there are advantages to either:
hub-mounted advantages:
- unless the wheel comes off, you should have emergency braking
- you have two emergency brakes instead of 1
disadvantages:
- complexity, from maintaining adjustment due to the varying cable length, to basically having two different brake system at each rear wheel
- more susceptible to loss of braking due to water or grease contamination
- requires more force to hold the wheel in place
- takes more space at the wheel thereby reducing the available brake surface for the disk brakes
t-case mounted advantages:
- less complex
- force multiplication. I have 4.56 gears in the rear, that makes the t-case brake 4.56 times more effective then a similar wheel-mounted one.
- easier to keep adjusted and suspension movement doesn't cause system to go out of adjustment.
disadvantages
- 1/2 the e-brake force as having one on each hub
- if it fails, it all fails
- if you break driveshafts, you've no emergency brake
- if you have open differentials, you only have one tire holding your entire vehicle from moving
- harder to fit to existing systems
In my case, I have mechanical lockers on both ends, so while in 4wd, all 4 tires will hold it in place
I get larger brakes to control the larger tires
after my struggles with the e-brake on my Corvette.... I'll never, willingly use hub-mounted brakes.
