Keeping your brake fluid fresh is one of the most important maintenance tasks you can do for your CFMOTO 450 MT. Brake fluid absorbs moisture over time, which lowers its boiling point and reduces braking performance, sometimes significantly. Whether you are a weekend trail rider or a daily commuter, understanding how to replace and bleed your brake fluid correctly keeps your braking system safe, responsive, and reliable. This guide walks you through everything you need to know, from choosing the right fluid to avoiding the most common mistakes.
What type of brake fluid does the CFMOTO 450 MT use?
The CFMOTO 450 MT uses DOT 4 brake fluid. This is the manufacturer-specified fluid for both the front and rear braking systems on this model. DOT 4 offers a higher boiling point than DOT 3, making it better suited for the demands of modern motorcycle braking, particularly under harder or more frequent braking conditions.
It is important to use the correct specification and not mix fluid types. DOT 3 and DOT 4 are glycol-based and technically miscible, but mixing them will lower the overall boiling point of the fluid in your system. DOT 5, on the other hand, is silicone-based and completely incompatible with DOT 4 systems. Using DOT 5 in a system designed for DOT 4 can cause seal damage and brake failure. Always check the cap on your brake reservoir, which typically lists the required fluid type, and confirm against your owner’s manual before purchasing.
When buying DOT 4 fluid, choose a reputable brand and make sure the bottle is sealed and recently purchased. Brake fluid is hygroscopic, meaning it absorbs moisture from the air. An open or old bottle may already be contaminated before it ever reaches your bike.
How often should you change brake fluid on a CFMOTO 450 MT?
You should change the brake fluid on your CFMOTO 450 MT every two years or every 15,000 to 20,000 kilometres, whichever comes first. This interval aligns with general motorcycle maintenance recommendations for DOT 4 fluid and accounts for the gradual moisture absorption that degrades performance over time.
In practice, the actual condition of your fluid matters more than a fixed schedule. Brake fluid that has turned dark brown or amber is a clear sign it needs replacing, regardless of mileage. Fresh DOT 4 fluid is typically light yellow and nearly transparent. If yours looks significantly darker, do not wait for the next scheduled interval.
Riders who use their CFMOTO 450 MT in demanding conditions, such as frequent off-road riding, mountain passes, or track days, should consider changing the fluid more frequently. High heat cycles accelerate moisture absorption and degrade the fluid faster. Similarly, if your bike has been sitting unused for an extended period, it is worth testing or replacing the fluid before getting back on the road.
What tools do you need to replace CFMOTO 450 MT brake fluid?
To replace the brake fluid on a CFMOTO 450 MT, you need a small set of basic tools that most riders either already own or can find at any motorcycle or automotive shop. Having everything prepared before you start makes the job cleaner and faster.
- Fresh DOT 4 brake fluid (at least 200 ml per circuit, front and rear separately)
- Clear plastic tubing (to fit over the bleed nipple, typically 5 mm or 6 mm inner diameter)
- Small container or jar to collect old fluid
- 8 mm or 10 mm ring spanner or box wrench for the bleed nipple (check your specific nipple size)
- Phillips head screwdriver to remove the reservoir cap screws
- Clean rags or paper towels to protect painted surfaces and catch spills
- Brake fluid syringe or turkey baster to remove old fluid from the reservoir (optional but helpful)
- Nitrile gloves to protect your skin, as brake fluid is corrosive to paint and irritating to skin
A vacuum bleeder kit is not strictly necessary but can make the bleeding process much easier if you are working alone. These are inexpensive and widely available. If you prefer a pressure bleeder, that works well too, though it requires more setup. For most riders, the traditional gravity or push-bleed method with a helper is perfectly effective.
How do you replace brake fluid on a CFMOTO 450 MT step by step?
To replace the brake fluid on a CFMOTO 450 MT, you remove the old fluid from the reservoir, refill with fresh DOT 4, and then bleed the system until clean fluid flows through. The process takes roughly 30 to 60 minutes per circuit and should be done with the bike on a stable stand.
- Position the bike upright on a centre stand or paddock stand so the reservoir is level.
- Protect the surrounding area by placing clean rags over the fuel tank, painted bodywork, and any rubber components. Brake fluid strips paint quickly.
- Remove the reservoir cap by undoing the two Phillips screws on the master cylinder. Lift off the cap and diaphragm carefully.
- Remove old fluid from the reservoir using a syringe or turkey baster. Extract as much of the old fluid as possible without letting the reservoir run completely dry, as air entering the system complicates bleeding.
- Refill the reservoir with fresh DOT 4 fluid to just below the maximum line.
- Attach your bleed tube to the bleed nipple at the brake caliper. Place the other end into your collection container.
- Open the bleed nipple approximately a quarter to half turn using your spanner.
- Pump the brake lever or pedal slowly and steadily. Watch the fluid flowing through the tube. Keep topping up the reservoir as the level drops, never letting it empty.
- Continue until fresh, clear fluid flows consistently through the tube with no air bubbles visible.
- Close the bleed nipple firmly before releasing the brake lever, then top the reservoir to the correct level.
- Refit the diaphragm and cap, tighten the screws, and wipe down all surfaces to remove any spilled fluid.
- Test the brake feel before riding. The lever or pedal should feel firm and progressive, not spongy.
Repeat this process for the rear brake circuit separately. The front and rear systems are independent on the CFMOTO 450 MT and must each be bled individually.
How do you bleed the brakes on a CFMOTO 450 MT?
To bleed the brakes on a CFMOTO 450 MT, you open the bleed nipple at the caliper, pump fluid through the system to push out air and old fluid, and close the nipple before the lever or pedal returns. The goal is to eliminate any air trapped in the brake lines, which causes a soft or spongy feel.
The push-bleed method (with a helper)
This is the most reliable method for most riders. One person slowly pumps the brake lever or pedal while the other opens and closes the bleed nipple in sequence. The key rule is always to close the nipple before the lever reaches the end of its stroke or is released. If the nipple is open when the lever returns, it draws air back into the system.
The gravity bleed method (solo)
Open the bleed nipple slightly and let gravity pull fluid through the system on its own. This is slower but works well for a straightforward fluid change when there is no major air in the system. Keep a close eye on the reservoir and top it up regularly to prevent air from entering at the top.
The vacuum bleed method (solo)
Attach a vacuum bleeder to the nipple and draw fluid through manually. This is the fastest solo method and works well for the CFMOTO 450 MT. Be aware that cheap vacuum bleeders can draw air past the nipple threads, which can make it appear as though there is still air in the system when there is not. If you see tiny, consistent bubbles that do not stop, this is likely the cause.
Regardless of method, always finish by pressing the brake lever or pedal firmly several times with the nipple closed to confirm the feel is solid and consistent before riding.
What are the most common mistakes when replacing motorcycle brake fluid?
The most common mistakes when replacing motorcycle brake fluid are letting the reservoir run dry, spilling fluid on painted surfaces, and failing to close the bleed nipple before releasing the lever. Each of these can cause problems ranging from minor inconvenience to a genuinely dangerous brake system.
- Letting the reservoir empty: This introduces air directly into the master cylinder, which is difficult to remove and can require a full system purge. Keep the reservoir topped up throughout the entire process.
- Releasing the lever with the nipple open: This draws air back into the caliper, undoing your work. Always close the nipple first, then release.
- Spilling fluid on paintwork or rubber: DOT 4 is highly corrosive to paint and can swell rubber seals. Work carefully and wipe up any spills immediately with clean water.
- Using old or contaminated fluid: Brake fluid from a previously opened bottle absorbs moisture from the air. Always use fresh fluid from a sealed container.
- Mixing fluid types: Adding DOT 3 or DOT 5 to a DOT 4 system degrades performance or, in the case of DOT 5, can cause seal failure. Confirm the correct specification before starting.
- Not testing the brakes before riding: Always pump the lever and pedal several times after the job to confirm a firm, consistent feel before taking the bike on the road.
- Overtightening the bleed nipple: Bleed nipples are small and can strip or snap easily. Tighten them firmly but gently. A snapped nipple turns a simple maintenance job into a much larger repair.
Taking your time, staying organised, and keeping the reservoir topped up throughout the process eliminates most of these issues before they happen.
How TFX Suspension supports your CFMOTO 450 MT
Brake fluid maintenance is just one part of keeping your CFMOTO 450 MT performing at its best. If your braking is solid but your suspension still feels vague, unsettled, or poorly matched to your riding style, that is where we come in.
At TFX Suspension, we specialise in high-performance, custom-tuned suspension systems built specifically for riders who refuse to accept the limitations of factory setups. Our philosophy is simple: do not settle for standard. Here is what we offer for adventure and dual-sport riders like you:
- Custom-tuned suspension matched to your weight, riding style, and terrain, whether you are loaded up for a multi-day tour or riding light on technical trails
- Dedicated service and revision for existing suspension components, restoring performance and extending the life of your setup
- Modular, serviceable systems that can be adjusted as your riding evolves, rather than replaced entirely
- Expert advice and support from a team that rides and understands the demands you put on your bike
If you want to explore what a properly tuned suspension can do for your CFMOTO 450 MT, visit our suspension shop to browse our range, check out our service and tuning options, or get in touch with us directly to discuss your specific setup. You can also find more guides and technical insights on the TFX Suspension blog, or head to the TFX Suspension homepage to learn more about who we are and what we build.
Frequently Asked Questions
How do I know if there is still air in my brake lines after bleeding?
The clearest sign of trapped air is a spongy, soft, or inconsistent brake lever or pedal feel — one that compresses further than normal before the brakes engage. After completing the bleed, pump the lever or pedal firmly several times with the bleed nipple closed. If the feel is firm and consistent from the first pull or push, you are good to go. If it still feels soft or improves with repeated pumping, there is likely still air in the system and you need to repeat the bleeding process, paying close attention to keeping the reservoir topped up throughout.
Can I do a brake fluid change on my CFMOTO 450 MT completely on my own, without a helper?
Yes, absolutely. Both the gravity bleed and vacuum bleed methods are designed for solo use and work well on the CFMOTO 450 MT. A vacuum bleeder kit is the most efficient solo option and can be picked up inexpensively from most motorcycle or automotive shops. If you go the gravity bleed route, just be patient, check the reservoir level frequently, and give the fluid enough time to work its way through the system on its own. The main thing to avoid when working alone is letting the reservoir run dry, so keep it topped up throughout the entire process.
What should I do if brake fluid gets on my paintwork during the job?
Act immediately — DOT 4 brake fluid is highly corrosive to paint and can cause visible damage within minutes if left to sit. Flush the affected area thoroughly with clean water as soon as possible, then wipe it dry with a clean cloth. Do not use a dry cloth to wipe it off first, as this can spread the fluid and make the damage worse. The best prevention is to lay clean rags over your fuel tank, bodywork, and any rubber components before you start, and to work slowly and carefully when handling the fluid.
My brake lever still feels a bit soft even after bleeding — what else could be causing this?
If you have bled the system thoroughly and are confident there is no air remaining, a soft lever can also be caused by worn or deteriorated brake pads, a partially seized or sticky caliper piston, or a master cylinder that is beginning to fail internally. Inspect your brake pads for wear and check that the caliper pistons move freely and retract properly. If the master cylinder feels inconsistent or the lever gradually sinks under sustained pressure, the internal seals may need attention. For persistent issues, it is worth having a qualified mechanic inspect the full brake system before riding.
Is it worth upgrading to a higher-spec brake fluid than standard DOT 4 for more demanding riding?
If you regularly ride in high-heat conditions — such as track days, long descents, or aggressive off-road use — it is worth looking at high-performance DOT 4 fluids, sometimes labelled as DOT 4 Plus or Super DOT 4. These are formulated with a higher dry and wet boiling point than standard DOT 4 while remaining fully compatible with your CFMOTO 450 MT’s existing seals and system. They offer a meaningful safety margin under hard braking without requiring any changes to your hardware. Just confirm the product meets or exceeds the DOT 4 specification and is from a reputable manufacturer.
How should I dispose of the old brake fluid I drain from the system?
Old brake fluid should never be poured down the drain, into the soil, or mixed with other fluids for disposal — it is a hazardous chemical waste product. Collect it in a sealed container, such as the empty bottle your new fluid came in, and take it to your local council recycling centre, automotive workshop, or hazardous waste disposal facility. Many motorcycle and car parts shops also accept small quantities of used fluid for proper disposal. Handling it responsibly is straightforward and keeps both you and the environment safe.
Do I need to bleed the brakes if I am only topping up the fluid level, not doing a full change?
No — if you are simply topping up a low reservoir without opening any bleed nipples or brake lines, you do not need to bleed the system afterwards. Just remove the reservoir cap carefully, add the correct DOT 4 fluid to bring the level up to the maximum line, refit the diaphragm and cap, and you are done. That said, a consistently low fluid level is worth investigating, as it can indicate worn brake pads (normal) or a slow leak somewhere in the system (not normal). If your pads are not worn and the level keeps dropping, have the system inspected before riding.
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