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Retroanaconda

Member Since: 04 Jan 2012
Location: Scotland
Posts: 2787

You are probably thinking of the pressure differential valve, which some earlier vehicles did have. This would detect a difference in front/rear circuit pressures and close off the one with the leak as well as activating a warning light.

Not sure how reliable they were. It was effectively done away with by the later master cylinders which operate in the way that blackwolf describes with a warning light sensor on the reservoir cap instea

25th Oct 2025 4:34pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 21029

Very true, and the brake reservoir cap sensor is very sensitive, it’ll kick in just a very small amount below max level on the level indicator.
Then of course the brake warning light comes on with that right away. ____\We|Will|Win/___
____/🇬🇧🇺🇸\____
_//*⛽️🛢️⚙️🧰*\\_

25th Oct 2025 5:37pm

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