Electric car maintenance: what it still needs, and what it skips

What is going on

An EV drivetrain has no pistons, valves, crankshaft, timing drive, clutch or multi-speed gearbox, which is the honest reason it needs less mechanical attention. It has more electronics instead, and it is heavier.

Regenerative braking does most of the slowing: lifting off turns the motor into a generator, and the friction brakes only join in for harder stops or at very low speed. So the pads last far longer. But a disc stays clean because the pad wipes it every time you brake, and without that wiping, surface rust turns into pitting and scale, especially where roads are salted, while calipers can seize from the same lack of use.

The weight of the pack and torque from a standstill work the other way and wear the tires faster. And most EVs have a separate cooling circuit that keeps the battery inside its temperature window, with a service interval that is easy to miss because the car otherwise asks for nothing.

What still needs looking after

• Brake discs and calipers: the pads last far longer, but the discs rust and the calipers can seize from lack of use, so they still need inspecting
• Brake fluid: unchanged, and still time-based, because regeneration does not slow moisture absorption
• Tires: often wear faster and less evenly, from the weight of the pack and instant torque
• The 12-volt battery: a normal wear item, replaced by age, and the most common reason an electric car will not start
• Coolant for the battery, the motor and the electronics: one or more loops with their own intervals, and not something you top up yourself
• Reduction-drive fluid: many manufacturers specify an inspection or replacement interval, and it is the item most owners have never heard of
• Bushings, ball joints and wheel bearings: the same parts as on any car, carrying more weight, so they get there sooner
• The cabin filter, washer fluid, wipers and lights: exactly as before
• The traction battery: no routine owner maintenance

What owners can do

1. Look at the brake disc faces, not just the pad thickness, at every tire change, regardless of mileage. Now and then, a few firm stops from moderate speed on a clear road scrub light surface rust off the discs, especially after a wet or salted spell.
2. Check tread depth more often than you are used to, keep the pressures right, and rotate the tires on the schedule in the owner's manual.
3. Check the brake fluid level against the markings, and have the fluid changed on its time-based interval even though the pads barely wear.
4. Have the 12-volt battery tested at each service, and keep a note of when it was last replaced.
5. Keep to the service schedule and keep the records, because the battery warranty holds as long as the schedule is followed and documented. Ask for a battery health test at every service: it takes a few minutes.
6. If any orange cabling or the charge port looks damaged, do not touch it and do not charge. Have it inspected.

Owner job, or workshop job?

• Tire pressures, tread depth, washer fluid, wipers and lights: owner checks, exactly as on any car.
• The brake disc faces and the brake fluid level: reasonable to check yourself. Look at the disc, not just the pads.
• Replacing pads and discs, or flushing the brake fluid: a professional job. Torque and air in the lines matter for safety.
• Battery and electronics coolant: not something you top up yourself. It has its own interval in the manual.
• The 12-volt battery: usually owner-serviceable, like any car battery. Jump-starting follows the manual's procedure exactly.
• The traction battery, the inverter and any orange cable: never an owner job. High-voltage work needs its own certification.

What people get wrong

That an electric car needs no servicing. It needs less. The tires, brakes, cabin filter, coolant, reduction-drive fluid and 12-volt battery all still apply. The classic miss is judging the brakes by pad thickness alone: on an EV the pads are the part that lasts, and the discs are the part that fails.

When to have it checked

An EV service is shorter than a conventional one, but it is not empty: a 12-volt battery test, brake fluid by age, discs and pads for rust and sticking calipers, the cabin filter, the battery coolant on its own interval, tires and alignment, a check of the high-voltage system and software updates, plus the reduction-gear oil on models that have it.

An independent workshop is fine if it follows the manufacturer's schedule, uses the right parts and is qualified for high-voltage work, so ask before you book. Rough braking with little pad wear points at rusted or scaled discs and is worth checking soon. Have the traction battery checked if warning lights appear or performance changes.

Read next

• The EV will not wake up: usually the small battery, not the big one
• Brakes squealing or grinding: what the noise means
• How to check brake fluid, and when it needs changing

This page is general information and does not replace a professional assessment. Symbols, codes and behaviour vary between makes. Always check the handbook for your own car.