Dot-3 brake fluid in E-moped?

[Chalo]

I'd like to reiterate that DOT 3 and DOT 5 are incompatible fluids and should never be mixed with each other.

Maybe as best practice? But silicone doesn't interact chemically with glycol, mineral oil, or seals for either fluid. In practice, it can be contaminated with either one without ill effects as far as I've seen (assuming the other fluid is compatible with the .
hydraulic system).

In the cycling industry, Main Street pedicabs use a Magura rear brake lever (designed for mineral oil) with a racing kart caliper (designed for glycol) with DOT 5 silicone fluid. In this implementation, it is important that neither glycol nor mineral oil is introduced to the system because the seals at one end or the other could be affected.

 

[PaPaSteve]

What vehicle did you do that on? Any issues? What benefits were you expecting (switching from DOT 3 to DOT 5)?

Switching to a higher heat capable fluid is only really needed if your pushing the vehicle hard enough to cause higher heat.
When using the scooter have the brakes gotten so hot they fade enough to feel soft or not stopping quick enough ?
All vehicles will have a maintenance schedule detailing when fluids need to be changed.
Sometimes the fluids need to be changed more often.
Brakes being a critical safety item, they should be inspected often.
In your case the friction pads likely glued to the disc.
Removing the pads and sanding the debris off the pads and disc would have been my first task.
Cleaning the visible gunk off the pistons is a good idea too.
Using the hand lever to push the pistons out just a little to aid cleaning, careful not to push too much as they could come out.
Push pistons back in to reinstall brakes to the bike.

 

[marty]

Cleaning the visible gunk off the pistons is a good idea too.
Using the hand lever to push the pistons out just a little to aid cleaning, careful not to push too much as they could come out.
Push pistons back in to reinstall brakes to the bike.

Good suggestion. Before pushing piston out. Get something the same size of rotor thickness and two worn pads. [Not your fingers] Use that to stop piston from coming out too far.

Here in Buffalo NY. Land of salt and rust. I clean calipers with wire brushes and assorted weapons. Compressed air is good for blowing off dust. Careful not to breathe it.