Free ASE A4 Cheat Sheet 2026: Exam Quick Reference

Steering Systems

30%of exam

Steering ColumnSteering GearPower SteeringEPSSteering Linkage

Suspension Systems

30%of exam

MacPherson StrutControl ArmsBall JointsSpringsShocks & StrutsStabilizer Bar

Wheel Alignment

28%of exam

CamberCasterToeSAIThrust AngleRide Height

Wheel & Tire Service

12%of exam

Tire WearTPMSRunoutBalanceLug Torque

Quick Facts

Exam: ASE A4
Credential: Suspension & Steering
Questions: 50 (40 scored)
Time: 60 min
Pass: Scaled score 70
Format: Multiple choice, Prometric
Validity: 5 years
Blueprint: 2026 ASE Study Guide

Idler Arm Check Memory Aid

Grasp arm, check vertical then horizontal play

Vertical: worn socketHorizontal: worn bushing

Hydraulic PS vs EPS

Hydraulic

Belt-driven pump
Fluid pressure assist

EPS

Torque sensor plus motor
Needs relearn or calibration

Fluid vs electric assist

Noise & Assist Complaint

Moan at full lock→Bleed trapped air(Cycle lock to lock)
Directional pressure loss→Suspect gear internal leak
Column-area clunk→Check U-joint and coupling
Intermittent EPS assist loss→Check torque sensor and ground
Excess nose-dive braking→Check shocks/struts(Not springs)

Steering Column & Linkage

U-joint & flex coupling: Column-to-gear connectors
Collapsible column: Crush zone absorbs impact
Idler arm: Check vertical and horizontal play
Pitman arm: Converts gear output motion
Tie rod ends: Check both movement planes
Center link: Connects pitman to linkage
Airbag column safety: Disconnect battery, wait 3 min

EPS Assist Loss Finder

Torque sensor or ground, the two usual suspects

Sensor: feeds assist calcGround: voltage integrity

Steering Gear Types

Rack-and-pinion: Input shaft seal common leak
Recirculating ball gear: Worm preload plus sector lash
Worm bearing preload: Set before sector lash
Sector lash: Pitman shaft overcenter preload
Directional pressure test: Low one way means gear
Off-center wheel after gear: Recenter wheel, even tie rods

Power Steering (Hydraulic)

PS pump: Hydraulic pressure source
Flow control valve: Bypasses excess at high RPM
Pressure relief valve: Caps max system pressure
PS fluid type: ATF or dedicated, per OEM
Moaning at full lock: Air trapped, bleed system
Flush methods: Manual cycle or exchange machine

Electronic Power Steering (EPS)

Torque sensor: Feeds assist calculation
EPS control module: Commands motor assist level
Poor ground fault: Causes intermittent assist loss
Variable assist steering: Max low speed, less highway
EPS relearn: After module or rack replace

Ball Joint Load Check

Jack under frame, not the control arm

Frame: unloads jointControl arm: hides wear

Load-Carrying vs Follower Joint

Load-Carrying

Bears vehicle weight
Spec: no play allowed

Follower

No vehicle weight
Spec: some play OK

Weight-bearing vs non-load

Front Suspension Components

Control arm bushings: Check unloaded with pry bar
Load-carrying ball joint: Bears vehicle weight
Follower ball joint: Non-load, still checked for wear
SLA ball joint check: Jack under frame, not arm
Excessive nose-dive: Points to weak shocks/struts

MacPherson Strut System

Strut mount/bearing: Replace with strut, wears out
Spring compressor: Safely transfers coil spring
Quick strut assembly: Pre-assembled spring plus strut
Strut rod: Locates arm fore and aft

Rear Suspension Components

Track bar: Controls lateral axle movement
Watts linkage: Alternative lateral axle control
Leaf spring center bolt: Locates spring on axle
U-bolts: Clamp axle, replace when worn
Shackles and bushings: Inspect alongside leaf springs

Springs, Shocks & Stabilizers

Coil spring sag: Vehicle leans, replace in pairs
Ride height check: Do before any alignment
Cupped tire wear: Worn shocks/struts, not alignment
Stabilizer bar bushings: Worn means excess body roll
Bushing torque position: Torque at normal ride height
FWD rear wheel bearing: Noise in coast and accel

Alignment Adjustment Order

Caster first, camber second, toe last

Caster: steering feelCamber: tire wearToe: final check

Camber vs Caster

Camber

Tilt in/out
Affects tire wear
Set 2nd in sequence

Caster

Fore-aft pivot tilt
Affects return & effort
Set 1st in sequence

Wear vs steering feel

Pull, Wander & Steering Complaint

Pulls one direction→Check cross-caster split(0.5 deg matters)
Wanders at speed→Check toe and tie rods
Hard steering→Check PS pressure and pump
Won't self-center→Check caster and binding(Memory steer)
Pulls under acceleration→Suspect torque steer(FWD halfshafts)
Toe changes over bumps→Suspect bump steer(Linkage geometry)

Primary Alignment Angles

Camber: Inward or outward tire tilt
Caster: Fore-aft pivot, affects return
Toe: Front-rear edge gap, set last
Thrust angle: Rear tracking versus centerline

SAI vs Included Angle

SAI

Fixed, not adjustable
Built into knuckle

Included Angle

Camber plus SAI
Finds bent knuckle

Fixed vs diagnostic sum

Angle Effects & Diagnosis

Positive camber wear: Wears outside tire edge
Toe-out wear: Feathered, inside edges raised
Cross-caster pull: Pulls toward less-positive side
SAI (KPI): Not adjustable, built into knuckle
Included angle: Camber plus SAI, finds bent knuckle
Toe-out on turns: Checks Ackermann, bent steering arm

Bump Steer vs Torque Steer

Bump Steer

Toe change in travel
Linkage geometry issue

Torque Steer

Pulls under acceleration
Unequal FWD halfshafts

Suspension vs driveline

Alignment Procedure & Sequence

Ride height first: Always check before aligning
Adjustment order: Caster, then camber, then toe
Memory steer: Binding linkage, not misalignment
Bump steer: Toe change through suspension travel
Torque steer: Pulls under power, FWD halfshafts

Tire Wear Cause Finder

Cupped=shocks, feathered=toe, edge=camber, center=air

Cupped: shocks/strutsFeathered: toeOne edge: camberCenter: overinflation

Static vs Dynamic Imbalance

Static

Single heavy spot
One weight, either lip

Dynamic

Heavy spots vary width
Split weights, both lips

Single vs split weights

Tire Wear Root Cause

Cupped/scalloped wear→Check shocks and struts
Feathered wear→Check toe setting
One-edge wear→Check camber angle
Center-only wear→Check for overinflation
Both-edge wear→Check for underinflation
Vibration, balance OK→Check runout with indicator

Tire Wear Patterns

Feathered wear: Toe misadjustment, raised inside edges
Cupped wear: Worn shocks or struts
One-side camber wear: Excess camber on that side
Center wear: Overinflation, tread bulges outward
Both-edge wear: Underinflation, load on shoulders

Direct vs Indirect TPMS

Direct

Sensor per wheel
Needs relearn after rotation

Indirect

Uses ABS wheel speed
No physical sensor

Sensor vs speed-inferred

TPMS & Tire Service

Direct TPMS: In-wheel sensor reads pressure
TPMS relearn: Required after rotation, direct systems
Slow leak sources: Valve stem, bead, or sidewall
Lug nut pattern: Star pattern prevents rotor warp

Runout & Balance

Radial runout: Out-of-round, causes ride vibration
Lateral runout: Side-to-side wobble, dial indicator
Static imbalance: Single weight, either rim lip
Dynamic imbalance: Split weights, both rim lips

Common Traps

Ball Joint Play ≠ Automatic Replace

Some designs have preload ≠ Replace only past spec

Cupped Wear ≠ Alignment Problem

Cupping is shocks/struts ≠ Feathering is toe

SAI ≠ Adjustable Angle

SAI is fixed knuckle geometry ≠ Included angle is diagnostic

Bump Steer ≠ Torque Steer

Bump steer is suspension geometry ≠ Torque steer is driveline

Static Toe ≠ Toe-Out-On-Turns

Static toe checks straight-line ≠ Turns check Ackermann geometry

Visual Check ≠ Ball Joint Spec

Visual misses internal wear ≠ Measure load per spec

Pump Noise ≠ Always Pump Fault

Directional pressure loss is gear ≠ Moan at lock is air

Last Minute

1.Steering and suspension: 30% each
2.Alignment 28%, wheels/tires 12%
3.Order: caster, camber, toe
4.Ride height first, always
5.Cupped wear means bad shocks
6.Feathered wear means toe issue
7.SAI is not adjustable
8.Jack under frame for SLA
9.TPMS relearn after tire rotation
10.Lug nuts torque in star pattern
11.Disconnect battery before airbag work

ASE A4

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ASE Test Preparation - A4 Suspension and Steering (Automobile Certification Series)

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