Drum brakes
Suitable for every braking task
KNOTT develops drum brakes for vehicle construction and special applications, from the parking and service brake to the high-load application.
The right drum brake for your application
KNOTT offers five different designs of drum brake. Depending on the vehicle, the axle load and the braking task, mechanical or hydraulic solutions are used, from the classic service and parking brake to the powerful brake for high loads.
Cam brakes can be actuated mechanically as well as hydraulically or pneumatically through external cylinders and therefore allow the service and parking brakes to be combined.
Hydraulic simplex brakes are the most widely used design: the fixed support provides a backlash-free parking brake function and a constant characteristic value with good controllability.
Hydraulic servo brakes use a movable support bearing to transfer the friction force of the leading brake shoe to the trailing one, which achieves high braking torques with low actuating forces in a compact installation space.
Expanding wedge brakes score with fast response times and are suitable for ABS systems in commercial vehicle construction.
Expanding lever brakes are used on light trailers with linkage or a cable that can be retrofitted.
Design, brake assignment and engineering support
A drum brake is not just a drum brake. On the basis of our basic range we develop exactly the brake solution that suits the axle load, the installation space and the actuation concept of your vehicle. You receive support with the brake assignment, with the design of the required braking torque and with the integration into your axle and chassis concept, as a dependable basis for the start of series production and for homologation.
An extensive range of sizes
Drum diameters from Ø 115 mm to Ø 500 mm available.
Braking torques up to 40,000 Nm
From the light trailer to the heavy-duty application.
Customer-specific solutions
Individual adaptations from the KNOTT modular system.
The Knott drum brake designs at a glance
Each design covers its own requirement profile of braking torque, installation space and type of actuation.
Cam brakes
The sturdy cam brakes can be actuated mechanically or hydraulically or pneumatically through external cylinders. This allows the service brake and the parking brake to be combined in one brake.
Cam brakes are used above all as parking brakes, and in air-braked trailers also as a combined service and parking brake in the S-cam version.
Available sizes: Ø 115 mm - Ø 500 mm
Braking torques: up to 35,000 Nm
Hydraulic simplex brakes
Simplex brakes are characterised by a fixed support in the lower area. This makes a backlash-free parking brake function possible. A constant characteristic value provides good controllability.
The hydraulic simplex brake is the most widely used drum brake and is applied in almost every field.
Available sizes: Ø 160 mm - Ø 500 mm
Braking torques: up to 25,000 Nm
Hydraulic servo brakes
Servo brakes have a movable support bearing (usually on the underside) through which the friction force of the leading brake shoe is transferred to the trailing brake shoe. This makes it possible to achieve high braking torques with low actuating forces.
Servo brakes are suitable for large masses where the installation space is structurally limited, for example in forklift trucks.
Available sizes: Ø 170 mm - Ø 440 mm
Braking torques: up to 25,000 Nm
Expanding wedge brakes
Expanding wedge brakes are available in simplex and duplex versions. They are actuated through bolted-on air or hydraulic cylinders, and an additional parking brake function is possible through spring-applied cylinders.
Expanding wedge brakes are used mainly in commercial vehicle construction and, thanks to their fast response times, are well suited to ABS systems.
Available sizes: Ø 410 mm - Ø 500 mm
Braking torques: up to 40,000 Nm
Expanding lever brakes
Expanding lever brakes are actuated through linkage or through a cable that can be fitted from the outside afterwards, and they take on service and parking brake functions. With the optional integrated reversing mechanism, they are frequently used in light trailers.
Available sizes: Ø 160 mm - Ø 300 mm
Braking torques: up to 6,000 Nm
FREQUENTLY ASKED
QUESTIONS.
Which drum brake is suitable for particularly high braking torques?
With braking torques up to 40,000 Nm, the expanding wedge brake covers the high-load range and is suitable for commercial vehicle construction and for ABS systems.
Can a Knott drum brake be designed as a combined service and parking brake?
Yes. The cam brake can be actuated mechanically or through external cylinders and therefore combines the service and parking brake functions, for example as an S-cam version in air-braked trailers.
Which drum brake fits where the installation space is limited and the masses are high?
Thanks to its movable support bearing, the hydraulic servo brake achieves high braking torques with low actuating forces and is therefore suitable for compact applications such as forklift trucks.
How do I find the right drum brake if there is no part number?
The design can be narrowed down through the dimensions of the brake (diameter, shoe width) and the type of actuation. Our technical sales team will support you in making a clear identification.
INTERESTED IN A
KNOTT DRUM BRAKE?
Speak to our technical sales team directly. Tell us your first requirements in the contact form (for example the axle load, the installation space and the braking torque you want), and our engineering team will contact you about the design.
