Lambretta Front Brake Upgrade: Semi-Hydraulic Solution

What is semi-hydraulic conversion?

The semi-hydraulic conversion allows you to keep the original Campagnolo disc system while significantly improving its efficiency through the integration of a reduced but effective hydraulic circuit. The result is more immediate, decisive and controlled braking.

Required components

To perform the conversion correctly, the following elements are required:

1. STF Hydraulic Cylinder

2. Brake pump positioned under the nose

3. Brake pump support, available in versions compatible with:

   • Lambretta LI Series 1

   • Lambretta LI Series 2, Series 3, LIS, SX

   • Lambretta DL/GP

4. Aeronautical tube, available in two versions:

   • Short tube: for an even more decisive response

   • Long tube: follows the same path as the original sheath, ideal for those who wish to keep the system aesthetically faithful to the original

Simple and reversible installation

The installation of the components does not require permanent modifications or structural interventions. Everything is designed for a plug-and-play conversion, perfectly compatible with the original configuration of the Lambretta.

How to maintain an original aesthetic

Even from an aesthetic point of view, the conversion is designed not to alter the appearance of the vehicle:

• It is possible to apply the original “J” boss on the STF hydraulic cylinder

• The long aeronautical tube allows you to replicate the original path of the brake sheath, maintaining the aesthetic line of the scooter unchanged

How to Properly Bleed the Brake System of Your Lambretta

1. Brake Cylinder Preparation

Before proceeding with the complete filling of the circuit:

• Pull the piston slightly out of the brake cylinder.

• Fill it with DOT4 brake fluid.

• Once full, reinsert the piston, permanently securing the screw and the tube.

2. Filling the circuit

Now proceed with the complete filling of the oil circuit. Make sure to use the specific oil recommended for your system.

3. Manual purging (syringe effect)

At this point, do the following to facilitate the elimination of air:

• Compress the piston into the cylinder, just like a syringe.

• This movement pushes the oil into the circuit, helping to expel any air bubbles.

• Repeat this operation 2-3 times to obtain a good purge.

4. Pay attention to the position of the tube

A key detail that is often overlooked:

• The brake hose must always be slightly uphill when filling and bleeding.

• Avoid any upward kinks or puddles: if the tube is not perfectly angled upwards, air will remain trapped and will not be able to escape.

Conclusions

The semi-hydraulic conversion is currently one of the best solutions for updating the front braking system of the Lambretta, improving performance without sacrificing the classic look. It is a recommended intervention both for those who use the scooter in an urban environment and for those looking for greater reliability in sports driving.

Do you need technical support or want to receive more details about the components?
Contact us at: info@scooterthefero.com