1997 mini cab spun out after urgent braking, then tumped it.

I was driving my mini cab and had to do a urgent braking and the truck took a sudden swerve that took me off guard, I was able to stop but the thing softly tilted onto it's side. I had some help and tumped it back on its wheels. My problem is that should not have swerved like that. It felt like one of my wheels didn't engage the brake and thru me into a spin.
I took inspected the rear drums and they look like that both activated with a partner tapping the breaks. The only thing I didn't change was the brake fluid, so i started doing the brake fluid change.

I sucked out the brake fluid from the resevoir and put new fluid in and went to the passenger side rear and loosened the bleed nipple and bleed fluid out of there until clean.
Then I went to the driver's side rear and could not find the bleed nipple on that cylinder.
is there supposed to be one there? or what am I missing?