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Summary: the weak link of precision
On your 22SRR pump, the "pin" (pin or pivot axle) of 5x15mm is the piece that undergoes shear forces at each braking.
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Function: It serves as a hinge for the lever that operates the piston of the pump.
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Why a specific room ? Unlike a metal rod cut at the right time, this pine is in treated steel (tempered). If you are using a "soft" stem of hardware, it will dig and deform in a few tours, creating an important game in your pedal (the famous "blur" at the beginning of the race).
⚙️ Technical specifications
| Feature | Specification |
| Mark | Birelart (original parts) |
| Diameter | 5 mm |
| Length | 15 mm |
| Material | High resistance steel / treated |
| Use | Lever Pivot / Push Rod Link |
| Fixing | Requires splitting pins or clips (according to assembly) |
🔧 Mounting tuto: the precision of the movement
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Cleaning the axis: Before putting it in place, clean the hole in the lever and in the screed of the rod with a solvent.
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Lubrication (essential): Apply a thin layer of high performance mechanical grease (lithium grease or rolling grease) on the axis. This will prevent the metal-sur-metal friction of "eating" the axis prematurely.
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Checking the game: Once in place, the pine must be able to pivot freely without hard point, but it should not not have side or vertical game in its home. If the "beats" axis in the hole is that the lever hole is oval: it will then consider changing the lever too.
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Securing: Make sure the safety pins (or clips) are in place. A pine that escapes in full straight line is an immediate loss of braking.
💡 Michel's trick
"The test of 'hollow' is your best friend. The trick: Take out your 5x15 axis and pass your finger on it. If you feel a groove (a marked hollow) in the middle of the axis, change it immediately, even if it is not broken. My Pro Council: This throat is the number 1 cause of the imprecise pedal sensation. By changing this axis for a few euros, you recover a sensation of 'click' net braking because you delete the game that exists between the axis and the lever. "
❓ FAQ SEO (Frequently Asked Questions)
Q: Can I replace this pine with a store M5 bolt ?
A: It's strongly not recommended. The thread of an M5 bolt would act as an abrasive file against the inside of the lever. The outer diameter of a bolt is also rarely perfectly calibrated for rotating mounting.
Q: How often should I replace it ?
A: Inspect it with each big revision (every 10-15 hours of rolling). If you feel the game in the pedal, it's the first piece to check.
Q: Is the 5x15 pine identical on all Kart brands ?
A: The 5x15 dimensions are common, but the hardness of the steel varies. Stay on the Birelart / Freeline part to ensure hardness compatibility with the aluminum lever.
✅ Ready for your maintenance ?
You have now inspected the pivot axis. To finalize your braking system:
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[Graisse haute performance] (For the pivot axis).
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[Goupilles fendues neuves] (Never reuse a pin that has already been twisted).
20.0873.06
Specific References
On your 22SRR pump, the "pin" (pin or pivot axle) of 5x15mm is the piece that undergoes shear forces at each braking.
-
Function: It serves as a hinge for the lever that operates the piston of the pump.
-
Why a specific room? Unlike a metal rod cut at the right time, this pine is in Treated steel (tempered). If you are using a "soft" stem of hardware, it will dig and deform in a few tours, creating an important game in your pedal (the famous "blur" at the beginning of the race).