Brakes, Tyres, Steering and Stability Systems
Air-brake operation and warnings, retarders, tyres, steering, suspension, ABS, stability aids, height and mass effects and safe fault response.
How to prepare for DVSA LGV Part 1
Apply large-vehicle thinking to every rule: know the vehicle and load, scan farther ahead, protect blind areas and stopping space, and keep legal records and CPC obligations in the correct test stage.
Core concepts
Concept 1
Large-vehicle braking performance depends on system condition, pressure, load, speed, gradient, tyres and available grip.
Exam cue: Build pressure and complete specified brake checks before moving.
Concept 2
Air-pressure warnings and abnormal braking response demand prompt action in line with the vehicle system and safety risk.
Exam cue: Use retarders appropriately without assuming they replace service brakes or suit every surface.
Concept 3
High centre of gravity and weight transfer increase rollover risk during bends, sudden steering and uneven loading.
Exam cue: Reduce speed before bends and avoid abrupt steering or braking.
Risk pitfalls and guardrails
Moving before adequate air pressure is available.
Guardrail: Do not apply car-scale assumptions to an LGV; account for mass, dimensions, blind areas, load and the applicable compliance regime.
Relying on a retarder on a slippery surface without considering drive-wheel grip.
Guardrail: Do not apply car-scale assumptions to an LGV; account for mass, dimensions, blind areas, load and the applicable compliance regime.
Entering a bend at car-like speed because the road is dry.
Guardrail: Do not apply car-scale assumptions to an LGV; account for mass, dimensions, blind areas, load and the applicable compliance regime.
Memory anchors
Pressure Before Progress
Do not move until the braking system shows safe operating pressure.
Warning Means Safe Stop
Respond to brake warnings before control deteriorates.
Height Raises Risk
A higher centre of gravity needs lower bend and manoeuvre speed.
Retarder Assists
A retarder supports speed control but does not replace service brakes.
Tyres Carry the Load
Pressure, condition, tread and rating must suit the vehicle and load.
Smooth Protects Stability
Progressive steering and braking reduce weight-transfer and rollover risk.
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
Why must an air-braked HGV reach normal operating pressure before moving?
What should a persistent low-air warning lead the driver to do?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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