How To Replace A Brake Disc
Did you know that almost 10% of MOT failures are due to brake disc issues? If you are driving along and hear a horrendous screeching every time you brake, it’s time to have your discs looked at. But, if you want to complete the task yourself, how do you replace a brake disc?
This handy blog will show you how to replace a brake disc, for optimum performance and minimal squeaking. The process is actually a lot simpler than you would assume. However, if you are unsure about the process or encounter any issues along the way, it is always best to consult a professional or specialist. Remember, incorrectly fitted brakes can lead to brake failure, and serious consequences.
So, are you ready to get started?
Things you will need
WD-40® Specialist Penetrant Spray
New brake discs
Jack and jack stands
Lug wrench
Socket wrench
Torque wrench
C-clamp
Step 1
Prepare the Car
Firstly, you will need to prepare your car to ensure the procedure will be completed safely. Park your car on a flat surface and engage the parking brake. Ensure your workspace is clear of any debris or obstructions.
Step 2
Lift the Car
Once your preparation is complete, you need to raise your vehicle. Locate the jacking points indicated in your car’s manual, and use your jack to lift the car off the ground. If possible, secure the car with jack stands to keep it sturdy.
Step 3
Remove the Wheel
Now that your car is raised, it is time to remove the wheel. Removing the wheel will allow access to the brake discs and pads. To detach the wheel, use a lug wrench to loosen the lug nuts on the wheel. Remember, you only need to do this on the wheel of the brake disc you’re replacing. Once the lug nuts are loose, raise the car slightly again, and remove the lug nuts and the wheel.
Step 4
Remove the Calliper
Once you have successfully removed the wheel, you now have access to the inner workings of the car. You will need to locate the brake calliper, which is usually held in place by two bolts. Use a socket wrench to remove the calliper bolts and gently pull the calliper away from the brake disc. If the bolts are seized or rusty, use a spritz of WD-40 Specialist® Penetrant Spray to release them. The innovative formula cuts through rust, seams and tightly-bonded threads to easily saturate and lubricate seized fixings. Once removed, hang the calliper using a wire or bungee cord to prevent strain on the brake hose.
Step 5
Remove the Old Brake Disc
Now that you have removed the callipers, you should have full access to the brake discs and pads. Firstly, lets deal with the discs. Inspect the brake disc fully. You will want to check for any signs of wear and tear, to ensure it is suitable for replacement.
Remove the retaining screws (if any) holding the brake disc in place. If the disc is stuck, saturate the disc in WD-40 Specialist® Penetrant Spray to loosen the fixing, and tap it gently with a rubber mallet. This should effectively release the disc.
Step 6
Install the New Brake Disc
Now that you have successfully removed the disc, it’s time to replace it. With your new disc, gently clean it with WD-40 Specialist® Brake Cleaner, which works to quickly dissolve residual oil, grease, and brake fluid. Then, place the new disc on the hub, ensuring it aligns properly. Then, replace the screws you took out earlier (if any), and tighten them.
Step 7
Re-install the Calliper
Once the brake disc is replaced, you should take the time to assess the brake pads for any wear and tear, and replace them if necessary. Once complete, it’s time to re-install the calliper. To do this, use a C-clamp to compress the brake calliper piston into its housing. Then, slide the calliper over the brake disc, and align it with the brake pads. Finally, using caution to avoid damage to the parts, replace and tighten the calliper bolts. Use a torque wrench for easy installation, but always be sure to follow the manufacturers instructions.
Step 8
Re-install the Wheel
The final step in the process is to re-install the wheel. Before placing the wheel back, take a second to clean the hub surface if needed. Once you are happy, place the wheel back onto the hub and tighten the nuts by hand. Once the wheels are in place, lower the car carefully until the wheel makes contact with the ground. Once safely lowered, use a torque wrench to tighten the nuts to the recommended torque.
Step 9
Test the Brakes
So, now that your brake discs are installed, you will need to test the brakes to ensure the job has been completed correctly. Start the car and pump the brake pedal a few times to restore pressure. In a safe place, take a short drive, slowly applying the brakes to ensure they engage smoothly and without any issues.
Remember, if you’re not confident or comfortable performing this task yourself, it’s always best to seek assistance from a qualified mechanic. Safety first.
Wheely good stuff!
So, there you have it. You now know how to successfully replace a brake disc. Great job! For more information on the Specialist range and how it can help you during your day-to-day tasks, take a look at our Specialist Range.
The uses shown and described for WD-40 Multi-Use Product were provided to WD-40 Company by the users themselves. These uses haven’t been tested by WD-40 Company and do not constitute a recommendation of suggestion for use by WD-40 Company. Common sense should be exercised whenever using WD-40 Company products. Always follow the instructions and take heed of any warnings printed on the packaging.
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