Separate normal regenerative transitions from friction-brake, tyre, hydraulic or control faults. A useful road test records battery state, drive mode, surface, temperatures, pedal behaviour, stopping stability and the diagnostic state before any codes are cleared.
Establish configuration and test conditions
Record VIN, generation, market, model year, tyre sizes, pressures, tread and battery state of charge. Photograph available drive and regeneration settings and confirm whether the candidate is the global BEV or earlier PHEV. Begin with a cold static inspection of fluid, hoses, calipers, discs, pads, parking-brake operation and visible wiring. Rust after storage may clean during use, but deep pitting, unequal contact or contamination requires measurement. Save module faults before clearing them because undervoltage, wheel-speed or brake-control events can explain an otherwise confusing road response.
Record generation and regeneration settings against the candidate VIN, test date and operating conditions. State what remains untested and who must close it before the vehicle advances.
Measure friction hardware instead of judging appearance
Measure disc thickness and runout where indicated, pad material, tyre tread and brake-fluid condition using suitable procedures. Compare left and right temperatures after a controlled drive to identify dragging or inactive brakes, while accounting for ambient conditions. Inspect caliper slides, boots, hoses and parking-brake mechanisms for corrosion or restricted movement. Low regenerative use can leave friction components underused, so a low odometer does not guarantee smooth discs or free calipers. Any replacement proposal should identify the cause rather than treating uneven wear as routine maintenance.
Record friction brake measurements against the candidate VIN, test date and operating conditions. State what remains untested and who must close it before the vehicle advances.
Test pedal blending and regeneration progressively
On a safe route with a qualified driver, begin at low speed and progress through repeatable moderate stops. Record pedal travel, initial bite, transition between regeneration and friction braking, steering stability, noise and warning messages. Repeat in the available regeneration settings and note battery state because a full, cold or limited battery may reduce energy recovery. Do not provoke emergency interventions on public roads. A change in deceleration between settings can be normal; a pull, pulsation, delayed hydraulic response or inconsistent pedal requires diagnosis with tyres, suspension and control data considered together.
Record controlled road-test sequence against the candidate VIN, test date and operating conditions. State what remains untested and who must close it before the vehicle advances.
Inspect stability, wheel-speed and post-test evidence
Scan braking, stability, powertrain and body modules and review wheel-speed consistency, calibration status and stored faults. Inspect for recent glass, suspension, steering, hub or collision work that could affect sensors or alignment. After the drive, recheck fluid level, odour, wheel temperature and warning state. If impact or water evidence is present, continue with the Q05 accident, flood and battery-repair guide. A clean dash after code clearing is not an approval result; retain the first scan and reproduce any fault.
Record diagnostic and sensor evidence against the candidate VIN, test date and operating conditions. State what remains untested and who must close it before the vehicle advances.
Write an acceptance and arrival-service plan
State which modes and speeds were tested, what environmental limits applied and which measurements passed. Separate confirmed repairs, preventive service and destination recheck in the landed-cost record. Confirm local access to compatible pads, discs, sensors, fluid specification and diagnostic equipment. Approve only when stopping stability, hydraulic response, friction condition and control-system evidence agree. If the candidate cannot be road-tested, assign an explicit post-arrival risk reserve or choose another vehicle rather than claiming normal operation from a workshop video.
Record acceptance and arrival plan against the candidate VIN, test date and operating conditions. State what remains untested and who must close it before the vehicle advances to commercial approval
Record the approval decision
Approve the braking system only when vehicle identity, friction measurements, tyre condition, controlled stopping behaviour and pre-clear diagnostics form one consistent record. Pause for unexplained pull, pulsation, overheating, hydraulic delay or stability faults. Any untested mode or destination service limitation must be priced and assigned before payment.
Retain the approval with the VIN file and reopen the review whenever the candidate, destination or commercial boundary changes.
Buyer approval checklist
Use these fields as a candidate-specific decision record. Assign each unresolved item before approving payment or shipment.
- BEV or PHEV identity
- Disc, pad and fluid measurements
- Tyre and alignment evidence
- Regeneration mode test
- Pre-clear diagnostic scan
- Arrival brake-service reserve
Primary references
Official Changan NEVO Q05 model page ↗Official NEVO Q05 specification sheet ↗Changan Q05 Brake and Regeneration Road Test: buyer questions
Does strong regeneration mean the friction brakes are healthy?
No. Friction components still require measurement and functional testing.
Why can regeneration weaken at high state of charge?
Battery and thermal limits can reduce accepted regenerative energy, so record conditions before judging the vehicle.
Can surface rust be ignored?
Light storage film may clear, but pitting, unequal contact, drag or vibration needs measurement and diagnosis.