HM Hydra-Mechanical Caliper – Part No: 120-8793
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HM1 Hydra-Mechanical
Prod #: 120-8793
Price: $110.68
Available Caliper #120-8793 Configurations
HM1 Hydra-Mechanical - Product Summary
Caliper No: 120-8793
HM1 Hydra-Mechanical

Piston Count 1
Piston Area (in²) 0.79
Piston Type Stainless
Dust Boot Yes
Rotor Dimensions
Rotor Width (in) 0.19
Rotor Diameter(in) 9.00
Pad Dimensions
Pad Area (in²) 1.7
Pad Volume (in³) 0.26
Duty Rating & Material
Material Cast Aluminium
Weight(Lbs) 2.7
Colors & Finish
Color Clear
Finish Clear Anodize

Mount Center(in) 3.00
Mount Position
Mount Side Right Hand
Mount Type Floating
UPC Number
UPC 889545006391
Product Documents
Product Data Sheet

Installation Instructions

WARNING: Cancer and Reproductive Harm
Applicable to Brake Pads Only

120-8793 - Product Description

HM1 Hydra-Mechanical

Wilwood's HM series Hydra-Mechanical calipers are the perfect rear caliper for utilty vehicles. HM calipers offer options of both left-hand and right-hand units, with piston sizing of either 1.00" or 1.19. HM calipers utilizes a cost effective die cast construction with advanced design and manufacturing techniques which results in a rigid, lightweight and durable caliper.

Vehicle Applications
Driving Environment Power Sports
Vehicle Sub-Types ATV, Snowmobile
Application Duty Medium Duty
Driving Environment Industrial
Vehicle Sub-Types
Application Duty Medium Duty

Product Specifications

Rotor Compatibility
Rotor Width (in) 0.19
Maximum Rotor Width (in) 0.19
Minimum Rotor Width (in) 0.15
Maximum Rotor Diameter(in) 9.00
Minimum Rotor Diameter(in) 6.50

Brake Pad Specifications
Brake Pad Type 1 6407
Brake Pad Type 2 N-A
Brake Pad Type 3 N-A
Total Pad Area (in²) 1.7
Total Pad Volume (in³) 0.26
Piston Specifications
Piston 1 Bore (in) 1.00
Piston 2 Bore (in)
Piston 3 Bore (in)
Total Piston Area (in²) 0.79

Mounting Specifications
Mount Type Floating
Mount Side Right Hand
Mount Center(in) 3.00
Mount Hole Size(in) 0.67
Mount Height(in)
Inlet Thread Size M10 x 1.00
Pad Dimensions & Part Numbers
Pad Dimensions for the HM1 Hydra-Mechanical Pad Dimensions for the HM1 Hydra-Mechanical Zoom Image
Axle Set P/N
Pad Type
Non-Bedded Pads - by Compounds
CM - Composite Metallic
CM - Composite Metallic
CM - Composite Metallic
Mount Dimensions & Part Numbers

Dimensions for the HM1 Hydra-Mechanical Dimensions for the HM1 Hydra-Mechanical Zoom Image

Additional Notes

Parts & Accessories

O-Ring Kit 130-10536
Replacement Dust Boot 210-6391
Replacement Piston 1 200-8238
Replacement Piston 2 N-A
Replacement Piston 3 N-A
Replacement Piston 4 N-A
Cross-Over O-Ring Kit N-A
Bridge Bolt Kit N-A
Wear Plate L/H N-A
Wear Plate R/H N-A
Pad Retainer N-A
Bleed Screw Kit 220-6069
Self Bleeder Tube N-A
Cross-Over Tube N-A
Products commonly used with this item:

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All images shown are for illustrative purposes only. Actual product received may be different than what is portrayed on the web site.
Wilwood makes every effort to maintain our web site to ensure the accuracy of prices and product information. However, product information and prices are subject to change without notice. Please call (805) 388-1188 before ordering to verify current prices and product information.
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Version: 3.05 June 23, 2023