I've been running a standard ('75 & up) FJ40 master cylinder and just haven't been happy with my brake performance. I read various options and decided to go with FJ80 master for an 90-92.
I just installed it tonight and I highly recommend this option. Great pedal feel and now I stop with authority.
Also, RockAuto has a private label option for under $30 with reservoir, cap and level sensor. Thought I'd make everyone aware of the deal.
Heres all the cross referencing part numbers too...
