Brakes, Tyres, Steering and Stability Systems
Understand air-brake pressure and warnings, retarders, tyres, steering, suspension, stability aids and centre-of-gravity effects.
How to prepare for the Northern Ireland LGV theory tests
Apply large-vehicle thinking to every rule: confirm entitlement and operating regime, inspect the complete combination, protect blind areas and stopping space, and keep professional CPC stages distinct.
Core concepts
Concept 1
Understand air-brake pressure and warnings, retarders, tyres, steering, suspension, stability aids and centre-of-gravity effects.
Exam cue: Confirm that the test stage and rule apply to DVA Northern Ireland LGV theory.
Concept 2
Build pressure and test systems before moving; reduce speed before bends and use fitted assistance within its limits.
Exam cue: Build pressure and test systems before moving; reduce speed before bends and use fitted assistance within its limits.
Concept 3
ABS, stability aids and retarders assist the driver but do not create grip or replace a sound service brake.
Exam cue: Check the whole combination and how the action affects exposed road users and later compliance.
Risk pitfalls and guardrails
Moving before safe air pressure or entering a bend with car-scale speed and steering expectations.
Guardrail: Do not apply car-scale or Great Britain administrative assumptions; account for LGV mass, dimensions, blind areas, load and the Northern Ireland regime.
Importing a Great Britain administration or road-law rule without checking Northern Ireland.
Guardrail: Use DVA and Northern Ireland rules for eligibility, licensing and territorial law even when a shared-skills publication comes from DVSA.
Treating the internal 601-item allocation as an official DVA topic weighting.
Guardrail: Do not apply car-scale or Great Britain administrative assumptions; account for LGV mass, dimensions, blind areas, load and the Northern Ireland regime.
Memory anchors
Pressure Before Progress
Do not move until the braking system reaches safe operating pressure.
Height Raises Risk
A high centre of gravity needs lower bend and manoeuvre speed.
Assistance Has Limits
Retarders and electronic aids do not replace observation or available grip.
Brakes, Tyres, Steering and Stability Systems: NI Source
Use the current DVA or Northern Ireland rule before applying shared technical guidance.
Brakes, Tyres, Steering and Stability Systems: Whole Vehicle
Account for vehicle, trailer, load, route, people, time and records before deciding.
Brakes, Tyres, Steering and Stability Systems: Preserve Margin
Choose the early safe legal action that preserves view, control, time and space.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Before moving an air-braked lorry, what should the driver confirm?
The low-air warning activates while driving. What is the safest response?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
What is Pass Harbor?
Completely free exam prep for 247 UK exams.
- Practice questions
- Flashcards
- Study guides
- Mock exams
- No registration
- No paywall
- Start instantly
“No more expensive exam prep. Quality study tools should be accessible to everyone.”