Why You Might Need New Rotors Every Brake Service
Wouldn't it be simpler if you could simply add new brake pads and call it a day? While it can be tempting to discount a vehicle's rotors in favor of a more straightforward repair job, the reality is that the least cost-effective approach may not always be the safest. This article explores the reasons behind the necessity of new rotors during brake service and the implications for both safety and cost.
The Evolution of Brake Service Practices
Recently, several fast-fit centers have opened near my workshop, a stark contrast to the thorough and detailed service my customers have come to expect. These shops have a one-size-fits-all policy: replace everything so that you don't have to worry about potential issues. Yet, a customer walked into my shop recently, frustrated and annoyed. He had been to a fast-fit center for a free safety inspection and, to his chagrin, they had replaced the entire set of brake discs, despite the fact that his brakes had only been serviced a week earlier. The reason? The newer vehicle had drum type brakes, and the shop simply replaced the discs and pads out of habit.
Why New Rotors Are Recommended
There are several compelling reasons to replace rotors during a brake service, especially when brake pads wear down. As brake pads gradually wear, they create grooves or irregularities in the rotor surface. These grooves can significantly impair the effectiveness of the brakes. Here's why:
Diminished Stopping Power: High spots on the rotors can reduce the effectiveness of brake pads, reducing stopping power. Depending on the size and shape of the grooves, this reduction can even reach up to 40%.
Incorrect Pad Seating: Worn rotors can cause new pads to seat improperly, leading to potential issues with brake performance.
Brakes Pulsation: Bruised or worn rotors often lead to brake pulsation, causing a bumpy ride and potential safety hazards.
Heat Dissipation: Rotors designed specifically for modern vehicles are often more efficient in dissipating heat, especially during high-speed driving.
The Financial Implications
The cost of rotors has dropped over the years, making their replacement a more attractive option. Additionally, the rising cost of labor makes resurfacing rotors a less economical choice. According to my observations, restoring old rotors to a like-new condition can cost around $30-$40 each, or approximately $60-$80 in total. In comparison, new rotors can be found online for as low as $25-$70, making them a cost-effective solution for many drivers.
When to Replace vs. Resurface
The decision to replace or resurface rotors depends on several factors:
Vehicle Type: For a vintage farm truck, a quick replacement with new pads might be sufficient. However, for modern cars driven on highways, fully balanced and clean resurfaced rotors are essential.
Shop and Mechanic Policies: Some shops enforce new rotors to avoid liability concerns, while others base their decisions on the condition of the rotors. Some mechanics might merely replace them out of habit, while others adhere to "old school" practices.
Cost Considerations: If labor costs are high, it may be more cost-effective to replace rotors rather than resurface them, although this can vary widely.
Conclusion
Deciding to replace rotors during brake service is a complex decision influenced by numerous factors. While the financial incentive to replace may be tempting, the safety implications cannot be overlooked. It is crucial to weigh the benefits of improved performance and reliability against the costs and the preferences of your local mechanics and shops. By making informed choices, you can ensure both safety and cost-effectiveness in your vehicle maintenance.