Cadillac CT4 2020-present Suspension Bolt Torque Specifications

Using the correct torque specification ensures the suspension components are properly secured. Under-torquing can lead to loosening, movement, and potential component failure, while over-torquing can stretch or break bolts, damage components, and alter suspension geometry. Incorrect torque can lead to dangerous handling issues and premature wear. For example, a loose lower control arm bolt could cause the wheel to wobble, while an overtightened knuckle bolt could shear, leading to immediate suspension failure.

Over-torquing a suspension bolt can stretch or weaken the bolt itself, potentially causing it to fail under load. Additionally, it can damage the threads in the receiving component, making it difficult to properly torque the bolt again. Over-torquing can also warp or deform the components, leading to improper alignment and accelerated wear. For instance, over tightening a strut bolt can crush the mounting flange.

It's generally recommended to replace certain suspension bolts, especially torque-to-yield (TTY) bolts, each time they are removed. TTY bolts are designed to stretch a specific amount when torqued, and reusing them can compromise their clamping force and structural integrity. These bolts will not hold torque reliably after being previously torqued. Some bolts, like those on the sway bar end links, can be reused if they are in good condition, but always refer to the vehicle's service manual. Reusing fasteners in critical locations can lead to component separation and loss of vehicle control.

You will need a calibrated torque wrench with an appropriate range for the specified torque values, sockets that fit the bolt heads, and potentially extensions or adapters to reach recessed bolts. Always use a torque wrench in good working order and check its calibration periodically. It's also helpful to use an angle gauge when torque-to-yield is required. Avoid using impact wrenches for final tightening of critical bolts as they can over-torque the fastener. For example, many suspension components require metric sockets like 15mm, 18mm, or 21mm.

Standard torque specifications involve tightening a bolt to a specific torque value. Torque-to-yield (TTY) specifications involve tightening the bolt to a specific torque value and then turning it an additional amount of degrees. TTY bolts are designed to stretch slightly, providing a very accurate and robust clamping force. Torque only bolts only use torque. Always follow the specified procedure for each bolt. Example: the lower control arm bolts may be TTY while the sway bar end links may only have a torque spec.