adlai

Front brake has lost fluid pressure. How to refill it properly? I think I see a fill port on the brake lever but I'm not seeing any openings on the brake. Also, the nut holding the hose in is extremely tight and I can't get it to loosen. Do I just apply more force or is there something else?

adlai

mpetry912 

there are a number of "kits" available that have a fill funnel and a syringe to bleed the brake at the caliper end.

don't loosen the hose if you don't have to. There should be a bleed screw.

The main challenge is to keep air from getting into the line when you have it opened for bleeding.

there are a number of youtube vids that will walk you thru the process: mountain bike brake bleeding - YouTube

/markp

veganbikes

They are some brand of really poor quality brakes probably trying to sort of knock-off Shimano and Tektros lower end stuff. A set of M201s is probably a more sensible solution or finding a bike that doesn't come with off-brand brakes. Tektro makes fine serviceable brakes, Low end Shimano hydraulic disc brakes work decently enough no need to go anywhere else. At my old shop we replaced a set of Radius brakes on something because it was just a leaky mess and I have heard from other shops and mechanics have a pretty high failure rate for those brakes which is never a good thing. Also in my search for bleed procedure you can see a lot of customer comments saying they have failed or feel like crap.

I would not remove the hose unless it is leaking or damaged especially not for a bleed. If you are desperate to keep the brakes I think this thread from a popular online discussion place: Radius Brakes could be of some help

Pratt

Good points above. If a tire goes flat, or a chain brakes, it might spoil your ride, if your brakes go, it might spoil your life. Fortunately, bikes have two, independent brake systems, so if one goes, you still have the other.
Maybe change to Circumference brakes, 6.2832 times better.

Leisesturm

I do not (and neither would Sheldon Brown] agree that bikes have two independent brake systems. A bike has a front brake, supplemented, somewhat, by a rear brake that is there mainly for symmetry. I would (and have) ride 20 miles in rolling terrain with only a front brake. I would not ride a single centimeter without a functioning front brake. And, if I had as little knowledge about hydro discs as the o.p. appears to, I would not be asking for help. I would be taking the bike to an LBS or bike co-op and turning the matter over to someone qualified to help.

Pratt

Agreed, the front brakes do most of the stopping and the rear brakes just sort of suggest that it might be a good idea to slow down.