Changing brake discs and brake pads

Brake pads and brake discs are items that require regular replacement to maintain optimal brake performance. Although the replacement process is straightforward, it’s advisable to entrust the task to skilled mechanics to ensure it’s executed correctly.

The fundamentals

Just as with suspension springs, shock absorbers, or tires, it’s essential to replace both brake pads and brake discs on each axle, regardless of the condition of the counterparts on the opposite side. This practice promotes balanced braking across both wheels, crucial for emergency scenarios. If there’s uneven wear on one side or signs of rust on a disc, inspect the brake calipers for any accumulation of dirt or rust.

When to change the brake pads

When the brake pad lining measures less than 2 mm thick, it’s time for replacement, unless the manufacturer specifies otherwise. How can you detect nearly worn-out pads? Interestingly, even heavily worn linings can still effectively halt the vehicle without compromising braking efficiency.

Indications of Worn Brake Pads

A prevalent signal of thinning pad linings is a metallic squeak, typically caused by a small metal piece affixed to the brake pad plate. This sound serves as a warning to the driver that the pad lining has diminished significantly and should never be disregarded. Modern vehicles often come equipped with electronic sensors for monitoring lining thickness, prompting a dedicated warning light on the dashboard after the pads wear out.

Another indicator of brake pad wear is a decline in brake fluid level. This decrease doesn’t necessarily denote a leak; rather, it occurs as brake pistons extend and displace fluid. Upon installing new pads, the fluid level typically returns to normal. However, it’s crucial to note that brake fluid is highly absorbent of moisture, which lowers its boiling point. Therefore, when replacing brake pads, it’s advisable to assess the fluid level using a gauge (approximately PLN 20-30) and replenish it with fresh fluid if necessary.

Two sides of a brake disc

The development of a flange along the outer rim of a brake disc commonly signals disc wear. This flange forms as the central portion of the disc surface thins due to friction from brake operation. Disc wear can be assessed using a standard slide caliper. Manufacturers typically allow for a slight material loss of approximately 1 mm on each side of the disc.

It’s crucial to note that a decrease in disc thickness isn’t the sole indicator for replacement. It’s essential to also inspect for cracks, corrosion, and discoloration, which can signify metal overheating. Notably, corrosion tends to affect the inner side of the disc, potentially masking issues visible on the exterior. Additionally, a disc might be warped, although this requires a dial gauge for accurate assessment. When replacing discs, it’s imperative to also change the pads simultaneously. Otherwise, the old pad material may damage the smooth surface of the new discs, compromising their performance.

Brake pads lifetime

Ensure you replace your brake pads before they reach their wear limit. Thinning linings are prone to overheating and disintegration, potentially leaving your vehicle incapacitated at unexpected moments. It’s generally recommended to change brake pads when the lining measures less than 3 mm thick. However, the lifespan of new brake pads varies depending on factors such as your driving habits, vehicle weight, driving terrain, and the friction material used on the pads. Typically, high-quality brake pads can last around 50-70 thousand kilometers, while cheaper alternatives may fail after only around 20 thousand kilometers. Considering the relatively brief time required for replacement, it’s not advisable to skimp on quality. Opting for well-known brands like MILES ensures you’re prioritizing safety and reliability.

Brake hose challange

To reach the brake discs, you’ll need to detach the entire brake caliper. Loosening the screws can be challenging, as they often seize due to exposure to high temperatures and rust. Prior to removal, it’s advisable to apply a penetrant to the threads to facilitate loosening. Once the caliper is removed, avoid placing it on the floor or a shelf, as it remains connected to a brake hose. Hanging it directly on the hose is a common mistake that may lead to hose damage or breakage. Instead, suspend the caliper from a suspension element, such as the spring, using a cord or clamp to prevent potential damage to the hose. Additionally, take the opportunity to inspect the condition of the brake hoses. If they appear brittle, stiff, or show signs of cracking, they should be replaced. Consider selecting from the extensive range of MILES hoses to ensure you acquire a high-quality product at a reasonable price.

New installation kit

When replacing brake pads, it’s advisable to also replace the installation kit. Reusing old guides and plates increases the likelihood of improper caliper function, leading to squeaking noises, braking runout, and potentially damaging the new pad lining. Investing in a new installation kit is a cost-effective measure that can prevent significant issues. Additionally, if you observe a brake fluid leak near the piston, it’s recommended to replace the rubber sealing elements that protect the caliper from dirt. All necessary parts can typically be found in your brake repair kit.

Remember to push the brake piston in

When installing new brake pads, it’s wise to include a replacement installation kit. Reusing old guides and plates heightens the risk of caliper dysfunction, resulting in squeaks, braking irregularities, and potential damage to the fresh pad lining. Opting for a new installation kit proves cost-effective, averting potential complications. Moreover, if there’s evidence of a brake fluid leak near the piston, it’s advisable to swap out the rubber sealing elements safeguarding the caliper from debris. These essential components are usually included in your brake repair kit.

Prior to compressing the piston, inspect beneath the gasket where dirt commonly accumulates. Failing to address this debris could result in its entry into the hoses, potentially compromising valve performance. Therefore, it’s crucial to thoroughly clean the gasket area and apply a light coating of specialized brake system lubricant. Additionally, bear in mind that certain vehicles may require connection to a computer or disconnection from the master cylinder before piston compression can be attempted. Neglecting this step could render the task impossible or hazardous.

Cleaning the brake disc before installation

Experiencing reduced braking force following the replacement of brake discs is a common occurrence and should not raise concerns. The new components require a break-in period before achieving optimal performance. A specialized layer applied to ABE pads facilitates a snug fit between the pads and discs, minimizing this break-in period. However, improper brake performance can sometimes result from incorrectly installed discs. Many models come with a protective oil coating on the discs to prevent corrosion during storage, which must be removed before installation using a brake disc cleaner to ensure optimal function. It’s recommended to remove this coating before mounting the discs onto the hub to simplify the process. Certain discs, such as AB Performance, may not require the removal of this protective layer, as indicated on the packaging. Nevertheless, it’s advisable to clean the entire unit thoroughly after completing the installation process.

Final and foremost, is changing brake pads and brake disc by yourself a good idea?

Undertaking the task independently is feasible, provided that everything progresses smoothly and you have the necessary technical resources readily available. However, challenges arise when assessing the condition of guides, replacing pistons, extracting stuck screws, or refurbishing corroded calipers. Incorrect installation can lead to various inconveniences, such as brake runout, squeaking noises, or vehicle veering to one side during braking. Given the relatively modest cost of having brake pads replaced at a professional garage, it’s advisable to entrust this task to experts. They can also conduct inspections of other critical components like wheel bearings, shock absorbers, and brake hoses while addressing your brake pad replacement needs.