Do I Need to Replace Both Front and Rear Brake Pads?

[RowanFitz]

Front and rear brake pads do not need to be replaced together. Here are the specific details about brake pads: 1. In terms of replacement cycles, rear brake pads have a longer service life. Front brake pads need to be replaced every 30,000-50,000 kilometers, while rear brake pads can last for about 60,000-100,000 kilometers before replacement. 2. New brake pads are approximately 1.5 centimeters thick. If they wear down to only one-third of their original thickness, which is about 5 millimeters, they should be replaced promptly. When replacing brake pads, both pads on the same axle should be replaced together to ensure balanced braking performance on both sides. 3. The most common brake pad materials currently are semi-metallic and ceramic. Semi-metallic pads are commonly used in household vehicles, while ceramic pads are generally better—more wear-resistant, heat-resistant, with better thermal stability, faster heat dissipation, and higher friction coefficients. Ceramic pads are more often used in mid-to-high-end vehicle models.

[StLillian]

Last time I went for maintenance, I specifically asked the master technician, and he said that the front brake pads wear out two to three times faster than the rear ones. This is because during braking, the weight shifts forward, and the front wheels bear the majority of the braking force. From my experience, you need to replace the front pads twice before replacing the rear pads once. Normally, just pay attention to the friction sound when braking—once you hear a metallic sound, it means it's time to replace them. The rear pads aren’t as urgent; you can wait until they’re down to about 3mm in thickness. A money-saving tip is to choose reliable ceramic pads from reputable brands, which last 30% longer than regular pads. A full set replacement costs around 400 yuan, which is even more cost-effective than replacing just the front pads at a 4S shop.

[AdrianaRose]

It depends on the specific model! The maintenance manual for my 4WD SUV clearly requires simultaneous replacement of both front and rear brake pads. Last time I was lazy and only replaced the front ones, resulting in brake pulling within two months. However, regular sedans aren't so particular about this - like Sister Wang's Fit in our neighborhood which has been running for seven years with the rear brake pads still at half thickness. The key is to check actual wear data. I suggest having mechanics measure thickness with vernier calipers during each maintenance - replace when front pads are below 3mm and rear pads below 2mm. Special reminder for friends who've upgraded to larger rims: due to increased unsprung mass, it's best to check the shoe retaining springs every 40,000 kilometers.

[VonPhoebe]

Having worked in an auto repair shop for eight years, I've seen that 90% of brake failures are caused by uneven wear between front and rear pads. Last month, a Corolla was towed in with locked brakes simply because the owner only replaced the front pads and neglected the rear ones, causing the rear wheel calipers to seize due to aged shoe pads. The safest practice is to replace all four wheels' brake pads with the same brand and batch, especially since modern cars come with electronic parking brakes, making rear caliper structures more complex. Don't believe those amateurs who say 'rear pads don't need attention.' Last time I tested for a customer, excessively worn rear pads caused the ABS to engage prematurely, making the car particularly prone to skidding in rainy conditions. I recommend Ferodo or Nisshinbo's complete sets, currently priced just over 600 RMB during Tmall's promotion.

[LenaMarie]

From a physical perspective, it's essential to replace them simultaneously. During braking, the vehicle's kinetic energy is converted into thermal energy, with the front and rear brakes sharing the load at approximately a 70:30 ratio. Just like wearing one new shoe with an old one can cause ankle twisting, differing friction coefficients between new and old components can easily lead to unbalanced braking torque. I tested this on my old Passat: using new ceramic pads in the front and semi-metallic pads in the rear increased the emergency braking distance from 60km/h by 2.3 meters. More troublesome is the imbalanced pressure in the brake lines, which can easily rupture the rear wheel cylinder seals. It's recommended to replace the rear pads every two front pad changes. You can purchase the Bosch Safety Kit on JD Car Maintenance for just 498 yuan, which includes installation.

[LaAlivia]

As a modification enthusiast, I must share a little-known fact: you must check the rear brake pads after a track day! Because during high-speed cornering, the rear wheels bear greater lateral forces, and the wear on the rear pads often surpasses that of the front pads. Last time at Tianma Circuit, I saw an 86 with its rear brake pads worn out and smoking. For regular driving, pay attention to three indicators: if the steering wheel shakes during light braking, it's time to replace the front pads; if the car's rear swings left and right during hard braking, check the rear pads; if the electronic handbrake takes more than 5 seconds to engage, the shoe clearance is too large. Remember to reset the brake caliper when installing new pads. Now, you can search 'DIY brake pad replacement' on Douyin for detailed tutorials. The whole set of tools can be done for just over a hundred yuan.