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Brake fluid

Bosch DOT 4, 500 ml

A 500 ml DOT 4 brake fluid published to three standards with a dry boiling point of at least 230 °C and a stated two-year replacement interval.

Bosch DOT 4 brake fluid 500 ml bottle

Bosch DOT 4, 500 ml

A 500 ml DOT 4 brake fluid published to three standards with a dry boiling point of at least 230 °C and a stated two-year replacement interval.

Dry boiling point
≥ 230 °C (maker’s bullet) — the only boiling point published in this family
Standards
FMVSS § 571.116 DOT 4, SAE J 1704, ISO 4925 Class 4 (maker’s bullet)
Replacement interval
Every 2 years, with the vehicle manufacturer’s own requirement taking precedence (maker’s bullet)
Volume
500 ml (from the title)
ABS
Inhibitor components stated to act as a protective lubricant against noise, wear and corrosion (maker’s bullet)
Stated compatibility
Suitable for vehicles manufactured before 2010 (maker’s bullet)
Amazon reference
B00P3XXJFC (one reference across 6 Amazon marketplaces)
EAN
4047025114592
  • Publishes a dry boiling point in degrees — the only fluid in this family to do so
  • Publishes a change interval AND defers to the vehicle manufacturer on it
  • The wet boiling point is not published, and that is the figure that degrades

Best for: One brake bleed on a machine specified for DOT 4, opened and finished the same day.

≈ £13 / €11
Check price on Amazon

Specifications

Dry boiling point
≥ 230 °C (maker’s bullet) — the only boiling point published in this family
Standards
FMVSS § 571.116 DOT 4, SAE J 1704, ISO 4925 Class 4 (maker’s bullet)
Replacement interval
Every 2 years, with the vehicle manufacturer’s own requirement taking precedence (maker’s bullet)
Volume
500 ml (from the title)
ABS
Inhibitor components stated to act as a protective lubricant against noise, wear and corrosion (maker’s bullet)
Stated compatibility
Suitable for vehicles manufactured before 2010 (maker’s bullet)
Amazon reference
B00P3XXJFC (one reference across 6 Amazon marketplaces)
EAN
4047025114592

The figure this whole family lacks

Dry boiling point ≥ 230 °C.

Four brake fluids sit on this shelf. One publishes a boiling point, and it is this one. Two describe theirs as extremely high, and one publishes nothing at all.

Why that number is the specification

Brake fluid transmits force because liquids do not compress. When fluid at the caliper boils, gas forms, the gas compresses, and the lever comes to the bar. It happens under sustained braking on a descent, which is where it matters most.

230 °C dry is the temperature of fresh fluid. The wet figure — after the fluid has absorbed the moisture it inevitably absorbs — is lower, and it is not published here. Between the two, the wet figure is the one your brakes actually live with.

The change interval, published and deferred

Every two years, with the maker stating plainly that the vehicle manufacturer’s requirement takes precedence.

A seller publishing a schedule and then pointing past itself to the manual is a seller behaving correctly. Brake fluid is not replaced because it looks dirty; it is replaced on time because it has been absorbing water the whole while.

Further down the same listing

FMVSS § 571.116 DOT 4, SAE J 1704, ISO 4925 Class 4. 500 ml. Inhibitor components stated to protect ABS components against noise, wear and corrosion. And a compatibility bullet naming vehicles built before 2010.

Why 500 ml is the right size for one machine

An opened container starts absorbing moisture. Five litres opened for one bleed is four and a half litres beginning to age on a shelf. Half a litre used in one sitting is the size that matches the job.

Availability

Between 11 € and 13 € across the German, French, Italian and Spanish Amazon stores, in the single reading behind this page.

Priced in local currency, which the euro range above deliberately leaves out, it also appears on the British Amazon store.

An entry with nobody selling against it sits in the American Amazon catalogue.

What Keepa returned in the single reading behind this page. Availability and prices move without notice.

Prices quoted in this text were read on 18 September 2026. The live price is at the top of the page.

More brake fluid

  • Liqui Moly DOT 4 brake fluid 500 ml bottle

    Liqui Moly DOT 4, 500 ml

    A 500 ml DOT 4 brake fluid published to three standards with a viscosity figure of 1800 mm²/s, stated miscible with high-quality synthetic brake fluids.

    Viscosity
    1800 mm²/s (from the title)
    Specifications
    FMVSS 116 DOT 3 / 116 DOT 4 | ISO 4925 Class 3 / Class 4 | SAE J 1703 / J 1704 (maker’s bullet)
    Volume
    500 ml (from the title)
    Miscibility
    Miscible and compatible with high-quality synthetic brake fluids (maker’s bullet)
    Low temperature
    Stated excellent low-temperature behaviour (maker’s bullet)
    Boiling points
    Stated extremely high wet and dry — no figure is given (maker’s bullet)
    Amazon reference
    B07L4T6LPF (one reference across 6 Amazon marketplaces)
    EAN
    4100420211560
    • Publishes a viscosity figure, which no other fluid in this family does
    • Three standards including the ISO class
    • Boiling points described rather than given, where one rival publishes ≥ 230 °C

    Best for: One brake bleed, on a machine that sees cold mornings.

    ≈ €7
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    Liqui Moly SL6 DOT 4, 5 L

    A five-litre DOT 4 brake fluid published against FMVSS 116, ISO 4925 Class 6 and SAE J 1703/J 1704, with car manufacturer recommendations listed.

    Specifications
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    Class
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    Volume
    5 litres (from the title)
    Stated recommendations
    Audi, BMW, GM Europe, Seat, Skoda and VW approvals — all car manufacturers (maker’s bullet)
    Boiling points
    Stated extremely high wet and dry boiling points — no figure is given (maker’s bullet)
    Miscibility
    Miscible and compatible with high-quality synthetic brake fluids (maker’s bullet)
    Amazon reference
    B07N94TH1L (one reference across 5 Amazon marketplaces)
    EAN
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    • States miscibility with other synthetic fluids explicitly
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    MANNOL 3002 DOT-4, 5 L

    A five-litre DOT-4 hydraulic fluid published to SAE J1703/J1704, ISO 4925 Class 3/4 and FMVSS 116 DOT 3/4, stated for conventional brake and clutch systems.

    Specifications
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    Stated use
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    Volume
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    Viscosity
    Stated excellent viscosity-temperature behaviour — no figure given (maker’s bullet)
    Protection
    Stated to prevent vapour lock and protect against corrosion and oxidation (maker’s bullet)
    Boiling points
    The maker puts nothing in writing on this.
    Amazon reference
    B00GHXBIJG (one reference across 4 Amazon marketplaces)
    EAN
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    • No boiling point published

    Best for: A machine with a hydraulic clutch as well as hydraulic brakes, both bled at once.

    ≈ €33
    Check price on Amazon

The rest of this rider’s shelf

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    Dimensions
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    Quantity
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    Material
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    Stated fitment
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    Maker’s instruction
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    Amazon reference
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    EAN
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    ≈ €10
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    Four brake pads of 45 × 35 mm with a 25 mm hole diameter for the Peugeot Speedfight 1 and 2, Jetforce C-Tech and Elyseo 50, and most electric machines.

    Dimensions
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    Quantity
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    Stated fitment
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    Position
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    Amazon reference
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    EAN
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    Stated fitment
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    EAN
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    Check price on Amazon

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