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DB4010 ‘MU’ (Mk 2) Series Disc Brake Caliper

DB4010 ‘MU’ (Mk 2) Series Disc Brake Caliper
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DB4010 ‘MU’ (Mk 2) Series Disc Brake Caliper - 1

Parts List General Description The ‘MU’ series of disc brake calipers is the smallest in the Twiflex range and is designed for light duty stopping and holding applications. The range consists of three spring applied, air released brake calipers type MUS2, MUS3 and MUS4; one handwheel adjustable spring applied, brake caliper type MUH; one air applied, spring released disc brake caliper type MU3 and one direct air applied brake caliper type MUP. This range of brakes is normally used with 8mm (0.31 in) thick discs having a minimum dia. of 150mm (5.91 in), (these are not available from the standard Twiflex range), but the MUS3 caliper will accommodate discs up to 11 mm (0.43 in) thick. With a revised thruster mounting arrangement (see page 3) the MUS3 and MU3 calipers can be used with standard Twiflex discs 12.7mm (0.50 in) thick. The MUS2 disc brake caliper, the smallest in the spring applied series, has a spring loaded piston type thruster The MUS3 disc brake caliper, the next in the series, is intended mainly for light holding duties (or for very occasional stopping applications). It has a diaphragm type thruster. No adjustment for brake pad wear is provided. The MUS4 caliper is similar to the US3 but has a heavier spring. This brake is used for normal stopping and holding duties. Both the MUS2 and MUS4 calipers have an adjusting screw in the push rod which allows the braking force to be maintained, provided regular adjustments are made to compensate for brake pad wear. The maximum air pressure to be used with these calipers is 7 bar (102 psi).

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DB4010 ‘MU’ (Mk 2) Series Disc Brake Caliper - 2

Disc Brake Caliper Assembly Type MUS2 Note: Set dimension ‘X’ to 175mm (6.89 in) with brake ‘ON’. This setting corresponds to maximum Braking Force setting. Readjust setscrew (item 17) when dimension ‘X’ exceeds 20mm (0.79 in). To avoid damage to thruster diaphragm do not turn the Piston Rod while adjusting the setscrew. Parts List Technical Data MUS2: Thruster only Part No. 7201112(S2). Caliper only Part No. 6780918. Complete assembly (Caliper and thruster) Part No. 6780922. Weight (complete assembly)- 1.360kg (3.00 lb) Minimum brake disc diameter- 150mm (5.91 in) Disc thickness (Standard)...

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DB4010 ‘MU’ (Mk 2) Series Disc Brake Caliper - 3

Parts List Technical Data MUS3: Thruster only Part No. 7201126(S3). Caliper only Part No. 6780918. Complete assembly (Caliper and thruster) Part No. 6780923. Weight (complete assembly)- 2.200kg (4.85 lb) Minimum brake disc diameter- 150mm (5.91 in) Disc thickness (Standard) - 8mm to 11mm (0.31 to 0.43 in) New pad dimensions- 30x50x21mm (1.18 x 1.97 x 0.83 in) thick No pad wear allowance is provided Total pad area - 30cm2 (4.65 in2) Minimum pressure for full retraction - 2 bar (29 psi). Maximum pressure- 7 bar (102 psi) *If one of the mounting spacers (Item 16) is repositioned between...

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DB4010 ‘MU’ (Mk 2) Series Disc Brake Caliper - 4

Stopping and Holding Duties Disc Brake Caliper Assembly Type MUS4 Notes: Set dimensions “X’ to 8mm (0.31 in) with brake ‘ON’. This setting corresponds to maximum Braking Force setting. Readjust set screw (item 26) when dimension ‘X’ exceeds 10mm (0.39 in). To avoid damage to thruster diaphragm do not turn the piston rod while adjusting the setscrew. Parts List Technical Data MUS4: Thruster only Part No. 7201127(S4). Caliper only Part No. 6780918. Complete assembly (Caliper and thruster) Part No. 6780924. Weight (complete assembly)- 2.240kg (4.94 lb) Minimum brake disc diameter- 150mm (5.91...

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DB4010 ‘MU’ (Mk 2) Series Disc Brake Caliper - 5

Handwheel Adjustable Disc Brake Caliper Assembly Type MUH Parts List Technical Data MUH: Hand Knob Assembly only Part No. 7800173. CaJiper only Part No. 6780918. Complete assembly (Caliper and hand knob assembly) Part No. 6780925. Weight (complete assembly) -1.150kg (2.54 lb) Minimum brake disc diameter- 150mm (5.91 in) Disc thickness (Standard) - 8mm (0.31 in) New pad dimensions - 30x50x21mm (1.18x1.97x0.83 in) thick Brake pad wear allowance - 2mm (0.08 in) each pad maximum Total pad area - 30cm2 (4.65 in2) Braking Force 560 N (125 lbf) at coefficientof friction m = 0.38 Brake torque (Nm)...

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DB4010 ‘MU’ (Mk 2) Series Disc Brake Caliper - 6

Disc Brake Caliper Assembly Type MU3 Parts List Maximum Pressure 5 bar = 73 psi 1 Nm = 0-738 Ibf-ft 1 bar = 15-5 psi' J_I_I_L Technical Data MU3: Thruster only Part No. 7201125. Caliper only Part No: 6780918. Complete brake assembly Part No. 6780921. Weight (complete assembly)- 1.900kg (4.19 lb) Minimum brake disc diameter- 150mm (5.91 in) Disc thickness (Standard) - 8mm (0.31 in) New pad dimensions- 30x50x21mm (1.18x1.97x0.83 in) thick Brake pad wear allowance - 5mm (0.20 in) each pad Total pad area - 30cm2 (4.65 in2) Maximum pressure - 5 bar (72 psi) Volume displacement of thruster at...

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DB4010 ‘MU’ (Mk 2) Series Disc Brake Caliper - 7

Disc Brake Caliper Assembly Type MUP Complete assembly (Caliper and thruster) Part No. 678919 Parts List Technical Data MUP: Complete assembly (Caliper and thruster) Part No. 6780919. Weight (complete assembly) - 0.800kg (1.76 lb) Minimum brake disc diameter -150mm (5.91 in) Disc thickness (Standard) - 8mm (0.31 in) New pad dimensions- 30x50x21mm (1.18x1.97x0.83in) thick Brake pad wear allowance - 5mm (0.20 in) each pad Total pad area - 30cm2 (4.65in2) Maximum pressure- 7 bar (102 psi) Volume displacement of thruster at maximum (6mm) (0.24 in) stroke- 3.8 ml (0.13 fl...

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DB4010 ‘MU’ (Mk 2) Series Disc Brake Caliper - 8

Continued from page 1 The MUH disc brake caliper is fitted with a large.plastic hand knob for adjustment of the spring thrust and provides an economic and effective brake for light holding duties or as a tensioning brake where hand setting can give an adequate braking control. The thrust force and consequently the braking force can be varied from zero to 560 N at maximum setting at coefficient of friction p = 0.38. The braking force of 560 N holds for pad wear up to 2mm (0.08 in) but declines to 360 N at 5mm (0.20 in) pad wear each pad. The MU3 is a pneumatically applied, spring released...

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