There could be several reasons why rear brakes wear out faster than the front brakes. Here are a few possible explanations:
Brake bias: The brake system of a vehicle is designed with a specific brake bias, which determines how much braking force is distributed between the front and rear wheels. In some vehicles, the brake bias may be biased more towards the front brakes, resulting in the rear brakes doing less work and wearing out faster.
Driving habits: Your driving habits can have a significant impact on brake wear. If you frequently engage in aggressive braking, such as braking hard and late, it can put more stress on the rear brakes and cause them to wear out faster.
Weight distribution: The weight distribution of a vehicle can affect brake wear. If a vehicle has a rear-weight bias, such as in the case of trucks or vehicles with rear-mounted engines, it can put more load on the rear brakes, causing them to wear out faster.
Parking brake usage: If you use your parking brake frequently, it can contribute to faster rear brake wear. The parking brake typically engages the rear brakes, and if it is not adjusted properly or released fully, it can result in increased friction and accelerated wear.
Mechanical issues: There may be mechanical issues with the rear brake system, such as sticking calipers, uneven brake pad wear, or inadequate lubrication, which can cause the rear brakes to wear out faster.
It's important to note that the specific reasons for rear brake wear can vary depending on the make and model of the vehicle. If you're experiencing significantly uneven brake wear, it's advisable to have your vehicle inspected by a qualified mechanic who can diagnose the issue and provide appropriate recommendations.