Suspension
11 LessonsLearn struts, control arms, ball joints, and how to diagnose ride and handling complaints.
Overview
The suspension system keeps the tires on the road and the passengers comfortable. This module covers MacPherson struts, double wishbone, multi-link, control arms, ball joints, bushings, sway bars, and the alignment angles that determine how the vehicle drives straight and handles corners.
Key Components
- Struts and shock absorbers
- Control arms and ball joints
- Sway bar and end links
- Springs (coil, leaf, air)
- Wheel bearings and hubs
How It Works
The suspension connects the vehicle body to the wheels through a series of links, arms, and springs. Springs support the vehicle weight and absorb bumps. Shock absorbers (dampers) control spring oscillation. Ball joints and bushings allow controlled movement while maintaining alignment geometry.
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Join the Nation — FreeCommon Problems
- Worn struts causing bouncing and poor handling
- Ball joint wear causing clunking and alignment issues
- Sway bar end link rattle over bumps
- Wheel bearing noise increasing with speed
- Control arm bushing deterioration
Diagnostic Tips
- Bounce test: push corner down, should return to rest in one bounce
- Pry bar test for ball joint and bushing play
- Road test at speed — wheel bearing noise changes with turning
- Check ride height before doing alignment — springs sag
Related Systems
Braking
8 LessonsMaster hydraulic brakes — from rotor runout to master cylinder diagnosis.
ABS and Electronic Chassis
7 LessonsUnderstand ABS, traction control, stability control, and electronic brake distribution.
Steering
9 LessonsFrom rack and pinion to electric power steering — diagnose steering complaints with confidence.
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