O-ring Birelart brake pump

Summary: the role of the joint n ° 11

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).

- Technical specifications

⚠️ Crucial warning: The material of this seal is specific. It must be in EPDM. Never try to replace it with a standard nitrile (NBR) or Viton o-ring from a universal seal box. The DOT 4 or 5.1 brake fluid would destroy a non-EPDM joint in minutes, resulting in a total braking loss.

- Mounting Tuto: Expert Precautions

Fit this seal requires a clockwork accuracy.

1. Cylinder inspection: Before laying the joint # 11, inspect the inside of the pump body. If you feel the slightest scratch with your nail, the new seal will be useless: it will fire immediately.

2. MANAGEMENT SENS: If your kit contains a lip seal ("u" or "V" shape), the lip must always be oriented pressure (inside side of the pump, to the liquid).

3. Lubrication: Imperatively soak the seal in brake fluid new before inserting it. Never put mineral fat or petroleum.

4. Insertion: The biggest danger is to "pinch" or return the seal at the time of entry in the bore. Use a blunt plastic tool to help it go back without forcing.

💡 Michel's trick

"The joint # 11 is what separates a race gained from an abandonment. The trick: After going up your pump with the new seal, do not fill in liquid right away. Operate the piston by hand (disassembled pump) to check that it slides fluid and regularly. If you feel a 'hard point', do not force. It is that the seal is slightly pinched or there is impurity. My Pro Council: Once reassembled on the kart, purge your system and leave the brake pedal under pressure (held with a bilge) overnight. If the next day the pedal has not moved, your editing is perfect. "

❓ FAQ SEO (Frequently Asked Questions)

Q: Is this seal the same as that of the standard CL pump ?

A: The 22SRR pump is a high performance evolution. Although the dimensions are close, the tolerances on joints may differ. Always use the specific reference to the 22SRR model to guarantee the tightness under high pressure.

Q: Should the piston change at the same time as this seal ?

A: It's strongly recommended. Over time, the piston may have micro-traces of wear or oxidation that become leakage paths for the new seal.

Q: My seal is black, is it normal ?

A: Yes, most EPDM braking joints are black. This is not the color that counts, but marking on the bag of the original Birelart room.

✅ Ready for your maintenance ?

You now have the keys for a successful renovation. To finalize your intervention:

• [Liquide de frein (DOT 4/5.1)] (NEW BOAT NEW ESSENTIAL).

• [Pince à circlips] (To access the piston).