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Bosch

A boiling point, and two bullets

The boiling point nobody else on that shelf prints

Dry boiling point ≥ 230 °C.

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

It matters because brake fluid transmits force only while it stays liquid. When fluid at the caliper boils, gas forms, gas compresses, and the lever comes to the bar — under sustained braking on a descent, which is where it is least survivable.

The listing also publishes a two-year replacement interval, and states that the vehicle manufacturer’s requirement takes precedence. A seller publishing a schedule and then pointing past itself to your manual is behaving correctly.

And the charger, which does the opposite

Two bullets. One asks you to check compatibility yourself; the other gives a charging current, a voltage figure and the case dimensions.

No battery chemistry at all — no AGM, no gel, no lithium, each of which wants a different voltage profile. Three chargers on that shelf list what they handle. This listing lists none.

The whole of the Bosch range covered here, a page apiece

  • Bosch battery charger unit

    Bosch 0189921040

    A battery charger whose listing publishes an effective charging current of 5 A, a voltage figure of 14.7 V and dimensions of 169 × 81 × 54 mm, in two bullets.

    Charging current
    5 A effective (maker’s bullet)
    Voltage
    14.7 V, published by the maker as "input voltage" (maker’s bullet)
    Dimensions
    169 × 81 × 54 mm (maker’s bullet)
    Battery chemistries
    NOT published — no AGM, no gel, no lithium named.
    Charge programme
    The maker puts nothing in writing on this.
    Listing bullets
    Two. One is a compatibility warning; the other is the technical line above.
    Amazon reference
    B0CGJ8TLYZ (one reference across 5 Amazon marketplaces)
    EAN
    4047026640441
    • Publishes physical dimensions, which matters if the charger lives in a fixed place
    • 5 A is a sensible current for a motorcycle battery
    • Publishes no battery chemistry at all — AGM, gel and lithium all want different treatment

    Best for: A rider who already knows this model and is replacing one.

    ≈ €65
    Check price on Amazon
  • 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

Nothing written into the text below is a current price. Where an amount appears in a sentence, it is the reading taken on the day that sentence was written; what a shop is asking at this moment loads beside the product itself, and that is the figure to go by.