Why hybrid brakes can feel different, and when it is normal

What it means

When you lift off or brake gently, the electric motor is turned by the wheels rather than turning them. Run that way it becomes a generator, and some of the energy that would have been lost as heat in the brake discs is recovered as charge.

Brake hard, or come to a complete stop, and the ordinary brakes take over. The car manages the changeover, and it is usually invisible.

Why regeneration is sometimes limited

Regeneration is limited at times: a full battery, or a very cold one, has nowhere to put the charge, so the car quietly uses more friction braking. That is the pedal feel people notice on a cold morning.

Common causes

• A very cold battery, which can take little charge
• A full battery, which has nowhere to put the charge
• Hard braking or a complete stop, where the ordinary brakes take over
• Discs that are used gently and corrode, or calipers that seize from lack of use

What to do now

1. On a cold morning, expect the pedal to feel slightly different for the first few miles.
2. Mention any change in how the brakes feel at the next service.
3. Have the pads, discs and calipers inspected on schedule. They often last longer on a hybrid, but they can still corrode and seize.
4. Change the brake fluid by time, as the manual specifies. It absorbs moisture whether you use the brakes or not.

Normal, or worth reporting?

• A slightly different pedal on a cold morning or with a full battery: normal, because regeneration is limited and the ordinary brakes do more.
• A brake feel that has changed from how it used to be: mention it at the next service.
• A soft or spongy pedal: not a hybrid trait, so have the brakes checked now.
• Pads that seem to last and last: the discs and calipers still need inspecting for corrosion and seizing.

What people often get wrong

That brakes which last longer need no maintenance. Regeneration means the pads often last considerably longer, but the discs can corrode and the calipers can seize precisely because they are used less.

When the car must go to a workshop

Have the brakes checked if the brake feel has changed from how it used to be, if the pedal feels soft, or if slowing down when you lift off feels different. Anything near the orange high-voltage cabling is for a hybrid-qualified technician.

Read next

• Hybrid car maintenance: what differs from a petrol car
• Soft or spongy brake pedal: why it is urgent
• When to replace brake pads and rotors, and what to look for

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.