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Suspension Systems. Consumer Auto. What is a Suspension System?. It supports the weight of the car It keeps tires in firm contact with road It prevents body roll when cornering It keeps the wheels in alignment. Typical Suspension System Parts. Control arm Spring Shock Ball joint

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Suspension systems

Suspension Systems

Consumer Auto


What is a suspension system
What is a Suspension System?

  • It supports the weight of the car

  • It keeps tires in firm contact with road

  • It prevents body roll when cornering

  • It keeps the wheels in alignment


Typical suspension system parts
Typical Suspension System Parts

  • Control arm

  • Spring

  • Shock

  • Ball joint

  • Knuckle


Control arms
Control Arms

  • Can be an arm that in the shape of an “A” (purple)

  • Some are a heavy duty rod

  • Used to keep the tires in alignment


Springs
Springs

  • Front springs are usually coil springs (10)

  • Rear springs can be coil or leaf springs (11)

  • Some springs are a round bar called a torsion bar

  • Used to hold the weight of the car


Ball joint
Ball Joint

  • Mounted in the control arm, it lets the tire turn as well as go up and down at the same time

  • The other end mounts to the spindle


Steering knuckle blue green
Steering Knuckle (Blue Green)

  • Holds the tire to the car using a spindle

  • Attaches to the lower control arm and the strut or upper control arm

  • Connects to the tie rods for steering


Shock absorber
Shock Absorber

  • Stops the car from bouncing excessively

  • Helps prevent rapid tire wear

  • Does not support the weight of the car


Types of suspension systems
Types of Suspension Systems

Short Arm/Long Arm McPherson Strut


Short arm long arm suspension parts
Short Arm/Long Arm Suspension Parts

  • Upper & lower control arms

  • Upper & lower ball joint

  • Steering knuckle

  • Coil spring

  • Shock

  • Stabilizer bar & link


Short arm long arm suspension operation
Short Arm/Long Arm Suspension Operation

  • Control arms mounted to frame and the steering knuckle

  • Upper arm shorter than lower, making them unequal in length

  • Provides a way for the tires to maintain traction with the road when the car goes over bumps


Mcpherson strut suspension parts
McPherson Strut Suspension Parts

  • McPherson strut

  • Coil spring

  • Lower control arm

  • Knuckle

  • Stabilizer bar

  • Strut rod


Mcpherson strut operation
McPherson Strut Operation

  • Coil spring & shock are combined

  • The upper control arm is replaced by the McPherson strut

  • Less parts and weight which gives better gas mileage

  • Not a heavy duty suspension system

  • Used on smaller cars


Shock absorbers
Shock Absorbers

  • Used on SLA systems

  • Dampens the rebound of the spring

  • Stops spring oscillations

  • Provides resistance one way (extending)

  • Can wear out


Shock absorber inspection
Shock Absorber Inspection

  • Look at the shock for signs of damage

  • Look for leaking fluid from the ram end

  • Test the operation by jumping on the car to see if it bounces more than once

  • Replace the shock if it is bad

  • Replace in pairs


Air shocks
Air Shocks

  • Used to adjust height or help sagging springs

  • Used on rear

  • Air added and released manually


Automatic load leveling systems
Automatic Load Leveling Systems

  • Usually a four wheel system

  • Has an air pump and sensors that monitor the ride height

  • Air added & released automatically as needed


Active suspension systems
Active Suspension Systems

  • Springs & shocks replaced with actuators

  • Actuators work by hydraulics

  • They adjust the height of the car and the stiffness of the ride

  • Sensors automatically correct ride without input from the driver


Review
Review

  • Do shocks correct ride height?

  • What are the 2 types of springs?

  • Active suspension replaces springs and shocks with this part.

  • SLA stands for what?

  • What part does the McPherson strut suspension not have?


Review1
Review

  • What is the purpose of the ball joint?

  • Why do we need springs in the suspension?

  • In what type of car is McPherson strut suspension used?

  • What is one reason why we have suspension systems

  • The spindle attaches to what 2 parts?


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