Why Your FOX FLOAT Shock Loses Air: Causes and Fixes
By FOX Canada | Published: 2026-11-03
Category: Tipps & Pflege
If your FOX FLOAT shock keeps losing air, work through the likely causes in order—from valve and pump issues to seal leaks—before assuming the worst.
Quick answer
Start by checking the Schrader valve and your pump for a slow leak, then inspect the air can seals. Most pressure loss comes from a loose valve core or worn seals, not a failed shock.
Why pressure drops overnight (and why it sometimes doesn't matter)
A small pressure drop after connecting a pump is normal—the pump and hose hold air that doesn't reach the shock. But if the shock loses air while sitting disconnected, you have a real leak. Temperature swings also change pressure: a cold morning can read 10–15 psi lower without any leak.
Before you rebuild anything, confirm the loss is real. Inflate to your target pressure, note it, wait an hour without connecting the pump, then check again. If it holds, the issue was likely pump loss or temperature, not a seal.
When a seal leak is the likely culprit
If pressure drops consistently and you see oil residue around the air can or hear a hiss when cycling the shock, the air can seals are suspect. This is common after many hours of riding or if the shock has sat unused. A seal kit and fresh fluid usually solve it, but you need the right tools and a torque wrench.
Don't overtighten the air can or valve—that can damage the seal or valve core. Follow FOX's torque specs and use only the recommended lubricant.
Diagnose your air loss step by step
- Symptom: pressure drops only after using the pump: Air lost when disconnecting the pump is normal. Recheck pressure without the pump attached after 30 minutes. If it holds, no repair is needed.
- Symptom: slow leak at the valve: Remove the valve cap, apply soapy water, and look for bubbles. Tighten the valve core with a core tool. If bubbles persist, replace the core. A valve core tool is cheap and worth keeping in your toolbox.
- Symptom: pressure drops overnight with no valve leak: Inspect the air can seals for oil residue or cracks. If found, plan a seal service. If you're not comfortable doing it, stop and have a shop service the shock. Seal service requires specific tools and torque values—don't guess.
- Symptom: pressure loss continues after seal service: The issue may be a damaged air can or internal piston seal. At this point, stop riding and contact a FOX service center or consider replacement. Repeated leaks after a proper rebuild point to a bigger problem.
Product facts
- FOX FLOAT PERFORMANCE: The FLOAT Performance is designed as a lightweight trail shock with a firm pedal platform and trail-hugging descent capability. If you're replacing a leaking shock, this model suits riders who want efficiency on climbs without sacrificing descending confidence.
FOX FLOAT PERFORMANCE
