Complete Caliper with Carrier (Without Pads)

What is a Complete Air Disc Brake Caliper with Carrier (Pads Not Included)?

A Complete Air Disc Brake Caliper with Carrier (Pads Not Included) is a spare part for the pneumatic disc brake systems of heavy commercial vehicles. It combines the caliper body, actuating mechanism and carrier in a single unit and is supplied without brake pads. In the system, it transfers compressed air from the brake chamber through the mechanism to the pads, pressing them against both sides of the disc and distributing braking force evenly to the axle. Brake pads, dust boots and caliper seals are the parts replaced most often in the field, but when the carrier mounting seats wear permanently or the caliper body is damaged, a one-piece replacement may be needed. In workshops and parts shops, this product is also known as a complete caliper assembly or carrier-mounted caliper.

How does a Complete Air Disc Brake Caliper with Carrier (Pads Not Included) work and what parts does it include?

The unit is made of several main parts that work together so that braking force is distributed evenly to both faces of the disc. The carrier fixes the caliper to the axle mounting surface and keeps the body aligned with the disc. When the pads are fitted, this structure also lets each pad move freely and parallel to the disc. For that reason, evaluating the carrier and body together is the most practical way to judge the overall condition of this Complete Air Disc Brake Caliper with Carrier (Pads Not Included).

Carrier: the main mounting body that fixes the caliper to the axle flange and disc edge and transfers braking force to the axle structure.
Caliper body: the main shell that straddles the disc from both sides and carries the braking force.
Actuating mechanism: the internal assembly that converts movement from the brake chamber into the pressing force that pushes the pads against the disc.
Caliper rubbers and covers: protective seals that keep dust, mud and moisture out of the mechanism bearings.
Guide pins: moving links that let the caliper body slide freely on the carrier and need regular lubrication.

Types of Complete Air Disc Brake Caliper with Carrier (Pads Not Included)

Left side unit: mounted on the left side of the axle, a mirror-symmetric design matched to disc direction; fitted in reverse, pad contact is disturbed.
Right side unit: used on the right side of the axle, a counterpart design that must not replace the left unit.
Front axle type: units with a carrier structure matched to steering movement and front axle geometry.
Rear axle type: units using separate carrier geometry based on the rear axle flange and brake size.

How to choose the right Complete Air Disc Brake Caliper with Carrier (Pads Not Included)?

Selection should be made using the removed old unit. Compare the caliper's carrier mounting surface, guide pin slot positions, location relative to the disc edge and air connection port with the new unit. The vehicle class, axle type and brake system details should also be confirmed from the service record. Even within the same model series, Mercedes-Benz, MAN, Scania, Volvo and DAF can use different layouts, so choosing by model name alone is a mistake.

Criterion	What to check	Why it matters
Side	Left or right mounting position and orientation relative to the disc	A unit fitted in reverse disturbs pad contact and pressure balance
Axle type	Front or rear axle and the structure of the axle flange	Carrier geometry varies by axle
Carrier surface	Mounting surface on the axle and pin slots	An incompatible carrier prevents the caliper from seating properly
Actuating mechanism	Position of the brake chamber connection and direction of the lever	Ensures movement from the brake chamber is transmitted correctly
Protective parts	Condition of rubbers and covers	Prevents dust and moisture from entering the mechanism
Pad compatibility	Whether the pad type to be used matches the carrier	Pads and body work together, and incompatibility shortens service life

Installation and maintenance points

Pre-installation check: inspect the new unit's carrier surface and connection points for burrs, dirt or damage.
Side check: separate left and right units and align the direction with the disc correctly.
Fasteners: tighten bolts in the sequence specified by the manufacturer and to the correct torque.
Air line: after installation, check air connections and listen for leaks.
Guide pins: make sure the pins slide freely, and apply the appropriate grease to prevent dry friction.
First test drive: make several low-speed brake applications and watch for pulling, noise and imbalance.

Common faults and solutions

Pulling to one side: likely cause is a pressure imbalance between the two sides from wear in the carrier seats; solution is cleaning the surfaces or replacing the unit.
Delayed braking: likely cause is seizing in the mechanism or an air leak in the air line; solution is checking the free movement of the mechanism and inspecting the air line.
Whistling noise during braking: likely cause is an air leak or worn rubber; solution is replacing the connections and rubbers.
Pressure drop: likely cause is leakage at the mechanism seals; solution is inspecting the unit and, if needed, complete replacement.

Frequently Asked Questions

Is the Complete Air Disc Brake Caliper with Carrier (Pads Not Included) supplied with brake pads?

No, the product is supplied without brake pads. Pads are bought separately and their compatibility with the carrier should be checked before fitting.

Can the old caliper be repaired with a repair kit, or should the complete unit be fitted?

If the body and carrier are sound, replacing the rubbers and protective parts is often sufficient. Permanent wear in the carrier seats, a cracked body or damaged connection points make a complete unit the safer choice.

Can left and right side units be used interchangeably?

No, the unit is designed mirror-symmetric to the disc direction, so swapping them disturbs pad contact. Before fitting, confirm which side it belongs to by comparing it with the removed part.

When one side is replaced, should the other side also be inspected?

Yes, the two calipers on the same axle work together, so the carrier, mechanism and rubber condition on the other side should also be checked. A worn opposite side can negatively affect the life of the new unit and the braking balance.

Will this unit with a carrier still be sufficient if the axle flange is damaged?

If the axle flange has no damage, the unit alone may be sufficient. If there are cracks in the flange, guide pin slots or connection points, the axle structure should be repaired first and then the unit fitted.