Research has suggested that more than a quarter of all the cars in the UK have defective brake fluid.
Now you, like us, might raise an eyebrow at that statement. The research, carried out for Cosan Lubricants’ Mobil Car Care range, however, bears some consideration.
Brake fluid is hygroscopic, meaning that it absorbs water from the atmosphere. Over time this reduces its effectiveness by lowering its boiling point.
When the fluid boils, vapour is produced – which is compressible – resulting in a soft brake pedal and a decreased, or non-existent, braking effort.
Cosan says that brake fluid, which has a typical boiling point of between 230-260 degrees C when new, becomes all but useless once it boils below 180deg.
Brake fluid expert Alba Diagnostic concurs, suggesting that brake fluid should be changed when its boiling point is down to 200deg C — and it’s below this figure that the research suggests more than a quarter of all cars will boil their fluid.