![]() 3, 4, 5, 5.1…ĭOT 5.1 has an even higher boiling point, but is considerably more expensive to buy and really only for competition cars. Both are compatible, so you can mix them together if you should so wish. The latter has a slightly higher boiling point and is said to absorb less water, so it is often seen as an upgrade for cars that were originally designed to use DOT 3. Which VW brake fluid?Īll brake fluids must comply with North American DOT specification and most cars use either DOT 3 or DOT 4 glycol ether-based types. Which is why brake fluid should be replaced every two years. Not only that but the moisture can corrode the brake system’s internals, causing pistons to seize and metal brake pipes to rust from the inside. ![]() And as soon as moisture’s been absorbed, the fluid becomes less efficient at its job. ![]() The problem is, despite its complexity, brake fluid is hygroscopic – in other words, it absorbs moisture that permeates through the rubber hoses, seals and via various fittings. Yet, like virtually ever other car component, it has a definite lifespan and shouldn’t be overlooked as an essential element of a routine maintenance schedule. VW Brake fluid has a fair bit of responsibility heaped upon it, doesn’t it? When we step on the anchors, we rely on it to do the necessary, work under pressure and bring things safely to a halt. So why then do we find it so easy to ignore? ![]() It’s virtually incompressible, has a high boiling point and yet costs buttons to buy. ![]()
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