22/07/2005
Your Guide to Replacing Parking Brake Pads
The parking brake, also known as the handbrake or emergency brake, is a crucial safety feature in any vehicle. While often overlooked, its proper functioning is paramount, especially when parking on inclines or in emergency situations. Over time, like any other braking component, parking brake pads can wear out, leading to reduced effectiveness. Replacing them might seem like a daunting task, but with the right knowledge and tools, it's a manageable DIY job. This comprehensive guide will walk you through the process, from identifying the signs of wear to the final reassembly, ensuring you can confidently maintain this vital part of your car's braking system.
Signs Your Parking Brake Pads Need Replacing
Before diving into the replacement process, it's important to recognise when your parking brake pads are nearing the end of their lifespan. Several indicators can signal a need for attention:
- Reduced Holding Power: The most obvious sign is that your parking brake doesn't hold the vehicle as firmly as it used to, especially on hills.
- Grinding or Scraping Noises: If you hear unusual noises when applying or releasing the parking brake, it could indicate worn-out pads or debris caught in the mechanism.
- Sticking: The parking brake might feel stiff or become difficult to release completely.
- Visual Inspection: If you can access the parking brake mechanism, a visual inspection might reveal significantly worn or damaged pads.
Tools and Materials You'll Need
To successfully replace your parking brake pads, gather the following tools and materials:
- New parking brake pads (ensure they are the correct ones for your vehicle make and model)
- Jack and jack stands
- Wheel chocks
- Lug wrench
- Socket set and ratchet
- Wrench set
- Pry bar or flathead screwdriver
- Wire brush
- Brake cleaner
- High-temperature brake lubricant
- Torque wrench
- Gloves and safety glasses
Step-by-Step Replacement Process
Follow these steps carefully to replace your parking brake pads:
1. Prepare the Vehicle
Safety is paramount. Begin by parking your vehicle on a level surface and engaging the standard brakes. Place wheel chocks securely behind the wheels that will remain on the ground to prevent any accidental rolling. Loosen the lug nuts on the wheel you'll be working on, but do not remove them yet.
2. Jack Up the Vehicle and Remove the Wheel
Using your jack, lift the vehicle at the designated jacking point for the wheel you're accessing. Once the wheel is slightly off the ground, place a jack stand securely under the vehicle's frame for support. Lower the jack until the vehicle rests firmly on the jack stand. Now, you can completely remove the lug nuts and take off the wheel.
3. Access the Parking Brake Mechanism
The parking brake mechanism can vary between vehicles. In many modern cars, the parking brake operates independently or is integrated into the rear brake caliper. You might need to remove the brake caliper to access the parking brake shoes or pads. If your vehicle has a drum-in-hat parking brake system, you'll need to remove the brake drum.
If the parking brake is integrated into the rear caliper:
- Locate the caliper bolts. These typically hold the caliper to the caliper bracket.
- Remove the caliper bolts using the appropriate socket and ratchet.
- Carefully slide the caliper off the rotor. You may need to gently pry it to free it. Support the caliper with a piece of wire or a bungee cord to avoid stressing the brake line.
- You should now see the parking brake pads, which are usually small shoes that sit inside the caliper or a separate drum assembly.
If your vehicle has a drum-in-hat system:
- Locate the small retaining clip or screw that holds the brake drum onto the hub. You might need to rotate the drum to access this.
- Carefully tap the drum with a rubber mallet or the handle of your screwdriver to loosen it.
- Once the drum is off, you'll see the parking brake shoes.
4. Remove the Old Parking Brake Pads/Shoes
Once you have access, you'll need to remove the old pads or shoes. They are usually held in place by springs and clips. Use a pry bar or screwdriver to carefully disengage the retaining clips and springs. Note how the old pads are fitted, as you'll need to replicate this for the new ones. It's a good idea to take photos as you disassemble to help with reassembly.
5. Clean the Area
Before installing the new components, it's essential to clean the surrounding area. Use a wire brush to remove any rust, dirt, or old brake dust from the caliper bracket, mounting points, and any other accessible surfaces. Spray the components with brake cleaner and allow them to dry completely. A clean surface ensures proper fitment and function of the new pads.
6. Install the New Parking Brake Pads/Shoes
This is where the information provided becomes critical. Following the correct procedure is essential for safety and performance.
Assembly Steps:
- Shim Installation: Place the new shim onto the caliper support. The shim helps to reduce noise and vibration.
- Brake Pad Assembly: Position the new brake pad assembly. Ensure that if your pads have a wear indicator, it is correctly oriented. The note provided states: "Install the brake pad assembly (with wear indicator) to the inner side of the brake disc, making sure that the wear indicator is located on the top." This is a crucial detail for proper function and audibility when the pads wear down.
- Clip Attachment: Secure the brake pad assembly and shim with the retaining clip. This clip holds everything in place.
- Tighten the Lock Pin: Insert and tighten the lock pin to the specified torque. This is a critical step for ensuring the components are securely fastened.
Tightening Torque Specifications:
The torque specifications are vital for a secure and safe installation. Always use a torque wrench to achieve the correct tightness. The provided specifications are:
| Region | Tightening Torque (N·m) |
|---|---|
| Russia | 44 ± 5 N·m |
| Europe | 74 ± 10 N·m |
It is imperative to use the torque specification relevant to your region or vehicle manufacturer's recommendations. Overtightening can damage components, while undertightening can lead to insecure fitting and potential failure.
7. Reassemble Brakes and Wheel
If you removed the brake caliper, slide it back over the new pads and rotor. Reinstall and tighten the caliper bolts to the manufacturer's specified torque. If you removed a brake drum, slide it back onto the hub and secure it with the retaining clip or screw.
Mount the wheel back onto the hub and hand-tighten the lug nuts. Lower the vehicle off the jack stand, and then use the lug wrench to tighten the lug nuts in a star pattern to ensure even pressure. Once the vehicle is fully on the ground, use the torque wrench to tighten the lug nuts to the manufacturer's specified torque.
8. Test the Parking Brake
Before driving, it's essential to test the parking brake. While the vehicle is still stationary, apply the parking brake firmly. You should feel a good amount of resistance. Then, gently try to drive forward or backward to ensure the brake is holding the vehicle securely. If it feels weak or doesn't engage properly, re-check your work and the torque settings.
Frequently Asked Questions (FAQs)
Q1: How often should parking brake pads be checked?
It's recommended to have your parking brake system inspected annually as part of your regular vehicle maintenance or every 12,000 miles, whichever comes first. However, if you notice any of the signs mentioned earlier, it's best to check them sooner.
Q2: Can I use regular brake pads for my parking brake?
No, you should always use pads specifically designed for parking brakes. They are made with different materials that provide the necessary friction and heat resistance for this specific application.
Q3: What happens if I don't replace worn parking brake pads?
Worn parking brake pads can lead to a loss of holding power, increasing the risk of your vehicle rolling away when parked, especially on inclines. In some cases, severely worn pads can also damage other braking components.
Q4: Is it safe to drive with a faulty parking brake?
No, it is not safe to drive with a faulty parking brake. It's a critical safety system, and its malfunction significantly compromises your vehicle's safety and the safety of others.
Conclusion
Replacing parking brake pads is a vital maintenance task that ensures your vehicle's safety and reliability. By understanding the signs of wear, having the right tools, and following these detailed steps, you can successfully perform this repair. Remember to always prioritise safety, double-check your work, and adhere to the specified torque settings. A well-maintained parking brake system gives you peace of mind, knowing your vehicle is secure when parked.
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