I have a new roo with I think Model Mechanic brakes and retracts. It's new, but I got it second hand.
The brakes will barely slow the plane down, even with 120 psi.
I had the O-rings lubed with vaseline, tried removing that and it doesn't seem any better.
I'm using the supplied valve.
Any way to improve the braking on this system?
I'm used to brakes that will lock the wheels if necessary.

Appreciate any ideas on this.