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The complete master cylinder of origin OTK is the central organic hydraulic control member (Original OTK Kart Parts) for high competition braking systems. This high performance brake pump is the exact replacement part for the famous brake circuits BSS (manual front brake for KZ / DD2 box karts), Sa2 and Sa3 (Rear brakes or combined) Developed by the Italian factory for all the chassis of the group OTK.
Machined with surgical precision in an ultra-light and ultra-rigid aluminum aluminum alloy, this master cylinder guarantees instantaneous and loss of the force exerted by the driver. Its factory internal architecture incorporates a treated piston, a high-lip high-lip resisting extreme temperature set and high reactivity reminder. Delivered ready to be installed, this complete pump offers an irreproachable hydraulic pressure consistency, providing you with precise feeling at the pedal or control lever, handle after handle.
Compatibility Systems: OTK BSS (Front Brake), SA2 and SA3
Material: High quality aluminum forged and machined CNC
Elements included: Complete pump body, internal piston, seals, return spring, thrust axis, dust and tank bellows / built-in plug (depending on factory configuration).
Chassis compatibility: Tony Kart, Kosmic Racing Kart, Kart, Redspeed, LN Kart, Gillard
Origin: Original certified OTK (Italy)
* "Hi late braking artists! The brake pump OTK complete for BSS / SA2 / SA3 systems, this is best in terms of hydraulic feeling. When your old pump begins to flee or the pedal becomes soft despite three purges in a row, do not lose your time: change the set to leave a 100% healthy and secure basis.
My old mechanic trick to install this new pump: be careful at the connection and quality of the brake fluid !
When reconnecting your aviation hoses on the brand new aluminum, always replace small copper washers (sealing seals) on each side of the Banjo fitting. If you reuse the old washers already crushed, you will have an invisible micro-leak that will bring air into the circuit.
For filling, use only from brake fluid dot 4 or dot 5.1 high competition performance. Absolute prohibition to use silicone oil (dot 5) Other penalty to fling plant seals in a race weekend.
During the first purge, open the stirrup screw, let the liquid go down, then pump calmly. Do not slam the pedal like a deaf dry, it could return the new cups of the piston. A good slow purge is the assurance of reinforced concrete braking at the end of the straight line! "*
Put the kart on his carriage. Clearly drain the old brake fluid of the circuit. Disconnect the brake hose connected to the pump, unplug the control linkage (connected to the lever or pedal) and unscrew the mounting screws to remove the old pump.
Position the new BSS / SA2 / SA3 complete master cylinder on your chassis platinum OTK. Tighten the fixing screws firmly using the medium net brake to counter the vibrations.
Connect the thrust rod to your order by adjusting the guard (leave a light functional game at the pedal so that the piston returns well to bottom). Reconnect the hydraulic hose with new copper joints, as recommended in the trick in Michel.
Fill the pump tank with clean brake fluid (dot 4 or 5.1). Make a careful purge at the brake caliper to hunt all air bubbles. Once the pedal / lever perfectly firm, close the circuit, check the tightness of all connections and clean the potential brake cleaner.
Q: Is this pump delivered complete and ready for use or need to buy the seals except ?
A: She is delivered complete and factory assembly. All internal components (piston, seals, return spring) as well as the protective bellows are already installed inside the aluminum body. Simply fix it on the chassis, connect your hoses and fill up with liquid.
Q: What is the difference between BSS, SA2 and SA3 versions for this master cylinder ?
A: Factory OTK use a similar and highly standardized pump body architecture for these three generations and types of systems to ensure maximum reliability. Whether you use it to control your manual front brakes (BSS) on a KZ or for your back circuit (SA2 / SA3), this master cylinder offers the fluid displacement volume and the calibrated pressure for the original stirrups OTK.
Q: Can we mount this pump on a chassis of another brand (CRG, Sodikart, Birelart) ?
A: Technically, as long as the fixing center is fixed on the platinum corresponds and that the linkage aligns, a master cylinder can send pressure to any stirrup. However, this pump is calibrated specifically for the volume ratio of the pistons of the stirrups OTK. Install it on a braking system of another brand can change the race or firmness of your pedal unpredictably.
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
The hub of 35 mm long is considered a "short hub". In karting, The choice of hub length is a fundamental adjustment tool:
Short hub (35 mm): It offers less contact surface with the axle than models of 75 or 90 mm. This usually allows to have a "freer" behavior of the rear train, Helping the chassis to be free from curve, Ideal on tracks with a lot of grip (adhesion).
The hub of 40 mm long is often considered the "standard" or "versatile" value on adult karts equipped with a 30 mm (x30, axle, Rotax, Kz, ok). Unlike very long (75-90mm) hubs that considerably rigidify the rear, or the very short (35mm) that fully freed the chassis, the 40 mm Offers neutral and healthy behavior, ideal for starting a setting session before refining.
The hub of 85 mm is a "long" adjustment room. In karting, the choice of the hub length is directly related to the leverage exercised on the axle:
Stability and Grip: With 85 mm, you increase the rigidity of the rear train and removing the load outward. This is the ideal tool for more moving output output or to expand your back path without stacking spacers (which weakens the assembly).
R2.0 version: This name indicates an evolution of design at CRG (best machining, optimized weight and anodized finish "Gold" for higher resistance to corrosion).
The 95 mm in magnesium is an extreme room. This is not comfortable equipment, it is a precision tool for high-level drivers (KZ, OK, X30 senior categories).
The hub of 95 mm is one of the longest models available in the range CRG. In karting, the length of the hub is directly correlated to the "lever arm" applied to the axle:
Deported support: With 95 mm, you drop the load of the wheel outwardly. This helps to charge the rear train in support more, ideal for tracks where you miss moving out of turn.
Aluminum rigidity: Unlike magnesium, this aluminum version offers high structural stiffness and excellent durability, while being easier to maintain and less sensitive to oxidation. Finishing Gold (anodized) effectively protects the part against premature wear.
The 105 mm in magnesium is a high competition room. This is not a basic setting, it is a specific solution for specific needs:
Maximum lever arm: With 105 mm, you drop the load outward to load the outer rear tire. It is the absolute weapon when the kart is sorely lacking on the turn out of turn.
System "2 screws": In a length of 105 mm, a one-screw tightening would be insufficient and would create an imbalance. The system to 2 screws Allows you to distribute the tightening force over the entire length of the ring, ensuring a perfect maintenance on the axle without creating a single voltage point.
Magnesium (mg): It offers valuable weight gain on non-suspended masses and thermal dissipation that stabilizes the pressure of your tires during long finals.
The Complete master cylinder of origin OTK is the central organic hydraulic control member (Original OTK Kart Parts) for high competition braking systems. This high performance brake pump is the exact replacement part for the famous brake circuits BSS (manual front brake for KZ / DD2 box karts), Sa2 and Sa3 (Rear brakes or combined) Developed by the Italian factory for all the chassis of the group OTK.
Machined with surgical precision in an ultra-light and ultra-rigid aluminum aluminum alloy, this master cylinder guarantees instantaneous and loss of the force exerted by the driver. Its factory internal architecture incorporates a treated piston, a high-lip high-lip resisting extreme temperature set and high reactivity reminder. Delivered ready to be installed, this complete pump offers an irreproachable hydraulic pressure consistency, providing you with precise feeling at the pedal or control lever, handle after handle.
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