra piece of each type included)
Spacer Set Included (for stack building): Spacer A (Convex-Convex), B (Convex-Flat), C (Convex-Concave), D (Concave-Flat), E (Concave-Concave)
Initial Setup Guidance: slave cylinder cap to maximum preload (5 mm position) before first use or after stack changes

 
Important notices (use & maintenance):
Do not operate the A-HPK repeatedly without a proper stack/load installed. The kit is supplied without a stack/load pre-installed.
If the slave cylinder piston gradually extends outward during empty operation, press the piston back by hand into its original position.
Upright installation only. Do not install or use in an inverted (upside-down) position.
On first use or after changing stacks, set the slave cylinder cap to maximum preload (5 mm position) to ensure the piston is fully seated.
Keep the slave cylinder clean and free from dust/debris for smooth operation and long service life.
Elastomers are consumable parts (wear items) and are not covered under warranty.
 
What’s in the Box
Hydro body (Master Cylinder + Slave Cylinder assembly)
Metal plates for pedals (mounting set)
Metal plates for handbrake (mounting set)
70A elastomers (set) + 80A elastomers (set) (includes one extra piece of each type)
Spring sets: 32 kg / 54 kg / 78 kg / 116 kg in 55 mm and 25 mm lengths
Spacer set for stack configurations: A / B / C / D / E
Tool kit: 2× Allen keys, mounting bolts, aluminum standoffs, and installation bushings/washers
 
Compatibility & Accessories
Compatible with: SimNet SP Pro Load Cell pedals and SimNet SHB-100 Load Cell handbrake.