Summary: the seal above all
The 22SR pump cover fills three critical functions:
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Protection against contaminants: The brake fluid (dot 4 or 5.1) is hygroscopic (it absorbs the moisture of the air). The lid, associated with its internal membrane, prevents water from polluting the fluid.
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Level maintaining: It secures the tank against projections during major vibrations of the kart.
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Management of depression: The internal membrane (often associated with the lid) allows the level of liquid to decrease as the platelet wear without creating a vacuum of air in the tank.
- Technical specifications
| Feature |
Specification |
| Mark |
Birelart (original parts) |
| Compatibility |
22SR brake pump (and derived models) |
| Material |
Machined aluminum |
| Finishing |
Anodizing (brake fluid resistant) |
| Configuration |
Lid alone (often sold with screws) |
| Use |
Competition (high performance braking) |
- Mounting tutorial: the hygiene rules
Working on the braking system requires surgical cleanliness.
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Pre-cleaning: Even before unscrewing the lid, clean all the outline pump with a brush and brake cleaner. If there remains dust around, it will fall into the liquid as soon as you open. It's a major piston blocking cause.
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State of the membrane: During disassembly, inspect the black rubber membrane inside. It must not be pierced or distended. If it is distorted, it will no longer play its bellows role.
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Tightening: Do not block the screws like a savage. The body of the pump is in soft aluminum. A tightening "Contact + a quarter turn" is enough. If you crush the gasket, you risk breaking the lid legs.
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Verification of the vent: Make sure the small vent hole on the top of the lid is not clogged with paint or grime. It is essential for the liquid to go down into the circuit.
💡 Michel's trick
"We often see 'sweat-or-fat covers, a sign of a light leak. The trick: If your brake fluid oozes over the cover, do not change the entire lid. In 90% of cases, it is the internal membrane that is either badly positioned or tired. My Pro Council: At each opening for purge, wipe the tank edge with a lint-free cloth. If you see crystal deposits (dried liquid), clean them gently. These deposits prevent the seal from the membrane from wearing flat and create leaks. "
❓ FAQ SEO (Frequently Asked Questions)
Q: Can I replace the brake fluid without opening this lid ?
A: No, it is necessary to open to do the level when purging, but be careful: the brake fluid is corrosive. If he flows on the chassis or your gloves, rinse immediately with the water.
Q: What is the small hole on top of the lid ?
A: It's the freestanding. It allows the membrane to deform and compensate for the volume of liquid that goes down to the stirrups as the platelets wear out.
Q: Why is my lid marked "Dot 4" ?
A: This is the type of liquid recommended by the manufacturer to guarantee the seals. Never mix liquids of different types (dot 4 vs dot 5.1), this could boost internal joints.
✅ Ready for your maintenance ?
The braking system is the only active safety element of your kart. To finalize your intervention:
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[Liquide de frein (DOT 4/5.1)] (Check your can, it must be open for less than 6 months).
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[Chiffons non pelucheux] (Indispensable not to leave fibers in the tank).