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DS1508 MSL Disc Brake Caliper - Spring Applied, Hydraulically Released

DS1508 MSL Disc Brake Caliper - Spring Applied, Hydraulically Released
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DS1508 MSL Disc Brake Caliper - Spring Applied, Hydraulically Released

Product catalog summary
Specifications:
The MSL Disc Brake Caliper is a spring-applied, hydraulically released system. It is designed for various disc diameters ranging from 250 mm to 610 mm. The caliper and thruster together weigh 5.5 kg, with the thruster alone weighing 4.0 kg. The maximum working pressure is 120 bar, and the volume displacement of the thruster at 4 mm retraction is 5 ml. The braking torque is calculated as the product of the braking force and the effective disc radius, with a nominal friction coefficient of 0.4.
Procedures:
For replacing hydraulic seals, the procedure involves removing the thruster, unscrewing the pushrod, and replacing the seals and O-rings. The thruster fitment requires ensuring the thruster rod is extended, adjusting the push rod, and securing it with lock nuts and a tension spring.
Standards and Recommendations:
Twiflex disc brakes must be used with Twiflex asbestos-free brake pads to maintain warranty validity. The document also notes that non-self-adjusting versions are available upon request.
Key Data from Graphs and Tables:
The document includes a graph showing braking torque versus oil pressure for different disc diameters. The retraction pressure is 5 bar, and the braking force varies with the rate, with full rate at 2.67 kN and minimum pressure for full retraction at 50 bar.
Available Spares:
Seal Kit (Part No. 7902806) and Self Adjusting Repair Kit (Part No. 7902805) are available. Thruster part numbers vary based on the rate: Full rate (7500124/AH40), 2/3 rate (7500125/AH41), and 1/3 rate (7500126/AH42).
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Catalog excerpts

DS1508 MSL Disc Brake Caliper - Spring Applied, Hydraulically Released-1

DS1508 MSL Disc Brake Caliper - Spring Applied, Hydraulically Released Nominal dimensions given For caliper dimensions see DS1500 Disc Thickness Weight (caliper and thruster) - 5.5kg (thruster only) - 4.0kg Volume displacement of thruster at 4mm retraction = 5ml. Maximum working pressure 120 bar 20 Rate Maximum Braking Minimum Pressure for Force - kN Full Retraction - bar Braking Torque Nm - Full Rate 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
DS1508 MSL Disc Brake Caliper - Spring Applied, Hydraulically Released-2

MSL Disc Brake Caliper - Spring Applied, Hydraulically Released 182 dia DRAIN HOLE Thruster Part Numbers MSL Caliper ArmsFull rate7500124/AH40 MSL 2/3rd rate7500125/AH41 MSL 1/3rd rate7500126/AH42 Non self adjusting versions are available - contact Twiflex for details. Depending upon the service conditions it may eventually become necessary to replace the hydraulic seals. This is done as follows: 6 mm (a) Remove thruster from caliper. (b) Unscrew and remove the pushrod. Thruste Locknuts Pushrod (c) Remove the end cap from the rear of the thruster. (see drawing above) (d) Unscrew M10 bolt. (see...

 Open the catalog to page 2

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