On a 22SRR pump, you find O-rings at different locations (tank hose entrance, fill cap, sometimes as guiding joints).
The most important point: The material. The seals used in hydraulic braking must imperatively be in EPDM (ethylene-propylene).
The danger: If you are using a "standard" O-ring (often in NBR / black nitrile bought in DIY store), it will swell, disintegrate and pollute your circuit in less than a few hours in contact with the Brake fluid DOT 4 /5.1.
| Feature | Specification |
| Mark | Birelart (original room / freeline) |
| Mandatory material | EPDM only (resistant to brake fluid) |
| Use | Tank sealing, fittings, or static |
| Compatibility | 22SR / 22SRR / CL pump |
| Typical | Often black (sometimes green / blue according to manufacturer) |
Fit an O-ring seems simple, but that's where micro-leaks are played.
Cleaning the throat: Before setting the new gasket, cure the throat with a plastic tool or a fine cloth. He must not stay no deposit dried liquid, otherwise the seal can not compress correctly.
Lubrication: Never mount a "dry" O-ring. Coat the slightly clean brake fluid (or specific EPDM grease) before putting it in place.
Avoid twisting: When setting up, make sure the seal is not "spinning" on itself in the throat. An torched O-ring will be 100% fugitive.
Tightening: Never tighten the fitting or plug by forcing the seal. The seal must seal by compression, not by excessive crushing.
"The O-rings is like tires: they get older if you do not ride. The trick: If you take out your kart after a wintering, check the flexibility status of your joints. If by touching the O-ring of the tank cap, it seems hard or cracked, replace it. My Pro Council: Never play the card of the economy on a seal at 2 euros. An air intake at a reservoir O-ring can introduce moisture throughout your braking system, which will make your unstable hot brake fluid. The braking is zero compromise. "
Q: Can I measure an O-ring to buy one in the commerce ?
A: It's very risky. Freeline / Birelart seals have very precise sectional tolerances (the thickness of the torus). A difference of 0.1 mm can cause a leak under pressure. Always use the Birelart reference.
Q: Why does my seal seem to be "melt" in the liquid ?
A: This is the irrefutable proof that the seal is not in EPDM. It is an immediate chemical reaction with the dot liquid. It is necessary to purge the whole circuit immediately, because pieces of gum were able to leave in the hoses towards the stirrups.
Q: Are there any O-rings on the piston itself ?
A: On most 22SRR pumps, the piston uses lip cups (Dynamic seal) and not O-rings (static seal). Do not confuse them because they do not play the same physical role in pressure climbing.
You work on your kart's most critical system. To finish your revision:
[Liquide de frein (DOT 4/5.1)] (But imperative can).
[Chiffon propre] (To clean fluid traces).
The tank is screwed into the body of the pump. Between these two rooms is an O-ring (O-Ring) or a sealing washer that does all the work.
The role of fixing: Hold the tank integral with the pump while ensuring perfect sealing to prevent air from being sucked into the circuit during the pumping phase.
Fragility: The tank threaded tip is often plastic. If you force too much, you risk breaking plastic in The body of the pump (very difficult to extract).
Do not replace the seals one by one if your pump is "spongy". The complete kit allows you to leave on a healthy basis.
Type content: The kit generally includes the piston, the primary cup, the secondary cup, the O-rings, the maintenance circlips and sometimes the protective bellows.
When to use it: As soon as you see a loss of constant pressure, an internal leak (the pedal drops gently under pressure), or after a long wintering where the liquid could crystallize.
Although it is a simple room, the internal spring of the 22SR pump filled a major safety function:
Return of the piston: It guarantees that the piston returns to the "rest" position after each braking. If the piston does not return completely, the circuit does not fulfill correctly by the tank, creating a soft pedal or braking that "drag" (drives that heat).
Maintaining pressure: It ensures a constant pre-load for the joints (cups) remain in place.
Reactivity: It allows the pedal to go back immediately as soon as you relax the foot.
The Revision kit for diameter brake pump 19 mm is a complete set of original repackaging (Original Freeline Racing Parts). It is essential for restoring absolute sealing, hydraulic pressure and reactivity of your rear brake master cylinder or 19 mm.
As shown in detail the reference photo 12856.jpgThis all-in-one kit brings together all the hardware and internal wear parts necessary for professional refurbishment. Rather than replacing a complete master cylinder, this package of factory parts allows you to eliminate pressure losses, liquid leaks at the pedal and the phenomenon of "spongy pedal" that spoil your chronos on the track.
The FREELINE DIAM 22 brake pump complete Birelart - CL is an essential component for Karts, designed and manufactured by Birelart in Italy to provide optimal performance and increased durability. This brake pump is specially adapted for KZ or KF type karts and is compatible with Charles Leclerc, RicCardo, Kubica and LGK Birelart chassis. It is ideal for pilots seeking to improve the performance and reliability of their braking system.
The cup (or lip seal) is a wear part. Its role is to transform the pressure exerted by your foot into hydraulic pressure into the pipes.
Symptoms of fatigue: "Spongy" pedal (which goes down to the floor), liquid leakage at the bellows (cap), or braking loss during high heat phases.
The material: These joints are EPDM (ethylene-propylene-diene monomer) to withstand the brake fluid. NEVER USE STANDARD JOINTS Hardware stores, they will disguise in a few minutes in contact with the liquid.
The Revision Kit for Cylinder 16mrr is a hydraulic reconditioning set of origin manufacturer (Original Freeline / Birel Art). This targeted kit makes it possible to renovate the 16 mm diameter brake pump system (MRR model), usually used on the front braking systems of gearbox karts (Kz) or on some specific rear systems of the group Birel Art.
As highlighted the reference image 13479.jpgThis technical bag precisely contains internal wear parts subject to repeated friction and chemical aggression of the brake fluid. Periodic replacement of these components eliminates internal pressure losses, deleting liquid leaks at the pedal linkage and restoring a firm and accurate attack to your hydraulic system.
The Circlip Birelart is a critical safety piece for your braking system. Its role is to lock the axis that crosses the brake pads inside the stirrup. Without it, the intense vibrations of karting could slide the axis, resulting in the loss of the pads and a total braking failure.
Made of high quality spring steel, this "wire" circlip has a calibrated voltage to stay lodged in the throat of the axis, even under the most severe constraints encountered in competition.
The Brake pump axle fork is a detached part of the manufacturer's original security (Original Freeline / Birel Art). This mechanical high-strength steel mechanical element ensures the direct and critical connection between your linkage (brake rod connected to the pedal) and the internal piston of your master cylinder (brake pump).
As illustrated on the reference image 12831.jpgThis part consists of a machined cylindrical portion that fits side pump and an openwork U-shaped clevis allowing the passage of the link link. Designed to endure repeated and extremely violent braking pressures, its original manufacture guarantees perfect bore tolerances for Eliminate any parasitic game in the pedal, offering the driver a specific feeling and an optimal dosage during the deceleration phases.
The Liquid tank for brake pump 22SR is a spare part of origin manufacturer (Original Freeline / Birel Art). This jar is specially designed to power the master cylinder (brake pump) model 22SR that equips the braking system of the group competition chassis Birel
The cup (or lip seal) is a wear part. Its role is to transform the pressure exerted by your foot into hydraulic pressure into the pipes.
Symptoms of fatigue: "Spongy" pedal (which goes down to the floor), liquid leakage at the bellows (cap), or braking loss during high heat phases.
The material: These joints are EPDM (ethylene-propylene-diene monomer) to withstand the brake fluid. NEVER USE STANDARD JOINTS Hardware stores, they will disguise in a few minutes in contact with the liquid.
The Birel - Charles Leclerc brake caliper repair kit is an original Birel ART part, distributed by Magickart, official reseller in France. It is compatible with the KZ rear caliper or the two KZ front calipers. For a complete kart, it is necessary to purchase two kits . Magickart recommends assembly by a professional to ensure safety and braking performance.
The Circlip Birelart is a critical safety piece for your braking system. Its role is to lock the axis that crosses the brake pads inside the stirrup. Without it, the intense vibrations of karting could slide the axis, resulting in the loss of the pads and a total braking failure.
Made of high quality spring steel, this "wire" circlip has a calibrated voltage to stay lodged in the throat of the axis, even under the most severe constraints encountered in competition.
In the 22SRR pump, this part ensures Dynamic tightness. Unlike a static O-ring (which does not move), it is subjected to a constant back and forth movement at each pressure on the pedal.
Function: It prevents the brake fluid from reflving backwards the piston and holds the hydraulic pressure needed to operate your stirrups.
Consequence of a failure: A pedal that becomes "soft", which sinks to the floor, or a leak of liquid that appears at the protective bellows (cap).
The Set of 4 Tires Kart VEGA SL4 (Red) 2024 is the latest innovation of VEGA, designed to offer exceptional performance in national categories. Whether you're using a direct drive or a 125-speed transmission engine, these tires are the ultimate reference for balanced and efficient driving.
The engine TM KZ R3 – Full Black represents the latest developments of the TM Racing, certified for competition and designed to offer maximum performanceflawless reliability and one exclusive design. This engine is complete delivered and ready to use, including all necessary components for a immediate installation and one optimal driving experience.
With his version "Total Black", this engine is distinguished by its black Edition componentsoptimized cylinder preparation, 1 new high performance clutchenhanced gearbox and one robust engine housing, ensuring increased powerexceptional durability and one high-end aesthetics
TheRear brake caliper RR-I32x2 FL01 Full is a high-end component designed by Birelart, specially developed for Competition karts. This stirrup is specifically adapted for chassis Birelart, Charles Leclerc, RicCiardo, LGK and Kubica, and is Comes with its brake pads, offering a Optimal braking performancea outstanding reliability and an Increased durability.
Made with High quality materials, this stirrup is Lightweight, resistant and precise, guaranteeing a Powerful and progressive braking, essential for demanding pilots in competition. His Ergonomic design and his robust construction make it a choice indispensable For teams and drivers seeking to maximize their performance on the track.
TheRear brake caliper KZ RR-I25x4-h16 / a hq is a high-end component designed by Birelart, specially developed for Competition karts in Category Kz. This stirrup is specifically adapted for the kz chassis and is Comes with its 4 high performance brake pads, offering a Optimal braking performancea outstanding reliability and an Increased durability.
Made with High quality materials, this stirrup is Lightweight, resistant and precise, guaranteeing a Powerful and progressive braking, essential for demanding pilots in KZ competition. His robust design and his Optimized construction make it a choice indispensable For teams and drivers seeking to maximize their performance on the track.
The model Flat Out 330 High Grip is distinguished by its slightly more compact diameter (330 mm instead of 340 mm) and its technical coating designed to provide maximum friction with racing gloves.
High Grip Technology: The specific coating (textured polyurethane or high density alcantara in serial) makes it possible to maintain a firm socket with less physical stress, thus reducing the cramps and the fatigue on the long sleeves.
Diameter 330 mm: This shorter format offers a brighter and more direct direction, preferred by KZ drivers (gearbox) or those seeking instant reactivity.
Ergonomic structure: Profiled branches for quick access to pallets (clutch or steering wheel brake) and a clear reading of the instrumentation.
The CRG Kt2 is the versatile chassis par excellence of the Italian manufacturer. Unlike the Rébec Road (more rigid), the KT2 uses a frame compound full of tubes of 30 mm in diameter. This architecture offers controlled flexibility, ideal for freeing the engine in categories without gearbox like the OK, Iame X30 or the Rotax Max.
Its geometry allows fast adaptation to all track conditions (high grip or green track "). Featuring the last components of the range CRG RacingHe combines exceptional motor skills at a surgical front train accuracy.
The CRG KT2 2026 Version Kz redefines the standards of the Queen category. While the Road Rebel (32mm) remains the choice for the tracks with very high grip, the KT2 in 30mm Has become the favorite weapon of Kz pilots looking for more agility and ease in the support changes.
For 2026, CRG Reworked the composition of chrome-molybdenum steel to provide a better response from the front train during degressive braking. This KZ version stands out for its localized structural reinforcements and its integral front / rear braking system, essential to stop the power of 50 horsepower engines
On a 22SRR pump, you find O-rings at different locations (tank hose entrance, fill cap, sometimes as guiding joints).
The most important point: The material. The seals used in hydraulic braking must imperatively be in EPDM (ethylene-propylene).
The danger: If you are using a "standard" O-ring (often in NBR / black nitrile bought in DIY store), it will swell, disintegrate and pollute your circuit in less than a few hours in contact with the Brake fluid DOT 4 /5.1.
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