How do I know a part fits my truck?

Every listing shows the truck make, model years, side (left/right) and OEM cross-reference numbers. Match any of your OEM numbers to the listing, or send us your number and we will confirm fitment.

Do you ship the same day?

Orders placed before 12PM Central on business days ship the same day from our US warehouse. Transit is typically 2–5 business days depending on your state.

What is your return policy?

30-day returns on unused parts in original packaging. Wrong part shipped by us? We cover the return label and ship the correct one first.

Do you offer fleet or shop pricing?

Yes. Business accounts get tiered pricing, saved reorders and a dedicated line. Open a business account to see your pricing and order online.

Are these OEM or aftermarket parts?

We sell quality aftermarket parts cross-referenced to OEM numbers, plus select OEM-grade lines. Brand and grade are shown on every listing.

Can I order by part number?

Yes — type any part number or OEM cross reference into the search bar. If it is not listed, send it to us and we will source it.

Haldex-Type Automatic Slack Adjuster 5.5-6.5" Arm (40010121)

Automatic brake slack adjuster with hardware included. Ships from our Illinois warehouse.

Automatic Haldex Type Slack Adjuster, 1-1/2 in.-10 Spline, 5.5-6.5 in. Arm

Brand
- Automann
Quality Tier
- Premium Aftermarket
OEM Reference
- Haldex 40010121
Condition
- New
Warranty
- 1-Year FleetPro Warranty

Wholesale pricing for approved accounts

Open a FleetPro business account to see fleet pricing and order online. Repair shops, trucking companies & dealers welcome.

Request a business account

Terms and Conditions
30-day money-back guarantee
Shipping: 2-3 Business Days

Internal Reference: 135.1031

Same-day shipping before 12PM CT from our Illinois warehouse
Part requests and quotes answered within one business hour
30-day returns
1-Year FleetPro Warranty
Wholesale and fleet pricing for approved business accounts
We speak English, Russian, Ukrainian, Romanian, Bulgarian, French and Polish

Automatic Slack Adjuster, Specifications & Fitment

Automatic brake slack adjuster with hardware included.

Specifications

Automatic Haldex Type Slack Adjuster, 1-1/2 in.-10 Spline, 5.5-6.5 in. Arm
Brand: Automann
Grade: Fleet Premium

Where it's used

S-cam foundation brakes; keeps brake stroke in adjustment automatically. Replaces Eaton 818552, Eaton 973530, Euclid E6924B, Haldex 40010121, Haldex 40910649.

Specifications

Brand	Automann
Quality Tier	Premium Aftermarket
OEM Reference	Haldex 40010121
Condition	New
Warranty	1-Year FleetPro Warranty