Chambers for Pneumatic Trailer Axles
A pneumatic (dry bulk) trailer runs the same 30/30 clamp-ring spring brake chambers as almost every other over-the-road trailer — the chamber is a DOT 121 foundation-brake part, not a trailer-type-specific one. What decides the part is the stroke (long or short) and the mounting, both of which match the number stamped on the can you're replacing.
Because a pneumatic (dry bulk) trailer often runs loaded and works its brakes hard, chambers are a routine replace-on-failure item — keeping a spare on the shelf keeps the trailer earning instead of parked at a repair bay.
Confirm the Stroke Before You Order
Long-stroke and short-stroke chambers aren't interchangeable, so we confirm fitment by the number on the old chamber or the trailer's build before it ships — a brake part is not the place to guess. The three variants (Long Stroke, Short Stroke, Double Diaphragm) cover the vast majority of pneumatic (dry bulk) trailer axles.
Fleet running multiple pneumatic (dry bulk) trailers? We stock 2-, 4- and 10-packs at a lower per-unit cost so you can restock the shop and skip the freight hit on singles.
Frequently asked questions
Do these chambers fit a pneumatic (dry bulk) trailer?
Yes — they're universal-fit 30/30 clamp-ring air brake chambers that fit standard pneumatic (dry bulk) trailer axles. Match the stroke (long vs short) to the number on your old chamber and we'll confirm it before shipping.
Do trailers use the same chambers as the truck?
In most cases yes — over-the-road trailer axles run the same 30/30 spring brake chambers as tractor drive axles. The stroke type and mounting decide the exact part, not whether it's on the truck or the trailer.
Are they DOT compliant?
Yes. DOT 121-compliant spring brake chambers for emergency and parking service, sold as direct aftermarket replacements with a 6+ month warranty and same-day shipping from Tacoma, WA.
Not sure which chamber you need?
Run your VIN and we’ll match the chamber to your exact truck or trailer, or call the counter — a person who knows air brakes confirms the stroke by the number on your old can before the order ships. No wrong-box returns.