Yeah, a friend of mine rolled his Runner on account of rear brake lock-up, but then he was not used to the truck yet, was new to him.
I purchased a Wilwood manualy adjustable valve.
Will be installing it later this summer with new routing, etc.
I also can lock up the rear un slippery surfaces.

'86 SR-5 Extra-cab 4 x 4, 2" BL, 33 x 12.5 x 15R M/T on 15 x 8 rockcrawlers ( 3 3/4" BS ), 22RE 5 sp , 4.88's Detroit True-Trac front, V6 open rear, 24 mm Sway-Away + Rancho 5000's, removed sway bar, no-rust south US bed, Ramsey 8000 winch