Timken HA590078 Wheel Bearing and Hub Assembly - Front

Timken Front Hub Assembly for Cadillac STS and SRX

Timken HA590078 is a front wheel bearing and hub assembly built for select Cadillac applications, including the 2008-2011 Cadillac STS with Brembo brakes and the 2004-2009 Cadillac SRX. It is engineered with OE-developed testing, precision bearing geometry, and low runout characteristics to support smooth wheel rotation, reduced noise, and stable braking performance.

Key Features

• Front wheel bearing and hub assembly for driven applications
• 30-spline design with 6 wheel studs
• 3 flange bolt holes for secure mounting
• Wheel pilot diameter: 70.10 mm (2.759 in.)
• Brake pilot diameter: 70.60 mm (2.779 in.)
• Hub pilot diameter: 91.42 mm (3.599 in.)
• Bolt circle diameter: 115.00 mm (4.527 in.)
• Flange diameter: 145.50 mm (5.728 in.)
• Flange offset: 42.06 mm (1.655 in.)
• ABS sensor is 100% tested for wheel-speed monitoring

Detailed Description

Timken HA590078 is a front hub assembly designed for direct replacement on the Cadillac STS and Cadillac SRX applications listed below. Timken uses OE-developed testing to control the design, materials, and manufacturing process, helping deliver consistent performance in demanding driveline and axle service. The bearing package uses precision profiles, uniform internal geometry, and enhanced surface finishes to support load capacity, bearing life, and efficient operation. Premium sealing features are used to help maintain sealing integrity and resist contamination, while the integrated ABS sensor is tested to monitor wheel speed for anti-lock braking systems. This part cross-references MOOG 513198 and SKF BR930363 for the same application. Fits 2008-2011 Cadillac STS, front, Brembo Brakes. Fits 2004-2009 Cadillac SRX, front.

Common Problems This Part Addresses

• Wheel bearing noise from the front hub area
• Vibration or runout felt through the steering or chassis
• ABS wheel-speed signal faults related to the hub assembly
• Uneven braking feel caused by hub-related runout
• Loose or worn front hub bearing performance on Cadillac STS and SRX models

Installation Notes and Tips

Confirm the vehicle’s front axle configuration, brake package, and hub dimensions before installation. Verify the 30-spline, 3-bolt flange, 6-stud, and 115 mm bolt circle specifications against the removed part, especially on 2008-2011 Cadillac STS models with Brembo brakes. Inspect the mating surfaces, axle splines, and ABS connector routing during replacement to ensure proper seating and sensor operation.

Quality Assurance

Timken manufactures this hub assembly using OE-developed test procedures and controlled production standards. The bearing and seal design is built around precision geometry, contamination resistance, and tested ABS functionality to support consistent front-end service on Cadillac STS and Cadillac SRX applications.