FF4 SERIES SERVICE BRAKE

The Carlisle Brake & Friction FF4 Series Service Brakes are hydraulically actuated, four-piston disc brakes with retracting springs and automatic adjusters. They are typically bolted to the armature shaft of an electric wheel motor equipped with either a 20-inch or 25-inch diameter disc.

Additional Product Details

Piston housings constructed from ductile iron casting for superior brake durability
Equipped with Carlisle premium asbestos-free linings, providing superior stopping performance and life
Optional seal materials available for compatibility with all actuation fluids and temperatures
Modular piston design for easy serviceability
Piston insulators are standard to protect brake components from heat transfer

Technical Specifications

Caliper Material	High-strength steel and ductile iron
Disc Diameter Range	18.0 in to 25.0 in (457.2 mm to 635.0 mm)
Disc Thickness	1 in / 25.4 mm
Displacement per Brake	2.9 in³ (47.5 cm³)
Lining Area per Brake	110 in² / 709.68 cm²
Lining Material	Carlisle premium asbestos-free
Maximum Pressure	2000 psi / 137.9 bar
Mounting Attitude	Any position
Number of Pistons	4
Assembly Weight	122 lbs / 55.34 kg

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Company Name
Contact
Address 1
Address 2
Phone (Optional)
Email Address
Vehicle Type
Vehicle Model Number
Approximate Annual Volume
Normal Brake Usage	Service Park/ Secondary
Brake Location	Wheel Drive Shaft
Actuation	Mechanical Hydraulic SAHR
Actuation Fluid	Automotive Brake Fluid Mineral Oil Air
Gross Vehicle Weight (W gross)
Empty Vehicle Weight (W empty)
Gear Reduction (Gear red)	All gear reduction between the brake location and the vehicle ground contact.
Total Resistance (R%)	2% standard unless otherwise specified.
Maximum Brake Pressure (Pmax)	Maximum pressure available at brake input.
Number of Braked Wheels (n wheel)
Tire Rolling Radius in inches: Static (Rstatic)	Dynamic (Rdvn)
Brake Clearance in inches: Rim I.D.
Hub O.D.
Disc Dimensions in inches: O.D.
Thickness
Grade Hold Requirement (Gstatic.%)
Maximum Level Surface Speed (Vmax)
Stop Distance Requirement (Sstop)
System Actuating Time Delay (tdelay)	0% will be used unless otherwise specified.
Dynamic Grade Requirement (Gdvn.%)
Ground Coefficient (µground)	0.5 is typical ground coefficient for unmaintained loose earth.
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