In a diagonally split braking system, which wheel should be bled first when replacing the left front caliper?

In a diagonally split braking system, which wheel should be bled first when replacing the left front caliper?

• A. Left Rear
• B. Right Rear
• C. Left Front
• D. Right Front

Answer: (B)

In a diagonally split braking system, the two hydraulic circuits share different wheel pairings: one circuit powers the front-left and rear-right brakes, the other powers the front-right and rear-left brakes. When you replace a caliper and bleed, you work within the same circuit and start with the wheel farthest from the master cylinder to push any trapped air toward the reservoir. The left-front caliper is part of the circuit that includes the right-rear wheel, so the farthest wheel in that circuit from the master cylinder is the right-rear. Bleed that wheel first to effectively purge air from the circuit containing the left-front caliper.

In a diagonally split braking system, the two hydraulic circuits share different wheel pairings: one circuit powers the front-left and rear-right brakes, the other powers the front-right and rear-left brakes. When you replace a caliper and bleed, you work within the same circuit and start with the wheel farthest from the master cylinder to push any trapped air toward the reservoir. The left-front caliper is part of the circuit that includes the right-rear wheel, so the farthest wheel in that circuit from the master cylinder is the right-rear. Bleed that wheel first to effectively purge air from the circuit containing the left-front caliper.