Caliso BR55039 Solid Drum-in-Hat Rear Disc Brake Rotor

The Caliso BR55039 is a solid rear disc brake rotor with drum-in-hat (DIH) design, engineered as a direct OEM replacement for a variety of domestic front-wheel-drive passenger cars and light trucks. Built from high-strength cast iron and manufactured to strict metallurgical and dimensional standards, this rotor delivers dependable, consistent stopping power as a drop-in replacement for the original equipment part.

The rotor features a non-directional swirl finish on the braking surface, eliminating the need for machining or resurfacing before installation. The precision-machined hub hole chamfer provides a hub-centric fit, and extractor and set screw holes are included where applicable to simplify removal and installation.

Key Features:

• Solid rotor construction with integrated drum-in-hat parking brake surface
• Non-directional finish — ready to install without machining
• Cast iron construction for durability under repeated heavy braking
• Precision-machined mounting surfaces for accurate, vibration-free fitment
• Hub hole chamfer engineered for a proper hub-centric fit
• 5-lug bolt pattern

Specifications:

• Rotor Type: Solid
• Construction: Drum-in-Hat (DIH)
• Material: Cast Iron
• Outside Diameter: 278.2 mm (10.95 in)
• Overall Height: 51.1 mm (2.01 in)
• Nominal Thickness: 11 mm (0.43 in)
• Discard (Minimum) Thickness: 9 mm (0.35 in)
• Center Hole Diameter: 70.7 mm (2.78 in)
• Bolt Circle: 118 mm (4.65 in)
• Lug Hole Diameter: 16.1 mm (0.63 in)
• Lug Hole Quantity: 5
• ABS Tone Ring: Not included

Cross-Reference Part Numbers:

• Raybestos: 56629
• Wagner: BD125506
• Parts Master / Bendix: 125506 / PRT5155
• Aimco: 55039
• OEM (GM): 18060232