Eskridge manufactures spring applied hydraulic release brakes. This type of brake is intended for safety and always engaged unless hydraulic pressure is applied to release the brake. Maximum braking torque is achieved when hydraulic release pressure is zero. These brakes are also known as a fail-safe brake. They are not intended for dynamic operation only static operation. These brakes can be offered as wet or dry. This guide is intended to help chose between a wet or dry brake for your planetary gearboxes.

Below, we’ll break down the key features of each brake system, so you can choose the best fit for your industrial needs.

Key Takeaways: Wet Brakes vs. Dry Brakes

Feature	Wet Brakes	Dry Brakes
Friction Material	Friction modified hydraulic oil or gear oil is used as the friction media.	Sintered bronze material used with no lubrication.
Friction Coefficient	Eskridge wet and dry brakes are designed to have the same friction coefficient and static torque rating when the Eskridge friction modified hydraulic oil is used.
Wear Resistance	Less wear over time.	More wear over time.
Use Case	Quieter operation if the brake slips.  Ideal for applications with high humidity or near the ocean to prevent condensation rusting the internal components of the brake.	Brakes will make more noise than the wet brake.  Does not require oil changes and reduces the chances of the brake leaking.
Heat Management	The fluid reduces heat buildup.	Bronze material has a higher heavy-duty.
Cost	Lower initial cost and less frequent repairs and replacements.	Higher upfront cost but may require more frequent maintenance or replacement.
Applications	Best for continuous operation.	Suitable for lighter operations with intermittent use, has a higher capacity in an emergency one time stop.

What’s the Difference Between Wet Brakes and Dry Brakes?

Wet and dry brakes may sound simple, but the differences in how they operate can impact everything from performance to repair costs. Let’s dive into the details of both systems.

Wet Brakes:

Wet brakes are sealed in a fluid-filled cavity. The fluid serves as both a coolant and the friction media, reducing wear and preventing heat buildup under most applications.

What makes wet brakes ideal:

• Longer lifespan: With constant lubrication, wet brakes don’t grind as much, which extends the life of your planetary gearboxes.
• Great for rugged environments: Whether you’re working in construction or mining, wet brakes handle use with ease.
• Less overheating: The fluid prevents brakes from overheating, even during long, continuous operations.

Dry Brakes:

Dry brakes, on the other hand, do not use fluid for lubrication. While they’re simpler and more affordable initially, they may wear out faster under heavy use.

Why you’d go for dry brakes:

• Easier maintenance: Fewer parts and no fluid make dry brakes easier to maintain.
• Best for lighter applications: Great for equipment that doesn’t operate under extreme loads or conditions. 

When to Use Wet Brakes vS. Dry Brakes in Planetary Gearboxes

Choosing the right brake depends on your operational demands. Here’s when to go for wet brakes or dry brakes for your planetary gearboxes:

Use Wet Brakes If:

• You need long-lasting brakes for heavy-duty industrial applications.
• Heat management is crucial due to continuous use or high-pressure environments.
• Maintenance costs are a concern, and you prefer longer service intervals.

Use Dry Brakes If:

• Your machinery operates in lighter applications, where heavy-duty braking isn’t needed.
• Simplicity is a priority over long-term wear resistance.

Impact on Gearbox Repair and Longevity

The brake type you choose directly impacts how often you’ll need gearbox repairs. Wet brakes reduce wear and extend the life of your gearboxes, making them ideal for industries that run their equipment continuously. Dry brakes, while easier to maintain upfront, may require more frequent repairs or replacements over time, especially in harsh environments.

FAQs About Wet Brakes vs. Dry Brakes in Planetary Gearboxes

1. Can I use dry brakes in heavy-duty applications?

While dry brakes can technically be used in heavier applications, they tend to wear out faster and may not handle the heat and pressure as efficiently as wet brakes. For heavy-duty operations, wet brakes are a better fit.

2. How often should I service my wet brakes?

Wet brakes typically require less frequent maintenance due to their lubrication, but monitoring fluid levels and checking for leaks is still essential.

3. What happens if my brake system loses hydraulic pressure?

In most planetary gearboxes, the brakes are spring-applied and hydraulic-release. If hydraulic pressure drops, the spring automatically engages the brake, preventing any unwanted movement and ensuring safety.

Conclusion

Whether you opt for wet or dry brakes, choosing the right system can improve performance, reduce downtime, and minimize the need for gearbox repairs. Need help deciding? Contact Eskridge Inc. for expert advice on the best brake system for your planetary gearboxes.