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DS2007 MRK Disc Brake Caliper - Spring Applied, Pneumatically Released

DS2007 MRK Disc Brake Caliper - Spring Applied, Pneumatically Released
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DS2007 MRK Disc Brake Caliper - Spring Applied, Pneumatically Released

Product catalog summary
Overview: The document provides technical specifications and procedures for the MRK Disc Brake Caliper, which is spring-applied and pneumatically released. It includes details on dimensions, weight, air volume, and pressure requirements.
Specifications:
  • Weight: Caliper and thruster - 10.0 kg; Thruster only - 3.5 kg.
  • Total air volume at full retraction: 0.95 liters.
  • Maximum working pressure: 7 bar.
  • Braking force and pressure requirements vary based on the rate (Full, 2/3, 1/3) with corresponding forces of 6.4 kN, 4.3 kN, and 2.2 kN, and minimum pressures for full retraction of 5 bar, 3.3 bar, and 1.7 bar respectively.
Braking Force and Torque: Braking force is defined as the tangential force on the brake disc at the effective disc radius. The braking torque is calculated as the product of braking force and effective disc radius (actual disc radius minus 0.03 m).
Material and Warranty: The brakes must use Twiflex asbestos-free brake pads to maintain warranty validity. Twiflex reserves the right to modify designs without notice.
Procedures:
  • Diaphragm Replacement: Disconnect air supply, remove the push rod, and replace the diaphragm following specified torque settings.
  • Thruster Fitment: Ensure the thruster rod is extended, adjust the push rod, fit lock nuts, and tighten to specified torque values.
Available Spares: Lists part numbers for diaphragm kits, self-adjusting repair kits, and spring kits, along with thruster part numbers for different rates.
Additional Information: The document includes diagrams and measurements for installation and maintenance purposes.
See more

Catalog excerpts

DS2007 MRK Disc Brake Caliper - Spring Applied, Pneumatically Released-1

DS2007 MRK Disc Brake Caliper - Spring Applied, Pneumatically Released Nominal dimensions given For caliper dimensions see DS2000 182 dia New pads 173 Worn pads 181 New pads 263.5 Worn pads 271.5 Weight (caliper and thruster) - 10.0kg (thruster only) - 3.5kg Total volume of air at full retraction is 0.95l Maximum working pressure 7 bar 3 Braking Torque - Nm ( Full Rate) Maximum Braking Force - kN Minimum Pressure for Full Retraction - bar The ratings shown on the above graph are based on fully bedded and conditioned brake pads with nominal friction coefficient μ = 0.4. For bedding-in and conditioning procedures see Publication M1060. 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 -0.03. Twiflex Disc Brakes must be used with Twiflex asbestos free brake pads. The use of any other brake pads will invalidate the warranty. Twiflex Limited reserves the right to modify or change the design without prior notice.

 Open the catalog to page 1
DS2007 MRK Disc Brake Caliper - Spring Applied, Pneumatically Released-2

MRK Disc Brake Caliper - Spring Applied, Pneumatically Released 123 Caliper Arms AVAILABLE SPARES Item Component Part No. 1 Diaphragm Kit 7902804 2 Self Adjusting Repair Kit 7902805 Spring Kit 7902800 Thruster Part Numbers Full Rate 7200654 2/3rd Rate 7200770 1/3rd 6mm 7200576 Rate Should it become necessary to replace a diaphragm, Remove from caliper and ensure air supply is disconnected. Unscrew and remove push rod. Remove the M5 bolts and the rear cap of the thruster. Remove the worn diaphragm; clean-up the contacting surfaces and re-assemble with the new diaphragm and M5 bolts in position...

 Open the catalog to page 2

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