In a diagonally split braking system, which sequence is correct for bleeding when replacing the left front caliper?

• A. Right rear, Left front
• B. Left rear, Right front
• C. Right front, Left rear
• D. Left front, Right rear

Answer: (A)

In a diagonally split braking system, two circuits feed opposite wheels, so air must be purged from the circuit that contains the caliper you’re replacing. Bleeding should start with the wheel farthest from the master cylinder on that same circuit, pushing air toward the reservoir. For the left-front caliper, its circuit also includes the right-rear wheel, so you begin by bleeding the right-rear. After that, you bleed the left-front caliper to remove any air introduced during removal and installation. Bleeding wheels on the other circuit (like front-right or rear-left) wouldn’t effectively purge air from the circuit shared with the left-front caliper, which is why those options aren’t the correct sequence.