The Trickstuff DRT/MXA ASM Membrane Kit is the ideal solution for keeping your Direttissima and Maxima brakes at peak performance. Designed exclusively for these two high-end brake models, this maintenance kit ensures perfect sealing of the pump compensation reservoir and guarantees consistent and reliable lever feel, essential for demanding riders in enduro MTB, all-mountain and downhill.

Technical Overview

Trickstuff, a German manufacturer renowned for its ultra-high-performance and ultra-lightweight brakes, offers this replacement membrane kit specifically developed for the master cylinders of Direttissima and Maxima brakes. These brakes, among the most powerful and modulable on the market, use Bionol vegetable fluid (mineral oil) and require high-precision sealing components. The membrane plays a crucial role: it ensures volume compensation in the reservoir while maintaining seal integrity against pressure and temperature variations during intense braking.

Technical Highlights

• Exclusive DRT/MXA compatibility: Custom-designed for Trickstuff Direttissima and Maxima brakes, this kit fits perfectly to the pump reservoir and guarantees precise adjustment without leaks.
• Precision manufacturing: Membrane manufactured to Trickstuff's strict specifications in Germany, ensuring durable sealing and optimal chemical resistance to Bionol mineral oil.
• Minimal weight: At only 1 gram, this component respects Trickstuff's ultralight philosophy without compromising reliability.
• Simplified installation: The kit allows quick replacement without special tools — simply unscrew the reservoir cap, replace the worn membrane and close.
• Preventive maintenance: Regular membrane replacement ensures consistent lever feel, eliminates leak risks and extends the service life of your braking system.

Product Context: Direttissima and Maxima Brakes

The Trickstuff Direttissima (520 g per pair) and Maxima (540 g per pair) brakes represent the pinnacle of MTB braking technology. The Direttissima, with its 14/17 mm pistons and 4-piston C42 caliper, offers exceptional power-to-weight ratio for trail and enduro. The Maxima, gravity-oriented downhill version, uses the Direttissima master cylinder with a modified lever with greater mechanical advantage and an enlarged MXA caliper (16/17 mm pistons), delivering up to 25% additional power. Both models use a lever pivot on ball bearings for ultra-smooth feel, Goodridge braided hoses on the Maxima, and tool-free reach adjustment. These brakes use Bionol vegetable fluid (sunflower oil), requiring mineral oil compatible seals and membranes.

Use and Maintenance

This membrane kit is a regular service part recommended during each complete brake service or as soon as you notice fluid volume loss, spongy lever feel or leaks at the reservoir level. Membrane replacement is an integral part of preventive maintenance, just like changing piston seals (available in the separate "Seals & Piston DRT/MXA Pump Oil ASM" kit). Trickstuff offers a complete range of spare parts to ensure longevity of its premium braking systems: caliper seal kits, replacement pistons, reservoir caps, bleed screws and M4 bleed adapters. The Trickstuff philosophy is based on total serviceability: each component can be replaced individually, avoiding complete system replacement.

Detailed Specifications

• Manufacturer reference: BSNSDXXXN0000S
• International EAN: 4251189805474
• Compatible models: Trickstuff Direttissima (DRT) and Maxima (MXA) — all production years
• Fluid type: Bionol mineral oil / compatible with all mineral fluids
• Kit contents: 1 pump reservoir membrane
• Material: High-resistance elastomer compatible with mineral oil
• Unit weight: 1 g
• Manufacturing: Germany (Trickstuff GmbH, Pfaffenweiler)
• Warranty: According to Trickstuff conditions