Originally Posted by
shadowtuy
...usually first thing in the morning
...goes away after i let go of the brakes
...usually first drive of the day as well, when i brake lightly i get a very faint wobble in the steering wheel.
...goes away after i press harder not to return until maybe the next day
It's not unusual for a slight amount of surface rust to accumulate on the rotor surface in a matter of hours. It's more likely if the car is parked outside and it rains (or you wash the car but don't drive it right away). The first time you hit the brakes in the morning, you hear a grinding noise as the surface rust is basically cleaned off the rotors by the brake shoes. It can also affect the feel of the pedal the first time you use the brakes in the morning. As soon as you hit the brakes once or twice and the rust is blown off, everything returns to normal.
Unless you use your brakes a ton, you shouldn't need rotors at 25k miles. If they have excessive runout (in other words...they're warped), you would pretty much feel that every time you hit the brakes. That's not something that goes away on its own. And you can't tell this by looking at them. You need a dial indicator because they only need to be out by .002 of an inch before you can start feeling it through the pedal. So don't rush out and spend money on new parts just yet.
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View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)