 I've gone through 2 sets of disk brakes 
due to poor design of brake components 
by Toyota - or some other unknown 
reason.  My Tundra was repaired at 
29,000, but the service department had 
received a "bulletin" that this problem 
(vibration in steering wheel during 
braking) would possibly occur.  My 
previous truck was a different make, 
but I was able to drive 98k miles on 
the original manufacture's brakes.  