4 Pk Type 12 Service Brake Chamber 1.75" Stroke for semi Truck Trailer Replaces 1200001 1412001 0214-100 274420 288795 5007117 KN36012 7409674

We bring this T12 Type Service Chamber with 1.75" Standard Stroke - Replaces OEM 12SC, 030013, 05-112, 0587-SC1200, 15-120, 62001, XX12SC, 1200001, KN-36120, KN36012, MA-36120, SC12, SC1200, 1412001, C12. This air brake service chamber is a critical component in heavy-duty truck and trailer braking systems. It converts compressed air pressure into mechanical push-rod force, enabling reliable brake application during normal driving operations. It delivers consistent braking power, long service life, and safe operation across demanding road conditions. Find more about this product below:

Dimension Details: This T12 Service Chamber is built to industry-standard Type 12 specifications. It has a precise sizing for reliable fitment. It has a chamber height of 3.125 inches, a 3-inch mount hole center-to-center spacing, and mounting bolts with a 0.4375" x 14 thread size. The push rod measures 0.5" x 20 in diameter and 8.75 inches in length, paired with a 1.75-inch standard stroke for proper brake travel. 

Round Inlet Type: A round inlet port ensures easy air line connection. It means that the air brake chamber has a circular port where compressed air enters. This air pushes the diaphragm, moving the push rod to apply the brakes. The round shape ensures a secure, leak-free connection with standard air hoses or fittings, maintaining proper brake performance. 

Function & Purpose: The T12 service chamber activates the service brakes by pushing its internal diaphragm and stroke mechanism outward when compressed air enters the chamber. This motion drives the push rod forward, engaging the foundation brake components.

With a standard 1.75" stroke, this chamber ensures proper brake travel, balanced braking force, and smooth pedal response. It plays a vital role in maintaining air brake system efficiency, helping the vehicle stop safely under load, during frequent braking cycles, and in varying operating environments.

Compatibility: Compatible with the following brands and part numbers:

• Fits Velvac: 030013
• Fits Batco 05-112
• Fits OE Aftermarket 0587-SC1200, 12SC, 15-120, 62001, XX12SC
• Fits Haldex 1200001, KN-36120, KN36012, MA-36120, SC12, SC1200
• Fits MGM Brakes 1412001, C12
• Fits Automann 179.SC12
• Fits Bendix 274420, 288795, 288796, 5007117, 5007117N, 800822, 800822BXW
• Fits Euclid E-12S
• Fits Freightliner HDX SC12
• Fits Leland Brake & Wheel Parts L1200SC
• Fits Proline HD PLBSC-12
• Fits Meritor R870012S
• Fits Parts Distribution T12
• Fits Perkins 7409674

Safety Points to Consider

• Always depressurize the air brake system before removing or installing the chamber.
• Inspect mounting hardware, push rod clevis, and brackets for wear or corrosion.
• Ensure the push rod length matches OEM specification to minimize brake imbalance.
• Verify clamp bands are properly seated and tightened to avoid diaphragm leakage.
• After installation, apply air pressure gradually and check for leaks or abnormal sounds.

Installation Instructions

• Release all air pressure from the brake system and secure the vehicle.
• Disconnect the air line and remove old mounting bolts.
• Check the mounting bracket surface and clean if needed.
• Position the new service chamber and align mounting holes.
• Install and tighten mounting bolts to recommended torque.
• Connect the air line to the round inlet port securely.
• Adjust the push rod length to match OEM brake specifications.
• Gradually pressurize the system and test for leaks.
• Perform a brake function test to ensure proper operation.

When to Replace the Service Chamber

• Air leaks, hissing, or diaphragm failure during brake application.
• Reduced braking power or uneven brake response.
• Corroded housing, seized push rod, or damaged clamp bands.
• Excessive stroke length or out-of-adjustment brakes.
• During brake system overhauls or when upgrading to new components.