22/04/2016
Many a car owner, when faced with the sight of corroded brake pipes, might wonder if a liberal application of grease is the answer to their problems. After all, grease is a lubricant, and it's often used to protect metal from the elements. However, when it comes to the intricate and safety-critical braking system of your vehicle, the question of whether to grease brake pipes is not as straightforward as it might seem. In fact, as we'll explore, it's generally a practice to be avoided. This article will delve into why greasing brake pipes can be detrimental to your vehicle's performance and safety, and what the recommended alternatives are.
The Dangers of Greasing Brake Pipes
While the intention behind greasing brake pipes might be to prevent rust and corrosion, the reality is that this can introduce a host of new and potentially more dangerous issues. The primary concern revolves around the integrity of the braking system itself. The brake pipes are responsible for carrying the hydraulic fluid that actuates your brakes. Any compromise to their structure or the fluid within them can have catastrophic consequences. One significant problem with applying grease to brake pipes is that it can mask underlying issues. If the pipes are already corroded, applying grease might make them look better temporarily, but it does nothing to address the structural weakness. This can lead to a false sense of security, with the driver unaware of the imminent danger. Furthermore, grease can attract dirt and road debris, creating an abrasive paste that can actually accelerate wear and tear on the pipes and their fittings. Another critical point is how grease can interact with the rubber components of the braking system, such as brake hoses and seals. Many types of grease are petroleum-based, and petroleum products can degrade rubber over time, causing it to swell, soften, or crack. This can lead to leaks and, ultimately, brake failure. The hydraulic fluid itself is specifically formulated to be compatible with the rubber seals within the brake system; introducing an incompatible substance like grease can have severe repercussions.
As one contributor noted, "I won't grease brake pipes either, change them when they are corroded." This sentiment highlights a crucial aspect of brake pipe maintenance: replacement is often the only truly effective solution when corrosion becomes apparent. Brake pipes are typically made of steel, often copper-nickel or a steel tube with a protective coating. Over time, especially in environments where roads are salted during winter, this protective layer can wear away, exposing the metal to moisture and leading to rust. When brake pipes corrode, they can develop pinholes or become thin and weak, risking a rupture under the high pressure of the braking system. Greasing might temporarily seal small perforations, but it's a precarious fix. The pressure exerted during braking could easily overcome the grease, leading to a sudden loss of brake fluid and stopping power. The phrase, "another problem with greasing the pipes is that they could be well rotten in the clips," is particularly insightful. Brake pipes are often secured to the vehicle chassis or bodywork with clips. If the pipes are corroded and weakened within these clips, the grease can prevent proper inspection. A mechanic might not notice the extent of the damage because the grease obscures the true condition of the metal. In such a scenario, the advisory would be "dangerous," and the system would be marked as such.
What About Engine Oil?
The question of whether to spray engine oil on brake pipes is another common query, often stemming from the same desire to combat corrosion. However, engine oil, like many greases, is a petroleum-based product and carries the same risks. It can degrade rubber components, attract dirt, and potentially interfere with the proper functioning of the braking system. Engine oil is designed for lubricating internal engine parts, not for external protection of brake lines. Its viscosity and composition are not suitable for this purpose. While it might offer a temporary barrier against moisture, the long-term consequences of its use on brake pipes are overwhelmingly negative. It's vital to remember that the braking system is a closed hydraulic system, and introducing foreign substances can have unpredictable and dangerous outcomes.
The Best Approach: Inspection and Replacement
So, if greasing and oiling are not the answer, what is the correct way to maintain your brake pipes? The most effective approach is regular inspection and timely replacement.
- Regular Inspections: During routine servicing, it's essential for your mechanic to visually inspect all brake pipes for signs of corrosion, damage, or leaks. Pay close attention to areas where pipes are exposed to the elements or where they pass through protective clips.
- Early Detection: Look for any signs of rust, flaking metal, or dampness around the brake pipes. Even minor surface rust should be a cause for concern and warrant a closer look.
- Professional Replacement: When corrosion is evident, or if there's any doubt about the integrity of a brake pipe, it should be replaced by a qualified mechanic. This often involves replacing the entire length of the pipe to ensure a consistent and reliable repair.
- Quality Parts: Ensure that replacement brake pipes are made from high-quality materials, such as copper-nickel alloy, which offers excellent corrosion resistance compared to standard steel pipes.
Brake Pipe Material Comparison
To better understand the importance of quality materials, consider this brief comparison:
| Material | Pros | Cons |
|---|---|---|
| Steel (coated) | Lower initial cost | Prone to corrosion if coating is breached; can be difficult to bend without kinking |
| Copper-Nickel (Cu-Ni) | Excellent corrosion resistance; easier to bend and flare; longer lifespan | Slightly higher material cost |
Choosing copper-nickel brake pipes for replacement is often a wise investment in the long-term safety and reliability of your braking system.
Common Misconceptions and FAQs
Let's address some frequently asked questions regarding brake pipe maintenance:
Q1: Can I paint my brake pipes to stop them from rusting?
A1: While painting might offer a cosmetic improvement and a very slight barrier, it's not a substitute for proper material or replacement. Like grease, paint can chip or crack, allowing moisture ingress, and it can also mask developing corrosion. It's not a recommended long-term solution.
Q2: What is the best way to clean corroded brake pipes?
A2: If the corrosion is superficial and the pipe is structurally sound, a wire brush can be used to clean the surface. However, it's crucial to then inspect the pipe thoroughly for any signs of thinning metal or pitting. If there's any doubt, replacement is the safest option. Do not use harsh chemicals or solvents as they could damage surrounding components.
Q3: How often should brake pipes be inspected?
A3: Brake pipes should be inspected at every service interval. Additionally, if you notice any unusual noises when braking, a spongy brake pedal, or a warning light on your dashboard, have them checked immediately.
Q4: Is it legal to drive with corroded brake pipes?
A4: In most jurisdictions, driving with corroded or damaged brake pipes is illegal and considered a serious safety defect. A vehicle with such issues would likely fail an MOT or equivalent inspection and would be deemed unsafe to operate on public roads.
Q5: Can I use brake fluid to clean brake pipes?
A5: No, brake fluid is not a cleaning agent for brake pipes and should not be used in this manner. Brake fluid is a hydraulic fluid designed to transmit pressure. Its properties are not suited for cleaning or protecting metal surfaces in this context.
Conclusion
In summary, while the intention to protect brake pipes from corrosion is commendable, resorting to greasing or oiling them is a misguided approach that can lead to dangerous consequences. The integrity of your braking system is paramount. Always prioritise thorough inspection and, when necessary, professional replacement with high-quality parts. By adhering to these best practices, you ensure the safety of yourself, your passengers, and other road users. Remember, when in doubt, always consult a qualified mechanic to maintain your vehicle's critical braking components in optimal condition.
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