Modern Vespa

hello to everyone... i would like to know if i can install a rear disk brake on my s150...

I have no idea but it would be nice to have a rear disk on the LX/S series.

i know sound weird, but i find my S with drum brake more...'retro' and besides this what is the advantage af it? i mean its not that bad

i think that the look will be very nice with this modification and i believe that we can speed down easier and faster... what's your opinion?

Let us know how it works out after you do install it!

A disc brake would have greater stopping power as well as better braking feel. You would also have the advantage of better braking control vs. the drum.

Any update on this? My back brake has been bugging mesince I bought the bike. It's way too soft. I've jackknifed the bike twice with this system. I ride this bike year round and it's always wet and slippery here. Any sudden braking puts me on the ground it's dangerous and I want something safer and more effective!

Don't brake suddenly when it's wet then - anticipate and throttle off.

It's doable.

project S -- a hotrod modern smallframe

Well, there is the question of just what each brake needs to do. At best you want about 60/40 braking front to rear. If the rear brake locks up too easily - down you go. That is the same reason motorcycles tend to have two disks on the front and one in the rear or a big disk in the front and a smaller one in the rear.

Um. As I was saying it rains a good 9 months a year here and of course Ieave a wide berth between myself and the vehicle in front of me. Year round daily driving, often long distances causes an inevitable need for occasional sudden braking. This is an emergency situation safety thing not a hard riding lifestyle goof-off thing. However the 'it's doable' response is very welcome news. I will talk to both of the Vespa mechanics in town (all two ofthem!) and hopefully it will be doable for one them and not outrageously expensive. I do really want it! Thanks so muchforyour feedback, so much appreciated!

While it's "doable" it's not easy and requires some high quality welding on the rear axle. It also moves the rear wheel back about 2" and requires some body work changes to make room for it.

The disk has way more stopping power than the drum but if you are already locking up the rear wheel then the tire is the limiting factor and the disk is only going to make it worse.

+1. No point in just improving how quickly the rear wheel will lock up.