Actually your brakes usually place more of a demand on a servo then steering.

I myself run dual 170SBL's in my buggy. More torque then you need for either but the holding power of the servos is rock solid. I Also really like the fact that you can choose a leed length that does not leave you with a pile of extra wire wrapped up somewhere!

The 170SBL's are great servos, also the nice thing about this is you have one spare for both positions in your car. I do not like the 170T's to slow.

Also the SBL is newer more energy efficient tech the the regular 170T. the BL's are a brushless corelesst tech that uses less power, is smoother and various other things.