Troubleshooting
How to find and fix an air ride leak
Air suspension leaks almost always show up in one of two places - your air management system or your air suspension itself. Figuring out which side the leak is on narrows your search area down immediately. From there, soapy water and a methodical approach will find it almost every time.
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How to tell if you actually have a leak
Not every pressure drop is a leak. Compressors cycle, temperature affects pressure readings, and some controllers show slightly different numbers at different times of day. But if you're seeing consistent pressure loss or waking up to a car that's lower than you left it, something is leaking.
The simplest way to confirm a leak is to note your pressure at night and check it again the next morning before the car has been driven. If the number has dropped, you have a leak. If it's consistent, the drop you saw earlier was probably temperature-related or normal compressor cycling.
A sagging corner is a different situation, that's almost always a suspension-side leak rather than a management leak. A management leak tends to bleed pressure slowly and evenly across the system. A corner that's visibly lower than the others points directly to a leak at that specific bag, fitting, or line.
Management leak or suspension leak?
Before you start spraying soapy water everywhere, narrow it down to which side of the system the leak is on. This cuts your search area in half and saves a lot of time.
Sign of this
Management-side leak
Pressure drops slowly overnight but the car doesn't visibly sag at any corner. All four corners lose pressure gradually and roughly equally. The compressor runs more frequently than usual to maintain pressure. Your search area is the trunk - tank, compressor, manifold, fittings, and lines in that zone.
Sign of this
Suspension-side leak
One corner is visibly lower than the others when you come back to the car. That corner loses pressure faster than the rest. The leak is somewhere between the management manifold and the bag at that corner - the manifold port, the line run, or the bag fittings themselves.
How to find and fix a management leak
If you've determined the leak is on the management side, your search area is the trunk... or wherever your tank, compressor, and manifold are mounted. Air up the system to operating pressure and work through each component systematically with a spray bottle of soapy water.
Mix a generous amount of dish soap with water in a spray bottle, you want it sudsy enough that bubbles form easily. Spray each fitting, port, and line connection while the system is pressurized. Any leak will produce a steady stream of bubbles at the source. Small leaks produce small bubbles that form slowly. Give each area a few seconds after spraying before moving on.
Check first
All NPT threaded fittings
Tank ports, compressor outlet, manifold ports, pressure switch connections. These are the most common source of management-side leaks. If you find a leaking threaded fitting, deflate the system, back out the fitting, re-tape with PTFE thread tape, and reinstall.
Check second
All push-to-connect connections
Every point where an air line inserts into a fitting. If you find a leaking PTC connection, push the line in harder first - a partially seated line is the most common cause. If it's still leaking, check the line end for PTC bite marks, cut off the damaged section, and reinsert.
Check third
The lines themselves
Run your hand or the soapy water along the length of each line looking for damage. A line that was rubbing against something or got too close to a heat source may have a pinhole or crack in the jacket that's causing a slow leak.
Check fourth
Valves and solenoids
The valves inside your management manifold can develop leaks over time, especially if debris has gotten into the system. A valve that doesn't fully close will bleed pressure from one or more bags. Spray around the manifold body and valve ports while the system is pressurized.
How to find and fix a suspension leak
If one corner is sagging, you only need to check the components associated with that corner... not the whole system. Start at the manifold and work outward toward the bag, checking each connection point along the way.
Start here
The manifold port for that corner
Each corner of the car has a dedicated port on the manifold. Spray the fitting or push-to-connect connection at that port first. If this is leaking, the fix is straightforward. Re-tape a threaded fitting or reseat a PTC connection.
Then check
The air line run to that corner
Trace the line from the manifold to the bag and spray along its length. Look for any point where the line might have been rubbing, kinked, or damaged. A line that's been contacting a moving suspension component is a common cause of corner-specific leaks.
Then check
The fittings at the bag
Spray the port where the air line connects to the bag. This fitting takes vibration and movement every time the suspension cycles, it's a common leak point on older or heavily used setups. Check that the line is fully seated if it's a PTC fitting.
Last resort
The bag itself
If you've checked every fitting and line and still can't find the leak, spray the bag surface directly. A bag that's been rubbing on the chassis or has developed a small crack from age will bubble at the damaged point. Bag leaks typically require replacement rather than repair.
How to fix the most common leak types
Once you've found the leak, the fix depends on what's causing it. Here's how to address the most common ones.
Fix 01
Leaking threaded fitting
Deflate the system completely. Back out the fitting, clean the threads, wrap with 2–3 layers of PTFE thread tape clockwise on the male end, and reinstall hand tight plus one to two turns. Re-pressurize and recheck with soapy water before considering it resolved.
Fix 02
Leaking push-to-connect fitting
Deflate, depress the collet ring, and remove the line. Inspect the line end for PTC bite marks. If present, cut past the damaged section with an air line cutter. Reinsert the fresh line end firmly until it stops, then tug to confirm the grab ring has engaged.
Fix 03
Damaged air line
Cut out the damaged section of line. If the run is short enough, replace the whole line for a cleaner result. If you need a temporary fix in the middle of a longer run, use a union-style PTC fitting to splice in a new section. Then address why the line was damaged, re-route or secure it properly.
Fix 04
Leaking bag
Bag leaks generally require replacement. A bag that's rubbed through or cracked from age isn't a good candidate for patching, the failure point will continue to grow. Order a replacement bag for your specific vehicle and plan the install when you have time to do it properly.
Still can't track it down? Hit us up! We've been helping people diagnose air leaks since 2009 and there's almost nothing we haven't seen. Call 844-404-7344, email [email protected], or use the chat button on the site.