Manual Slack Adjuster for Trailer Brake Systems
Manual adjustment arm
Model Number:JZ250902
The slack adjuster connects the air brake chamber to the brake mechanism. By adjusting the arm manually, it maintains proper brake stroke and ensures consistent braking force.
Applications
• Semi trailers
• Truck braking systems
• Drum brake systems
• Heavy-duty transport vehicles
Why Choose Our Slack Adjusters?
Our manual slack adjusters are engineered for precision and durability. Designed to ensure accurate brake adjustment and reliable performance, they are ideal for heavy-duty trailer braking systems.
1.Durable Construction
Forged steel housing with hardened worm/sector gears ensures long-term reliability under frequent adjustments and heavy-duty use.
2.Stable Braking Performance
Manual fine-tuning maintains correct push-rod stroke, improving brake response, reducing lining wear, and extending drum life.
3.Serviceability & Compatibility
Greaseable design, replaceable bushings, and compatibility with American/European S-cam brake systems simplify maintenance and replacement.
4.Options & Specifications
Available in left/right hand, multiple arm lengths/offsets, and common spline sizes (e.g., 10-spline / 28-spline) to meet OEM and aftermarket needs.
What Is a Manual Slack Adjuster？
A manual slack adjuster is a key component in a trailer brake system. It is used to adjust the clearance between the brake shoes and the brake drum, ensuring effective braking performance.
| model number | trem No. | JZ-SD2937 | JZ-SD2910 | ||
| international number | OME No. | 2024 | 2023 | 18116 | 788213 |
| Spline Parameter (mm) | Spline No. | 37 | 37 | 37 | 10 |
| Width | 2.022 | 2.022 | 2.022 | 5.9 | |
| Big Diz | <40.9 | <40.9 | <40.9 | <38.2 | |
| Small Dia | <38.54 | <38.54 | <38.54 | <31 | |
| Body Parameter (mm) | A | 127 | 127 | 127 | 129 |
| B | 152.4 | 152.4 | 152.4 | 135 | |
| C | 177.8 | – | 177.8 | 150 | |
| D | 203.2 | 165 | |||
| E | 180 | ||||
| F | 195 | ||||
| bushings(mm) | Bush | <12.7 | <12.7 | <12.7 | <14 |
| note | Remark | American style | German style | ||
Key Features
• Precise brake clearance adjustment
• Reliable braking performance
• Durable and wear-resistant design
• Simple structure and easy maintenance
Manual vs Automatic Slack Adjuster
Feature Manual Slack Adjuster Automatic Slack Adjuster
Adjustment Manual Automatic
Maintenance Requires regular adjustment Low maintenance
Cost Lower Higher
Application Traditional systems Modern systems
Why Proper Adjustment Matters？
Maintaining correct brake clearance is essential for safe braking. Improper adjustment may lead to reduced braking performance, uneven wear, or safety risks.
Mechanical suspension
Air suspension
Landing gear
Whell rim
Bake air chamber
Brake Kit
Leaf spring
Container lock
American type axle
German type axle
HDB axle
Spoke type axle
Steering axle
Agricultural axle
Oil lubricated axle
