5-5.5" Bolt Circle 3,500 lbs. TruRyde® Trailer Axle Self-Adjusting Electric Brake Kit with Timken® Bearings - BK555ELEAUTO-TK

The TruRyde® 5-on-5.5" Self-Adjusting Electric Brake Kit with Timken® Bearings (Part #BK555ELEAUTO-TK) is a complete 3,500 lb axle brake and hub upgrade kit featuring premium Timken® bearings for smooth and reliable performance.

Key Features

• Part Number: BK555ELEAUTO-TK
• Brand: TruRyde®
• Capacity: 3,500 lbs per axle
• Bolt Pattern: 5 on 5.5" (5/5.5)
• Brake Type: 10" x 2.25" Self-Adjusting Electric Brakes
• Bearings: Timken® L68149 Inner / Timken® L44649 Outer
• Spindle: 84 Spindle
• Includes: Pair of 10" hub/drums (5 studs), Timken® bearings & races, grease seals, grease caps, ultra lube grease caps, spindle washers, spindle nuts, cotter pins, tang washers, lug nuts, and one pair of self-adjusting electric brake assemblies (LH & RH) with mounting hardware
• Brake Mounting: 4-Hole
• Compatibility: Fits Alko, Dexter, Lippert, Rockwell, Quality, and other popular 3,500 lb trailer axles with 4-hole brake flange
• Quality: Premium TruRyde® components with genuine Timken® bearings

This complete brake kit is ideal for upgrading or replacing brakes and hubs on 3,500 lb axles with a 5 on 5.5" bolt pattern. The self-adjusting feature provides consistent braking performance with minimal maintenance.

Questions about this TruRyde self-adjusting electric brake kit or compatibility with your axle? Call our trailer experts at 1-800-866-3336.

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QAI Certification Testing Standards for Trailer Brakes

QAI Laboratories is an independent, accredited third-party testing and certification organization. QAI certification provides assurance that trailer brakes have been rigorously tested to meet recognized safety and performance standards.

Primary Standards for Trailer Brakes

• CAN3-D313-M85 (R2012) — Canadian standard for Trailer Running Gear (axles, brakes, and suspension)
• CSA Z240 — Recreational Vehicles and Manufactured Housing standard
• FMVSS / CMVSS — Federal Motor Vehicle Safety Standards (U.S. and Canada) for braking performance
• UL Electrical Standards — Testing of brake magnets, wiring, and electrical components

What QAI Tests

• Braking performance and stopping power
• Electrical current draw and magnet strength
• Resistance to water, dust, heat, and corrosion
• Mechanical durability and long-term wear
• Self-adjusting mechanism performance (when applicable)
• Safety labeling and traceability

Trailer brakes that carry the QAI Certified mark (including many TruRyde® and Lippert® models) have been independently verified to meet these strict standards, giving you confidence in safety and reliability.

QAI Certified Trailer Brake Brands (Industry-Wide)

QAI Laboratories is a respected independent testing and certification organization. Below is the current status of major trailer brake brands regarding QAI certification:

Note: QAI certification is a strong indicator of independent safety and performance testing. Always verify current certification status on specific part numbers when safety is critical.