Description
Equip your medium-to-heavy commercial transport fleet with superior stopping power using the genuine Knorr-Bremse 19.5″ Air Disc Brake Caliper Assembly. Engineered specifically for 19.5-inch wheel end configurations on heavy delivery trucks and intercity coaches, this robust caliper assembly delivers high-capacity clamping force without thermal fade under demanding payloads. Worn guide sleeves, seized internal adjusters, and corroded housings compromise braking efficiency over time, resulting in longer stopping distances and expensive maintenance downtime. This heavy-duty replacement caliper assembly solves those challenges directly. It utilizes high-strength alloyed cast iron, precision internal guide mechanisms, and high-temperature seals to provide rapid pneumatic actuation, ensure uniform pad-to-rotor contact, and withstand severe highway and municipal abuse.
Technical Parameters
| Category | Specifications & Technical Details |
| Heavy-Duty Large-Diameter Twin-Piston Clamping System | We use a twin-piston drive layout optimized specifically for 19.5-inch disc diameters. It evenly converts pneumatic thrust into powerful disc friction force, meeting the short-distance hard braking demands of heavy-load vehicles. |
| High-Thermal-Capacity Anti-Fade Nodular Cast Iron Body | We cast the caliper body from thick-wall high-strength nodular cast iron. This greatly improves overall rigidity and thermal conductivity, effectively preventing high-temperature thermal deformation and braking performance fade caused by frequent braking. |
| Heavy-Duty Long-Travel Guide & Multi-Layer Sealing | We equip the caliper with a reinforced floating guide system and specialty high-temperature double-lip rubber dust boots. They maintain smooth axial sliding under the high-frequency torsion and vibration of multi-axle vehicles, completely blocking mud intrusion. |
| Integrated High-Precision Automatic Clearance Adjustment | We integrate a maintenance-free automatic wear adjustment nut. It steplessly compensates working clearance as brake pads naturally wear, keeping brake pedal travel highly consistent throughout the full service life. |
| All-Weather Extreme Thermal & Salt-Spray Composite Protection | We develop this caliper for extreme environments from -40°C cold to +900°C high temperature. The surface carries a multi-layer anti-corrosion coating, perfectly resisting de-icing salt, road moisture, and high-pressure washing corrosion. |
Applicable Car Brands & Models
Common warning symptoms include:
Vehicle Pulling to One Side During Braking: The heavy truck or bus pulls heavily left or right due to a seized or sluggish caliper piston.
Brake Drag or Overheated Wheel Hubs: The brake pad fails to retract after pedal release, resulting in continuous friction, smoke, and hot wheel rims.
Significantly Increased Stopping Distances: A noticeable loss in overall braking responsiveness and increased pedal effort.
Visible Air Leaks or Boot Damage: Hissing around the actuator interface or torn guide pin boots packed with road debris and rust.
While Knorr-Bremse offers official service repair kits (such as guide pin kits, boot sets, and tappet mechanisms) for routine maintenance, complete caliper assembly replacement is strongly recommended if the main cast iron housing is cracked, heavily corroded, or if internal guide bores are structurally scored.
Yes, absolutely. After installing a new caliper assembly, technicians must manually verify running clearance, test the pneumatic system for air leaks using soapy water, and conduct a road or brake-roller test to ensure proper braking balance across the axle.
Each caliper assembly is bolted securely to a custom-molded industrial wooden or heavy corrugated cardboard base, wrapped in anti-corrosion VCI barrier film, and fitted with heavy-duty port plugs to protect precision machined surfaces and threads during global wholesale transit.
