Brake Pad Know-How: Pedal Pads & Bike Brakes

A well-maintained braking system is paramount for safety, whether you're navigating the bustling city streets in your car or enjoying a leisurely cycle through the countryside. While the mechanics differ significantly between a car's main braking system and a bicycle's, some fundamental principles of maintenance, and the frustration of a squealing brake, remain universal. This comprehensive guide will first address a specific, often overlooked, car maintenance task: replacing the brake pedal pad. Following that, we'll dive deep into the common causes and solutions for troublesome bike brakes, ensuring your rides are as smooth and silent as they should be.

Replacing Your Car's Brake Pedal Pad

While often mistaken for the more complex task of replacing the friction pads within your car's wheel braking system, changing the brake pedal pad is a straightforward job. This pad, typically made of rubber, provides grip for your foot on the brake pedal itself and can wear out over time, becoming slippery or even falling off. It's a quick fix that contributes to driving comfort and safety.

To remove the existing brake pedal pad from your car's brake pedal, follow these simple steps:

• Locate the brake pedal. On the reverse side of the brake pedal, you will find three ¼-inch head sheet metal screws.
• Carefully remove these three screws.
• Once the screws are removed, slide the brake pad off the pedal by sliding it to the right.

Installation of a new pedal pad is typically the reverse of removal, ensuring it's securely fastened for optimal grip.

Understanding and Fixing Squeaky Bike Brakes

Unlike the simple pedal pad, the actual braking components of a vehicle, whether car or bike, are critical for stopping power. While this article does not delve into the intricate process of replacing a car's primary brake pads and rotors (a task often best left to experienced mechanics or those with proper tools and training), many common issues, particularly the dreaded squeal, can be tackled with some basic bike maintenance. Nothing will ruin an enjoyable bike ride faster than brakes that squeal every time you use them. Let's explore why your bike brakes might be making a racket and how to silence them.

The Squealing Truth: Why Your Brakes Are Noisy

There are a number of causes of squeaky brakes on bicycles. Understanding the root cause is the first step to a quiet ride.

1. New Brakes: New brakes can take a while to bed in. During this initial period, they may squeak until the pads and rotors (or rims) have properly conformed to each other. This is often a temporary issue that resolves with use.
2. Poor Setup/Misalignment: If the brakes have not been set up correctly, they can cause vibration during braking. This vibration, in turn, leads to that irritating squealing noise.
3. Contamination: This is a very common culprit. If grease, oil, or other lubricant coats the rim or disc rotor, it can easily transfer to the brake pads. This contamination significantly reduces their traction and contributes to the horrible squealing noise.
4. Wear and Tear: Over time, brake pads and rotors/rims wear down. This can lead to glazing on disc brake components or a build-up of material on rim brake pads, both causing noise and reduced effectiveness.

Most bike shops will help customers with any problems they’re having, but it’s usually for a fee. Fortunately, nothing described here is overly complicated, so you should be able to do it yourself. At most, you’ll need a clean cloth, some degreaser, and a couple of Allen keys. It all comes under the heading of basic bike maintenance.

Mastering Rim Brake Maintenance

Rim brakes work by clamping pads onto the wheel's rim. They are susceptible to dirt and misalignment.

Dirty Brakes

When you use rim brakes, the blocks (pads) will start to wear down. This process leaves behind metal and rubber residue that can easily mix with other dirt and debris from the road. Over time, this mixture collects on the blocks, leaving the surface of the brakes dirty. This dirt is not only responsible for the squeaking sound but also reduces the effectiveness of braking and increases wear around the rim.

To fix this problem:

• You’ll need to take the wheels off your bike.
• Check for dirt on the brake blocks. Use either a clean cloth or a brush to carefully remove as much dirt and debris as you can.
• Once that’s done, apply some oil-free cleaner to a clean cloth. Clean the brake blocks and both sides of the rims thoroughly.
• If the dirt feels greasy, like it may be oil or lubricant, then you should also use a dedicated degreaser during the cleaning process.
• Once the brakes and rims are clean, re-attach the wheel and check for squeaking.

Misaligned Brakes

Proper alignment of rim brake pads is crucial for quiet and effective braking. There are two main aspects to check: centring and horizontal alignment (toe-in).

• Centring on the Rim: The first thing you should check is if the brake pads are correctly centred on the rim. If they are, you can skip this explanation and proceed to the next part. If they’re not, you need to loosen (but not remove!) a nut on the brake pad. Once this is done, you can move the brake pad into the proper position. Once it’s in place, ensure the left part of the brake pad hits the wheel first and tighten the nut back into place.
• Horizontal Alignment (Toe-In): The second thing to look at is the brake pads’ horizontal alignment, often referred to as 'toe-in'. Brakes are easily bumped against when riding. As a result, instead of the side of the brake closest to the back of the bike hitting the rim first, the pads will either hit the rim all at once, or the front part of the brake pad will hit first. Either of these alignments will cause a squeaking noise when you use the brake. To fix it, you will have to loosen the brake pads as you did before. Then try to realign them so that they’re tilted slightly towards the rear of the bike. If done correctly, the part closer to the back of the bike touches the rim slightly before the rest of the brake pad, preventing the squeal.

Replacements

If you’ve had these brakes a while, or you noticed they were looking very worn during your maintenance, you may want to consider replacing them. As explained above, this won’t do anything at first as new brakes are also prone to squeaking. Once they bed in, though, the squeak should vanish, and more importantly, your brakes will function better. Better brakes means more safety when you hit the road.

Tackling Disc Brake Troubles

Disc brakes operate differently, using pads that clamp onto a rotor attached to the wheel hub. They have their own set of common issues.

You Have Glazed Rotors & Pads

This is a common wear and tear issue for disc brakes. Once you’ve done a lot of miles on your bike, a squealing sound could indicate that you’ve glazed your rotors and pads. In other words, repeated braking has worn your brake pads and rotors smooth. It’s not ideal, but it can be fixed!

To do this, you need to restore roughness to the rotors and pads:

• Get some sandpaper between 100 and 150 grade and lay it on a flat surface.
• Turn the pads face down and rub them against the sandpaper. Keep going until all the glazing is removed and the surface is rough again.
• For the rotors, first clean them with brake cleaner and a clean cloth.
• Next, sand them gently with the sandpaper. Don’t do this all in one direction; start with small circles, then change to up and down and finally side to side. Doing it this way means they will bed-in properly. It will also unevenly scratch the surface, potentially preventing the same problem from happening again.

Dirty Brakes

Unlike rim brakes, disc brake pads and rotors work much closer. A benefit of this is that they are less prone to attracting dirt. Long term, however, the pads can still start to wear, which releases debris. This debris can get caught in the calliper and generate noise.

This fix is slightly different to the one for rim brakes:

• You need to take the wheel off and also remove the brake pads. Depending on the type of bike and the brand of brakes you have, you may need to use long pliers to be able to grab the brake pad.
• Once you’ve got them out, clean the rotors and pads thoroughly with alcohol or a dedicated brake cleaning fluid.
• Put the pads back and make sure you don’t touch the pad’s surface with your fingers as you do it, as this can transfer oils.
• Fasten the wheel back into place and check if it’s still squeaking.

Greasy Pads

If cleaning has not helped, then it’s possible that your brake pads have been contaminated by lubricant or some other greasy substance. Unfortunately, the materials brake pads are made out of makes them prone to absorbing grease, which can reduce their effectiveness and cause the squeak. If your cleaning didn’t help, you could get an oil-free degreaser and try this. If you still have no luck, then replacing them may be your only option.

A Badly Aligned Calliper

A misaligned calliper can cause rubbing and squealing noises, as the pads may not be engaging the rotor evenly or clearing it completely when disengaged.

To check and adjust the alignment of the calliper:

• Loosen the bolts that hold the calliper to the frame or fork and gently wiggle the calliper free so it can move.
• You should then hold down the brake lever firmly. This action will centre the calliper over the rotor with the help of the brake pads.
• Still holding the brake down, tighten the calliper bolts evenly, alternating between them.
• Once done, spin the wheel. If it’s still squeaking, try repeating this step. It may take a couple of goes before the calliper is properly aligned.

Bent Rotor

If you’ve tried realigning the calliper several times and it’s still noisy, then there’s a good chance your bike rotor is bent. Again, this is an easy fix and nothing to worry about.

To diagnose and fix a bent rotor:

• Spin the wheel while looking down through the calliper at the gap between the brake pads and the rotor. It should be obvious when the brake pad touches the rotor as the wheel spins. That is where your rotor is bent.
• Once you’ve located where it’s bent, you can gently bend it back into place. There are dedicated tools for this called truing forks, which are highly recommended for precision.
• Remember to take your time and be gentle; if you bend the rotor the wrong way or damage it, then you may be looking at replacing the rotor, which is an unnecessary expense.
• If you bend it straight and there’s still a squeaking or rubbing noise, then the rotor may just be old and worn. In that case, all you can do is replace the rotor.

Common Brake Issue & Fixes Comparison

Frequently Asked Questions (FAQs) About Brake Maintenance

Q: Why do new brakes on my bike squeak?
A: New brakes often squeak because they need to 'bed in'. This means the brake pads and the braking surface (rim or rotor) need time to wear into each other and create optimal contact. The noise should diminish after a few rides.

Q: Can I use any cleaner on my bike brakes?
A: No, it's crucial to use only oil-free cleaners or dedicated brake cleaning fluids. Household cleaners, especially those with lubricants, can contaminate brake surfaces and worsen squealing or reduce braking performance.

Q: How often should I clean my bike brakes?
A: The frequency depends on your riding conditions and how often you ride. If you frequently ride in wet, muddy, or dusty conditions, more frequent cleaning (e.g., after every few rides) is advisable. If you notice a decrease in performance or an increase in noise, it's definitely time for a clean.

Q: When should I replace my bike brake pads?
A: Replace pads when they are significantly worn down, become hard or glazed, or if they've been severely contaminated by grease that cannot be cleaned off. Rim brake pads often have wear lines indicating when replacement is due.

Q: Is it safe to ride with squeaky brakes?
A: While some squealing might be just annoying (like new brakes bedding in), persistent squealing often indicates an underlying issue like contamination or misalignment. These issues can reduce braking effectiveness and safety, so it's always best to address them promptly.

Q: Can I bend a bent disc rotor back myself?
A: Yes, you can gently attempt to bend a slightly bent rotor back into place using a truing fork or even an adjustable spanner. However, proceed with caution and gentleness. Excessive force can damage the rotor, requiring a costly replacement. For significant bends, professional help is recommended.

Conclusion

From the simple task of replacing a car's brake pedal pad to the more nuanced process of maintaining your bicycle's braking system, keeping your brakes in top condition is essential for both safety and enjoyment. There is a range of reasons that can cause squeaky brakes, and many of them, like your brakes being new, aren’t even a problem and will go away once the brakes bed in. The other causes are easily fixable with a bit of simple maintenance. By understanding the causes of issues like squealing, glazing, and contamination, and armed with the right tools and a bit of patience, you can resolve most common brake problems yourself. Take your time, use the right products, and do the repairs described carefully, and you’ll be out enjoying a peaceful ride in no time.

If you want to read more articles similar to Brake Pad Know-How: Pedal Pads & Bike Brakes, you can visit the Maintenance category.