Due to current circumstances, a question is frequently asked: Can a bicycle freeze? And if so, what freezes on the bike and what can be done about it? Here is our guide for frozen brakes on a bicycle:
From the bicycle gears, dampers, or suspension fork, there are occasional reports about icy problems. Truly unlucky people find their bike buried under a thick layer of ice and then have to take the bus. Indeed, it happens repeatedly that bicycle brakes freeze – and this becomes very dangerous! Because water freezes in the brake cables, you can't tell from looking at the bicycle that something is wrong. It rides as usual. The first time you try to brake, you realize the stoppers don't respond. Here, frozen bicycle brakes are in focus and you will learn how to prevent this problem and how to thaw them if necessary.
It's the stuff horror reels are made of: Someone, bundled up in winter weather, gets on their bike and takes off. Then the shock – at the first red light, they need to brake, and the brake... fails! A crash is inevitable.
Some commuters are surprised in winter by frozen brakes on their city bike, cargo bike, or trekking bike . But even on a performance bike, on road bikes, gravel bikes, or MTBs, the brakes can freeze. No matter what bike you ride, it is possible for the brakes to freeze. Here you will learn how to avoid the frosty surprise and how to free the brake from ice and frost if necessary.
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Our tip: Please test your brakes and gears at sub-zero temperatures before you set off! Without gears, you can at least stop and get off. If you start rolling downhill or are near an intersection and then realize the brake is frozen, it's too late! |
Prevention is better – this is how you prevent your bicycle brakes from freezing
How can you prevent the brakes on your bicycle from freezing? Quite simply, the best solution is, of course, to protect the bicycle from frost!
Fortunately, it is usually not the bicycle brake itself that is frozen. Most often, the brake cable is frozen in the outer casing. Image © Trek
A warm spot prevents frozen brakes on the bicycle
A bicycle cellar, the garage, or the hallway are possible frost-free bicycle parking spots. If the bicycle is not supposed to stand around in the apartment all day, it is sufficient to bring it inside in the evening. Overnight, the brake lines thaw, then you can ride to work with the bike in the morning without worry. However, the temperature difference should not be too large, cool and frost-free is ideal.
If it is cold during the day, you might also be able to park your bicycle protected at the workplace. Is there a frost-free underground garage or is the bicycle allowed to stand in the basement of the office building as an exception? This way, you can come home after your workday without frozen bicycle brakes. At least you can try to park your bicycle wind-protected or in the sun.
Park your bike dry!
You should also protect your bicycle from moisture! Unfortunately, a white, cold winter has become rare in most parts of Germany, with temperatures fluctuating around the freezing point; snow, sleet, and rain alternate. When the weather fluctuates between frost and moisture, frozen brakes are a common problem. Moisture especially affects mechanical brakes .
It can already help if you park your bicycle under a roof, or you can cover it.
Especially in winter, a bicycle needs to be cleaned from time to time, as grit and salt are harmful to the drivetrain, frame, and brakes. After washing, your bicycle should dry well and be lubricated to prevent everything from freezing during the next frost.
Don't forget the bicycle check!
A well-maintained bicycle causes less trouble. There are two points that are particularly important here if you don't want to deal with frozen brakes in winter:
- You should not miss the annual bike check. Brake housings wear out, become brittle, or develop cracks. Then moisture has an especially easy time. Moisture can accumulate in the Bowden cable and freeze at temperatures below 0°C. During the annual bicycle service, a leaky brake housing should be noticed and replaced.
- If your bicycle is well lubricated or oiled , it becomes less susceptible to frost because water freezes, oil and grease do not. Of course, you shouldn't just oil indiscriminately, but if connections and wear parts are well greased, they are better protected from moisture and ice. More on the topic Bicycle Lubricants can also be found in the Bike Blog.
Is my bicycle brake really frozen?
You want to get on your bike in the morning and ride off, but the brake won't move. Is it broken or is it frozen? If your bike has spent the night outside in the cold, it's quite possible that moisture has frozen in the brake lines. Then the brake lever can no longer move the caliper.
> Was it particularly cold?
> Did your bike's brake work perfectly just before?
> Was the bike perhaps wet before the big freeze hit?
Then hopefully nothing is broken, you can thaw the bicycle brake.
However, you should also take a close look at your bike. Is the brake undamaged? If the bike has fallen over or some prankster has tampered with it, it may be that the brake is simply broken . Perhaps new brake pads or a brake service are due, you should occasionally check the wear.
Frozen brake lines on the bicycle
You have made sure that nothing on your brakes is damaged or misaligned. They are actually frozen. How can this be?
There are different brake systems on bicycles that can present their owners with different problems in winter. In most cases, it is not the brakes themselves that freeze, but rather condensation freezes in the brake line and prevents the brake cable from moving. This problem only occurs with mechanical bicycle brakes , hydraulic brakes are usually safe from frost.
Mechanical bicycle brakes are frozen
In a mechanical bicycle brake , a brake cable provides deceleration. In a “brake housing” (= a thin tube) there is a wire (“Bowden cable”) that transmits the movements of the brake lever to the brake. Due to material aging and the friction that the cable causes inside the housing, brake housings become leaky over time. Then water can penetrate and the brake cable freezes solid in sub-zero temperatures. The connections between the brake cable and the brake lever or between the cable and the brake itself can also be leaky.
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✅ Here, a regular bicycle check ensures safety! During the service, a leaking brake sleeve should be noticed and replaced. |
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✅ If your bicycle is always kept dry, the risk of waterlogged brake cables is lower. |
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✅ There is also the tip to additionally seal the ends of the brake cables so that no water can penetrate. This can work well at the upper end of the cables (at the handlebars), but it becomes more difficult at the lower end. You must definitely ensure that the function of the brake is not impaired! |
Here you see the cable protruding from the sleeve. Water in the brake sleeve can freeze and immobilize the Bowden cable, and thus the bicycle brake. Image © Title MBT
Can bicycle disc brakes freeze?
Disc brakes come in two different types – mechanical or hydraulic.
With a mechanical disc brake the Bowden cable can freeze.
Hydraulic bicycle brakes are filled with mineral oil or DOT brake fluid. They are a closed system, and where no water can penetrate, nothing can freeze. So goes the theory. However, there are reports of failing hydraulic brakes because in extreme cold, the rubber seals can harden and thus make the brakes stiff. In particularly cold temperatures, the pistons may not return to the starting position – and the brake remains engaged. But hydraulic bicycle brakes filled with mineral oil should not freeze. DOT brake fluid can "absorb water," but it must be regularly replaced anyway before it becomes a hazard.
Bicycle rim brakes are frozen
Rim brakes are mostly mechanical brakes, here a wire = Bowden cable in a sleeve transmits the braking movement. Water in the brake sleeve can freeze, thus freezing the bicycle brake. You can read further below on how to thaw the brake in this case.
With rim brakes, you should also consider 2 points in winter:
- The brake pads are made of rubber, hence the name “brake rubbers”. Rubber can harden at cold temperatures, which changes the braking characteristics of the bike. Start off cautiously and test the brakes on a flat surface so you know how they react.
- Cold or frost can make the contact surface of the brakes on the side of the rims slipperier. Your braking distance will then be longer, and you should test this right at the start of your ride.
Special case cargo bike
Some cargo bikes or cargobikes have a parking brake. Here, the bike's brake lever has a button or lever that keeps the brake permanently applied. This is very practical because these heavy bikes stand securely and reliably in place. However, you should not activate this parking button or lever in frost, as the permanently applied brake can not only freeze, the brake pads can stick to the brake disc!
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✅ You should not park a cargo bike with the parking brake engaged in frost! |
How to thaw frozen brakes on a bicycle
There are different tricks that can help you if your bicycle brake is frozen. Here are the common solutions:
- The most popular method to get frozen bicycle brakes working again is nothing but hot air – with a hairdryer the shock-frozen brake quickly warms up again. But not too hot and not too close, after all, the casing is made of rubber.
- Warm water is often recommended . But this method should be used with caution. Warm water may make the frozen brake temporarily operable again, but it can freeze even worse afterwards due to the moisture! Instead of pouring hot water over the frozen bicycle parts, it's better to dip a cloth or towel in warm water and wrap the frozen parts in it.
- Warm water in a bag can help thaw the brake lines piece by piece. It requires some patience, but if the hairdryer's cord is too short, you should try this method.
- Do you know hand warmers? If it is not too cold and not much liquid is frozen in the cables, you can try using them.
- If your bicycle brake has thawed but still contains water, it will freeze again at the next opportunity. Let your bike thaw and dry first, and then let it stand for a while in a warm place, so the moisture can evaporate from the brake cables. With some luck, it will not freeze again.
- In the case of hardened sealing rubbers On a cold hydraulic disc brake, warming and waiting is the safest method.
Grab the hairdryer, you can thaw frozen Bowden cables in the brake lines with it. Image © Element5 Digital on Unsplash
Thaw frozen bicycle brakes with de-icer?
This tip is often spread on the internet: If bicycle brakes are frozen, they can be thawed with door lock de-icer. In any case, you can thaw your bike lock with de-icer spray. But whether the mixture is suitable for your mechanical brakes is hard to say because you need to fill the outer casing of the brake line with the mixture for this type of problem-solving. In case of doubt, you should definitely ask a bicycle workshop whether and how you can thaw the brakes on your bicycle with de-icer fluid.
Safe through the winter with the bicycle
Ensuring well-functioning brakes is the most important building block in terms of bicycle safety, and it doesn't really depend on the season. But especially in winter, well-maintained brakes are particularly important. You can also do more to be well-prepared for the unfavorable weather conditions of winter. Winter tires for the bike are a good start. Here in the Bike Blog, you will find a post that explains the advantages and disadvantages of different bicycle tires .
Additionally, you will find lots of information on
- Bicycle clothing for winter
- Cleaning & maintaining your bicycle: Keep it clean through winter in 5 steps
- Winter with the bicycle – Finally safe through ice and snow
- Bicycle storage in winter
And of course helmet on, then you have done everything for your safety.
Title image: Mohammed Abubakr on Pexels
