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Summary: The crucial role of the EPDM
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).
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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.
- Technical specifications
| 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) |
- Mounting Tuto: Expert Precautions
Fit an O-ring seems simple, but that's where micro-leaks are played.
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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.
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Lubrication: Never mount a "dry" O-ring. Coat the slightly clean brake fluid (or specific EPDM grease) before putting it in place.
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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.
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Tightening: Never tighten the fitting or plug by forcing the seal. The seal must seal by compression, not by excessive crushing.
💡 Michel's trick
"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. "
❓ FAQ SEO (Frequently Asked Questions)
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.
✅ Ready for your maintenance ?
You work on your kart's most critical system. To finish your revision:
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[Liquide de frein (DOT 4/5.1)] (But imperative can).
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[Chiffon propre] (To clean fluid traces).
40.4945.00
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Specific References
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.