Pump Yer Brakes is an achievement in Halo 4. It is obtained by scoring the killing blow on a Mantis.
- The easiest way to do this is to board a Mantis and plant a grenade in it,but make sure that there are few or no teammates around that could kill the Mantis before the grenade goes off.
- This achievement can be done in tandem with David and Goliath.
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