Generations
MC01 — First Generation MCC Smart Cabrio
1998–2007
0.7L 3-cylinder
Top issues to watch for
The most serious Smart (mcc) Cabriolet problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Dangerous
Flexible brake hose deterioration and failure (MC01)
The flexible brake hoses on Smart Cabrios deteriorate at an exceptionally high rate, failing MOT tests at 90 times the national average at some mileage bands. The hoses are subject to extreme flexing due to the car's short wheelbase and stiff suspension setup, causing internal braiding to fail and outer rubber to crack. This is compounded by the exposed mounting points that allow road salt and debris to accelerate corrosion. Hose failure can result in complete brake system pressure loss.
What happens if ignoredFlexible brake hose failure can result in sudden and complete loss of braking to one or more wheels. This creates an immediate collision risk and renders the vehicle unsafe to drive. Replacement requires renewal of all four flexible hoses plus brake system bleeding, typically costing £200-400.
Independent garage
£200–£350
Specialist
£250–£400
Main dealer
£300–£500
Parts only
£80–£140
Dangerous
Brake pipe corrosion (MC01)
Brake pipes on Smart Cabrios corrode at 6.6 times the national average due to their exposed routing and the car's low ground clearance. The pipes run along the vehicle's underside with minimal protection from road salt, water, and debris. The compact design means brake pipes are routed close to heat sources and moving suspension components, accelerating corrosion. Pipe failure results in brake fluid loss and potential brake system failure.
What happens if ignoredCorroded brake pipes can fail suddenly, causing complete loss of braking ability to affected wheels or total brake system failure. This creates an immediate collision risk. Brake pipe replacement requires system draining, pipe fabrication or replacement, and complete system bleeding, typically costing £300-600 depending on the extent of corrosion.
Independent garage
£300–£500
Specialist
£350–£600
Main dealer
£450–£750
Parts only
£50–£150
Major
Engine mounting bracket failure (MC01)
The engine mounting brackets on Smart Cabrios fail at 53 times the national average due to the combination of a rear-mounted engine, convertible body flex, and undersized mounting components. The 3-cylinder engine's inherent vibration, amplified by the lack of structural roof support in the convertible, causes accelerated fatigue in the rubber mounts and their metal brackets. Failure results in excessive engine movement that can damage surrounding components.
What happens if ignoredFailed engine mounts allow excessive engine movement that can damage exhaust components, electrical connections, and fuel lines. Severe cases can result in engine displacement that affects driveshaft alignment. Complete mount failure while driving creates a serious safety hazard with potential for engine components to contact the road surface.
Independent garage
£250–£400
Specialist
£300–£500
Main dealer
£400–£650
Parts only
£100–£200
Major
Brake binding issues (MC01)
Smart Cabrios show brake binding at 6.9 times the national average due to caliper piston corrosion and contaminated brake fluid. The exposed brake components and minimal ground clearance allow road salt and moisture to accelerate corrosion of the brake caliper pistons and guide pins. This causes brakes to partially engage even when the pedal is released, creating heat buildup and premature wear.
What happens if ignoredBinding brakes cause accelerated brake pad and disc wear, reduced fuel economy, and potential overheating of brake components. Severe binding can lead to brake fade during emergency stops. The issue typically requires caliper refurbishment or replacement plus brake fluid renewal, costing £200-500 per affected wheel.
Independent garage
£200–£400
Specialist
£250–£500
Main dealer
£350–£650
Parts only
£80–£200
1 more known issues tracked
Including wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.
Check a Smart (mcc) Cabriolet →MOT failure hotspots
Based on DVSA MOT test data. These are the items where the Smart (mcc) Cabriolet fails at a significantly higher rate than the average car.
Brake hoses perished or damaged
Brakes · 20-40k miles
MOT failure rate: 90x the fleet average
Sample: 436 tests
Light unit fault
Lights & Electrics · 20-40k miles
MOT failure rate: 67x the fleet average
Sample: 294 tests
Engine mounting/bracket severely damaged or det...
Bodywork · 40-60k miles
MOT failure rate: 53x the fleet average
Sample: 1,024 tests
Fuel system leaking, or missing or ineffective ...
Bodywork · 60-80k miles
MOT failure rate: 26x the fleet average
Sample: 722 tests
ABS fault
Suspension · 20-40k miles
MOT failure rate: 13x the fleet average
Sample: 363 tests
Suspension component damaged or corroded
Suspension · 20-40k miles
MOT failure rate: 10x the fleet average
Sample: 341 tests
Buying a Smart (mcc) Cabriolet?
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Related
Smart (mcc) Cabriolet reliability FAQs
What are the most common problems with the Smart (mcc) Cabriolet?
The Smart (mcc) Cabriolet has 5 known issues across 3 severity levels. The most serious are: Flexible brake hose deterioration and failure (MC01), Brake pipe corrosion (MC01).
Is the Smart (mcc) Cabriolet reliable?
The Smart (mcc) Cabriolet has 2 dangerous and 2 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.
How much does it cost to fix Smart (mcc) Cabriolet problems?
Repair costs range widely. The most significant issue (Flexible brake hose deterioration and failure (MC01)) costs £200–£350 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.