Description
AUTOMATIC SLACK ADJUSTER
Part Number: F40010143C
Direct replacement (cross ref) for 400-10143.
Product Overview
This automatic slack adjuster helps maintain proper brake adjustment as brake components wear over time. It replaces OEM part 400-10143 and is used in heavy-duty air brake systems.
A properly working slack adjuster keeps the brake stroke within spec and helps the truck stop evenly. When one starts failing, drivers may notice poor brake feel, uneven braking and excessive pushrod travel during inspections.
Brake adjustment problems are one of the fastest ways for a truck to end up out of service.
What the Part Does
The slack adjuster connects the brake chamber pushrod to the brake camshaft. As brake linings wear down, the adjuster automatically compensates to maintain proper brake clearance.
Without correct adjustment, brakes either drag too much or fail to apply with full force. The slack adjuster works directly with components like the brake chamber, clevis, and camshaft assembly.
Common Problems This Part Solves
A worn or failing slack adjuster can cause:
- Excessive pushrod stroke
- Uneven braking between wheels
- Brake dragging
- Poor stopping performance
- Out-of-adjustment brake violations
Corrosion, lack of lubrication, and internal wear are common causes of failure.
Why Replacement Matters
Brake adjustment affects both safety and brake life. If the brakes stay too loose, the stopping distance increases. If they stay too tight, heat buildup can destroy drums, shoes, and wheel seals.
Replacing a bad slack adjuster keeps brake operation balanced and prevents extra wear throughout the brake system.
Compatibility and Fitment
This automatic slack adjuster replaces OEM part number 400-10143. Always verify spline count, arm length, and brake configuration before ordering. Correct fitment is critical for proper brake geometry and stroke.
Installation and Service Notes
Installation involves setting proper brake adjustment and verifying pushrod travel after mounting the adjuster.
Lubrication points should be serviced regularly after installation. During replacement, inspect the clevis, brake chamber, bushings, and camshaft for wear. This component pairs directly with the Type 30 Spring Brake Chamber during many brake system repairs.
Use Case
Commonly used during brake overhauls, DOT inspection repairs, and fleet brake maintenance programs.
About Us
We’re a family-owned group of Peterbilt dealerships dedicated to getting you the parts you need quickly and affordably. Whether you’re looking for Paccar OEM parts, reliable aftermarket replacements, or popular upgrades like seats and filters, we make it easy to keep your truck running and on the road. If you don’t see what you need online, just give us a call or send an email — chances are we can get it. We pride ourselves on fast service, fair prices, and being a partner you can depend on when downtime isn’t an option.
