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DB2017 Disc Brake Caliper - Type T40 Hydraulically Applied

DB2017 Disc Brake Caliper - Type T40 Hydraulically Applied
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DB2017 Disc Brake Caliper - Type T40 Hydraulically Applied

Product catalog summary
General Description: The Twiflex T40 Disc Brake is a hydraulically applied caliper with a split design, consisting of two identical halves bolted to a central mounting plate. The mounting plate should match the brake disc thickness, starting from 20mm. The brake discs can be any diameter from 300mm upwards. Typically, one or two calipers are used per disc, ideally mounted on the horizontal center-line. The T40 caliper features hardened steel pistons and automatic pad retraction of approximately 1mm. It uses mineral oil-based hydraulic fluids and is not compatible with automotive brake fluids.
Specifications: The caliper uses M24 grade 8.8 bolts tightened to 680 Nm (500 lbf-ft). The total caliper weight is 19.6 kg, excluding the mounting bracket and bolts. The brake pads are asbestos-free, with dimensions of 85 x 85 x 19mm and a wear allowance of 10mm. The total pad friction area is 144 cm². The minimum disc diameter is 300mm, and the T40 can accommodate discs from 20mm thickness upwards.
Braking Performance: The braking force is 45kN at 100 bar oil pressure, with a braking torque calculated as the product of braking force and effective disc radius. The effective disc radius is the actual disc radius minus 0.045m. The maximum working pressure is 100 bar, based on a friction coefficient of 0.4.
Installation and Maintenance: Brake pads can be replaced without removing the caliper. The process involves unscrewing the pad retaining screws and removing the retaining plates. Reassembly requires clean mating surfaces and proper alignment of the pad backing plate. The T40 caliper is compatible with mineral oil-based hydraulic fluids like Shell Tellus 37 or Castrol Hyspin AWS32.
Optional Items and Spares: Optional items include bolt assembly kits, center mounting brackets, and steel tubing. Recommended spares include pad assemblies and seal kits. Twiflex Disc Brakes must be used with Twiflex Asbestos Free Brake Pads to maintain warranty validity.
Technical Data: The caliper is made from cast iron to BS1452 Gr. 17 and finished with hammer blue paint. The initial oil filling varies from 185ml to 300ml, depending on pad wear. The document emphasizes the importance of using Twiflex-approved components and fluids to ensure optimal performance and warranty compliance.
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Catalog excerpts

DB2017 Disc Brake Caliper - Type T40 Hydraulically Applied-1

DB2017 Disc Brake Caliper - Type T40 Hydraulically Applied Nominal dimensions given. For specific dimensions please contact Twiflex Limited. Centre Mounting Plate 105 Space Required For Pad Removal Minimum Disc Diameter 300mm for full Pad Coverage 71 M24 Bolts Grade 8-8 Tightening Torque 680Nm (500 lbf-ft) Brake Disc Braking Force. 45kN @ 100 bar oil pressure (normal maximum working pressure). Braking Force is defined as the Tangential Force acting on the brake disc at the Effective Disc Radius. Braking Torque (Nm) = Braking Force (N) x Effective Disc Radius (m) Where Effective Disc Radius = Actual Disc Radius - 0.045. 80 60 40 Maximum working pressure 100 bar These figures are based on a friction coefficient (µ) of 0.4. These are typical performance figures for fully bedded and conditioned brake pads. For bedding-in and conditioning see publication M1060. When used with standard Twiflex brake discs an appropriate service factor should be applied when designing the braking system, and in case of brakes used for holding duties or in wet conditions this should be not less than 2.0.

 Open the catalog to page 1
DB2017 Disc Brake Caliper - Type T40 Hydraulically Applied-2

Spares Technical Data Material - Cast Iron to BS1452 Gr. 17 Finish - Hammer blue Paint. Total caliper weight (2 caliper halves only) - 19.6 kg (excluding Mounting Bracket and Bolts). Weight of two bolts (M24 x 200) and two nuts (M24) - 1.92 kg. Weight of Centre Mounting Bracket - 6.6 kg. Pad dimensions (new) - 85 x 85 x 19mm. Pad wear allowance - 10mm. Total pad friction area - 144 cm2. Pad retraction - 1mm (each pad). Total oil displacement volumer per 1mm stroke - 15ml (for two caliper halves). Minimum disc diameter - 300mm. Disc Thickness - T40 can accommodate brake discs or wheels from 20mm...

 Open the catalog to page 2
DB2017 Disc Brake Caliper - Type T40 Hydraulically Applied-3

Disc Brake Caliper - Type T40 Hydraulically Applied Nominal dimensions given. For specific dimensions please contact Twiflex Limited. Mounting Plate Thickness to be the same as Disc Thickness Bleed Screw Bleed Screw Centre Mounting Bracket Stud Coupling Steel Piping made up to suit Stud Coupling 4 Holes for M20 Bolts (Gr. 8-8) Tightening Torque 392 Nm (289 lb-ft) Typical T40 Piping Layout with Twiflex Centre Mounting Bracket General Description The Twiflex T40 Disc Brake is a directly applied hydraulic caliper of split design consisting of identical halves which are bolted to each side of a central...

 Open the catalog to page 3
DB2017 Disc Brake Caliper - Type T40 Hydraulically Applied-4

Caliper Packages Caliper T40 (1) T40 Basic Caliper (6780880) comprising - two identical caliper halves fitted with friction pads and bleed screws. (2) Pipe Fitting Kit (Metric) (7300844) comprising - 2 Male Stud Couplings G18 (1/8” BSP) to 6mm O/D Tube and 1 Equal Tee Coupling to suit 6mm O/D Tube. (3) Pipe Fitting Kit (North American) (7300845) comprising - 2 Conversion Adaptors G1/8” male to 1/8” NPT female and 2 Sealing Washers. Optional Items 1 Bolt Assembly Kit (to suit 25.4 and 30mm brake discs) Part No. 6700879 comprising - 2 bolts M24 grade 8.8 x 200 long and 2 nuts M24 grade 8 2 Centre...

 Open the catalog to page 4

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