Why do Subaru rear brakes wear faster?
Subaru vehicles are known for their all-wheel-drive (AWD) capabilities, but this design can also lead to faster wear on the rear brakes compared to the front brakes. The primary reason for this is the way power is distributed in Subaru's AWD system, which places more braking load on the rear wheels.
Power Distribution in Subaru's AWD System
Subaru's AWD system is designed to provide a 60/40 power split between the front and rear wheels, respectively. This means that under normal driving conditions, 60% of the engine's power is sent to the front wheels and 40% to the rear. This uneven power distribution puts more braking load on the rear wheels, which can lead to faster wear on the rear brake pads and rotors.
Braking Forces and Wear
When braking, the weight of the vehicle shifts forward, increasing the load on the front wheels and brakes. In a front-wheel-drive (FWD) vehicle, this weight transfer helps the front brakes do most of the work, leading to more even wear between the front and rear brakes.
However, in a Subaru AWD vehicle, the rear wheels are still receiving a significant amount of power, even during braking. This means the rear brakes have to work harder to slow the vehicle, leading to faster wear on the rear brake components.
Factors that Contribute to Rear Brake Wear
- Uneven power distribution in the AWD system: The 60/40 front/rear power split places more braking load on the rear wheels.
- Weight transfer during braking: The forward weight shift increases the load on the front brakes, while the rear brakes still have to work hard to slow the vehicle.
- Driving conditions: Aggressive driving, towing, or carrying heavy loads can further increase the braking load on the rear wheels.
- Brake pad and rotor quality: Lower-quality brake components may wear out faster, especially on the rear axle.
To help mitigate faster rear brake wear, Subaru recommends regular brake inspections and maintenance, as well as using high-quality replacement parts designed for the AWD system. Drivers should also be mindful of their driving style and avoid excessive braking or heavy loads that can further stress the rear brakes.
