The short answer is a resounding no. Using brake fluid in your power steering system is extremely detrimental and can lead to catastrophic failure. While both fluids are liquids, their chemical compositions and functions are vastly different, making them completely incompatible. This article will detail why mixing these fluids is dangerous and what you should do instead.
Understanding the Differences: Brake Fluid vs. Power Steering Fluid
Brake fluid and power steering fluid serve entirely separate purposes and are formulated with different properties:
Brake Fluid:
- Composition: Primarily composed of glycol ethers, borates, and other additives designed to withstand high temperatures and pressures. It's hygroscopic, meaning it absorbs moisture from the air.
- Function: Transmits hydraulic pressure to your brake calipers, stopping your vehicle. It needs to maintain its properties under extreme heat and pressure generated during braking.
- Characteristics: High boiling point, excellent heat transfer properties, and aggressive on rubber seals.
Power Steering Fluid:
- Composition: Usually petroleum-based or synthetic fluids, often containing additives to reduce friction, prevent corrosion, and protect seals.
- Function: Lubricates and reduces friction within the power steering system, allowing for easier turning of the steering wheel.
- Characteristics: Good lubricity, compatibility with various seals and components within the power steering system, lower boiling point than brake fluid.
The Dangers of Mixing Brake Fluid and Power Steering Fluid
Mixing these two fluids can result in several severe problems:
- Seals Degradation: Brake fluid's aggressive nature will quickly attack and damage the rubber seals and hoses within your power steering system. This leads to leaks, loss of power steering assistance, and potentially complete steering failure.
- System Corrosion: Brake fluid's chemical composition can corrode various metal components in the power steering system, leading to premature wear and tear.
- Fluid Incompatibility: The fluids will not mix properly, leading to the formation of sludge and deposits that can clog the system's intricate passages. This will severely restrict the flow of fluid, leading to power steering failure.
- Expensive Repairs: The damage caused by using brake fluid in your power steering system will likely require extensive and costly repairs, including replacing seals, hoses, and potentially the entire power steering pump.
What to Do if You've Accidentally Mixed Fluids
If you suspect you've accidentally mixed brake fluid with power steering fluid, immediate action is crucial:
- Stop using the vehicle: Do not attempt to drive the vehicle until the system has been properly flushed and refilled.
- Consult a professional mechanic: A qualified mechanic can assess the damage, flush the power steering system, and replace any damaged components. This will prevent further damage and ensure the safe operation of your vehicle.
- Do not attempt a DIY repair: Flushing the power steering system requires specialized tools and knowledge. Improper flushing can exacerbate the problem.
Choosing the Right Power Steering Fluid
Always use the type of power steering fluid recommended by your vehicle's manufacturer. This information can typically be found in your owner's manual. Using the incorrect fluid can have consequences similar to using brake fluid.
In conclusion, never use brake fluid as a substitute for power steering fluid. The consequences can be extremely dangerous and costly. Always consult your owner's manual and a qualified mechanic for any power steering system issues.
