Automatic Slack Adjuster, 6", Haldex Style - 1.5"-28 Spline 400-10212
This is a Haldex automatic slack adjuster featuring clearance-sensing technology with a 1.5-inch diameter 28-spline camshaft fitting, straight 6-inch arm with no offset, and plate and flat stud anchor bracket design, specifically engineered for trailer axle applications with 16.5-inch brake assemblies.
10 in stock
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Inspected partsMultiple checks before a part leaves Bristol.
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Ships from PennsylvaniaIn-stock orders leave the Bristol warehouse.
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Call the counterPart numbers, VIN lookups, and shop POs.
Need a number pulled?
Send the SKU, interchange, or VIN. The Bristol counter writes back.
Returns follow the policy on the order invoice.
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Free shipping on qualified orders $195.00+
| Construction | Unhanded automatic brake adjuster featuring drilled worm wheel design for smooth and reliable operation, with heavy-duty internal components manufactured from ductile nodular iron for added strength. |
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| Material | High-quality ductile nodular iron construction with factory lubrication and sealed housing ensuring low maintenance and long-lasting performance under demanding conditions. |
| Design | Clearance-sensing design with more sensitive adjustment rate to maintain optimal lining-to-drum clearance, featuring straight 6-inch arm with no offset and 1.5"-28 spline configuration. |
| Typical Application | Engineered specifically for trailer axle applications with 16.5-inch brake assemblies, compatible with long-stroke brake chambers in commercial truck and trailer braking systems. |
| Manufacturer | Part number | Notes |
|---|---|---|
| Freightliner | HDX 40010212, HDX 40020212 | OEM |
| Meritor | R806013, R806013A | Compatible |
| Euclid | E-6942 | Compatible |
| Haldex | 400-10212, 40010212, 400-20212, 40020212 | OEM |
| Automann | 133.2841, 135.2841 | Aftermarket |
| Mack | 539640010212 | OEM |
| Volvo Truck | 3946099 | OEM |
Verified Google Reviews
Customer reviews
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The counter pulled the interchange on a Haldex slack before I finished the VIN. Drum was on a pallet that afternoon.
Mike R.
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We stopped guessing on air springs. Same Hendrickson family as the WD shelf, priced so the truck goes back out.
Dana S.
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Called with a dirty casting number. They matched Truck-Lite and had two lamps ready to ship from Bristol.
Jose M.
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Owner-op here. Free ground over $195 is the only reason I do not drive to the pike for every filter run.
Chris T.
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Inspected parts, no mystery boxes. Our bay has used Fleet One for drums and chambers since 2019.
Pat K.
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Needed a 16.5 drum on a Friday. Bristol had the casting and it was on a truck before second shift.
Ron H.
