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A 2020-model electric forklift experienced complete brake failure during a load transfer operation. The machine had 4,200 operating hours and was operating in a temperature-controlled warehouse. The failure was sudden and unexpected.

The Symptoms

The operator was moving a pallet of 2,000 lbs when the brakes suddenly failed. The forklift accelerated uncontrollably, striking a rack before coming to a stop. Fortunately, no one was injured, but the damage was significant.

The Diagnosis Process

We performed a thorough brake system inspection. Here's what we found:

• Brake fluid level: Empty (no fluid in the reservoir)
• Brake lines: One line completely severed
• Brake pads: Worn to 10% of original thickness
• Brake disc: Severe scoring from metal-to-metal contact
• Master cylinder: No visible damage

The brake fluid leak was the root cause. Without fluid, there was no pressure to engage the brakes. The line had been severed, likely by a sharp object or a collision.

The Root Cause

We traced the brake line failure to a puncture. The line had been damaged by a sharp edge-possibly from a pallet jack or another forklift. The damage wasn't visible from the outside, but the line had been weakened over time.

Once the line was punctured, brake fluid leaked out rapidly. With no fluid pressure, the brakes couldn't engage. The forklift accelerated uncontrollably.

The Repair

We made the following repairs:

1. Replaced the severed brake line with a new one.
2. Replaced the brake pads (front and rear).
3. Resurfaced the brake disc to remove scoring.
4. Flushed the brake system with new fluid.
5. Adjusted brake pedal free play to the manufacturer's specification.

After the repairs, we tested the brake system:

• Brake fluid level: Correct (halfway between min and max)
• Brake pedal resistance: Firm and responsive
• Braking distance: Within manufacturer's specification
• No leaks: Confirmed with a pressure test

The forklift was back to full capacity. No more brake issues.

Preventive Maintenance

To prevent this issue from happening again, we recommend:

1. Check brake fluid level at every 500-hour service interval.
2. Inspect brake lines for damage every 1,000 hours.
3. Replace brake pads when they reach 50% wear.
4. Replace brake discs when they show signs of scoring.
5. Train operators to avoid sharp objects and collisions.
6. Perform a monthly brake system inspection.
7. Check for leaks during every forklift inspection.

Key Takeaway

Brake failures are dangerous. Always check the brake fluid level first when you suspect a brake problem. A dry reservoir is an immediate red flag. Regular inspections and preventive maintenance will prevent brake failures and keep your forklift fleet safe.