Any New disk needs time to seat the pads, break in.
On my long wheel base recumbent I changed out the rear rim brake to the BB7 disk.
It took careful set up to get the disk to perform close to the rim brakes power and after 50 miles the brake seems to be getting better.
I still cannot lock the rear 700X28 tire no matter how hard I pull. My Tour Easy weight bias is very much rearward btw.
The bike stops real fast when BOTH brakes are used properly and the BB7 disk does give me better feel and control during hard or normal braking.
The BB7 works great when wet. The Rim brake did not.......
My Scott MTB:
I started out on the Hydraulic disk brakes with much caution, they were way powerful from the first ride.
The front needs to be slowly squeezed just like a motorcycle with dual disk or your going right over the bars.
Unbelievable feel and control they give me, even in the sand.
I took the bike out today and made a left when I should have went straight, wound up on a Intermediate trail that was a bit over my head.
OK ALOT over my head, I topped a rise and had a serious drop to deal with. I had to bleed speed all the way down to make the hard right
at the bottom. I know for a fact I was going a bit too fast and the hydraulic brakes with the very predictable feel are the ONLY reason
I didn't wipe out at the bottom.
Any body with any real skill or time on a MTB on technical trails would be fine with rim brakes, But not this rookie.
Oh and they work perfect when wet and muddy.....
My front derailleur cable was stretching in real fast so I cut the ride short,,8 miles or so.
The bike was great and did well In the sugar sand...
I didn't plan to wind up on a single track that advanced but I can say I will go back real soon.
I was at the Balm-Boyette Nature Preserve Mountain bike Trails. The Swampclub seems to be a pretty big outfit, I'm gonna look Into it.