Can motorcycle drum brakes be replaced with disc brakes?

[DelCaroline]

Motorcycle drum brakes can be replaced with disc brakes. If converting the front wheel to disc brakes, it requires replacing the rim, shock absorbers, and adding a complete disc brake system. For rear wheel conversion, modifications include the rim, rear swingarm, brake caliper, etc. Generally, front wheel conversion is relatively easier, while rear wheel modification is more challenging. Additional information: 1. Principle of disc brakes: The working principle of a disc brake system involves installing a disc that rotates synchronously with the wheel on the hub, and mounting calipers on the front fork and frame. The brake pads inside the calipers clamp the disc to achieve braking. 2. Characteristics of disc brakes: (1) Disc brakes have better heat dissipation than drum brakes, reducing the likelihood of brake fade and failure during continuous braking. (2) The size change of the brake disc after heating does not increase the travel of the brake pedal. (3) Disc brakes do not have the self-servo effect of drum brakes, resulting in more balanced braking force between the left and right wheels.

[LeGage]

Yes, it can be modified. I've done it myself twice. Drum brakes have a simple structure but suffer from severe heat fade, especially during long downhill rides where they can easily fail. Converting to disc brakes requires a whole new set of components: the fork must be compatible, you need to install a rotor mount and caliper, and you'll also have to adjust the master cylinder and brake lines. For older bike models, you might need to weld a bracket, which is quite troublesome—it's best to use a universal kit. You'll need a full set of tools: wrenches, screwdrivers, as well as brake fluid and a bleeding kit. Once, I installed the caliper backward, and the brakes didn't work properly—I almost had an accident. Professional shops charge around two to three thousand, but doing it yourself can save you half. However, when testing, be sure to go slow at low speeds. After converting from drum to disc brakes, the feel becomes lighter immediately, with faster response, and there's no slipping on wet roads. But if the wheel hub is too old, you might need to replace it as well, making the total cost potentially not worth it. In short, it's highly feasible but comes with risks, so it's best to assess your capabilities.

[VanAdalynn]

Modification is certainly possible, but the costs need careful calculation. A complete disc brake system can range from a few thousand yuan at the low end to over ten thousand yuan for premium options, plus labor fees. A friend of mine made the switch – his original drum brakes required frequent brake pad adjustments, which was time-consuming. Post-modification maintenance became easier, but incompatible parts like bearing sizes could lead to rework and additional expenses. From an economic standpoint, major investments in older cars may not be worthwhile; opting for factory-equipped disc brakes on new vehicles is often better. Consider long-term factors too: disc brake pads are pricier but more durable, potentially offering better value overall. Don’t just focus on upfront costs—factor in potential regulatory hurdles like failed annual inspections. If budget is tight, used parts are an option, but prioritize quality. Safety first—never compromise for cheap solutions.

[MacIsla]

Modifications require caution; I've been focusing on safety for a decade. Converting drum brakes to disc brakes affects braking balance, and improper installation can lead to veering or overly sensitive front brakes causing fishtailing. Legally, many regions prohibit unauthorized modifications to braking systems, and insurance may deny claims in case of accidents. Always seek a qualified shop for professional testing, including force measurements, as DIY attempts may not meet standards. Practical risks include brake fluid leaks or ABS mismatches, which can lead to severe collisions. Check the owner's manual to see if modifications are allowed; otherwise, don't take the risk. While performance does improve—better heat dissipation can nearly halve braking distances—safety comes first, especially at high speeds. In short, modifications are feasible only if legal.