Hitler Hadrump. Gassing Station » General Gassing. Search My Stuff What's New 3 12 24 If you boil your brake fluid should you change it?
Scoobman Original Poster posts months. Quick question I have lost my brakes a couple of times after the fluid has got too hot. Should you change it after this occurs. Does the fluid once cooled return to the same state it was before or does cooking it degrade its state? Was this on a track? In normal but hard road use this would suggest old fluid which will have absorbed some water. If on a track and the fluid is recent, you need a better spec fluid. SteveS Cup 1, posts months.
Are you sure you're boiling the fluid and not just experiencing brake fade? Shouldn't be able to boil suitable and fresh brake fluid. You have no brakes. Brake fluid's life span depends on what you drive, how you drive, and even where you drive. A Miata in cool and dry Iowa may last much longer. You certainly want to bleed the brakes every time fluid boils. Even if the reservoir looks clean, what's in the calipers could have broken down and trapped gas bubbles. Your car and your driving will also determine what to pour.
Standard DOT 3 or 4 fluid suffices for many. But bear in mind, if fluid's failing, other brake components may not be far behind—in extreme cases, the higher temperatures sustained by the performance fluid can actually finish them off. Stay away from DOT 5 fluids; they have high boiling points but don't mix well with other varieties.
You can't buy Brembos in a bottle, but good fluid that's properly maintained can be just the thing that saves your car or life, even. A brake-fluid flush should therefore be one of your rituals.
Suck the old fluid from the reservoir careful, it's corrosive. Top off with fresh stuff—not from an opened bottle that's been absorbing water on a garage shelf—as you bleed each caliper, starting with the one farthest from the master cylinder. This is because some of the heat generated during braking is transferred to the brake fluid.
This results in high temperatures which, in extreme cases, can cause the brake fluid to boil. However, when the brake fluid starts to boil, the brake pedal slackens and the braking power drops significantly. When brake fluid boils, vapour locks are produced that can be compressed. Brake pulses are no longer sent to the wheel brakes, the brake pedal goes all the way to the floor and that dreaded moment when nothing happens at all occurs.
The viscosity of the brake fluid is also very important. It is viscosity which safeguards the function of various brake systems.
The hydraulic units in these systems have numerous small bores and channels, some of which are smaller than the diameter of a human hair. Selecting a brake fluid with the wrong viscosity can have fatal consequences for the function of modern brake systems.
It is for this reason that the boiling point of a brake fluid is so important. We speak in terms of the dry boiling point and the wet boiling point. The dry boiling point describes the property of a new brake fluid that is still in its sealed container. On account of its composition, brake fluid has hygroscopic properties.
This means that it draws in moisture from its surroundings, primarily through the brake hoses. As a consequence, the water content of the brake fluid increases over time and the boiling point drops. The temperature known as the wet boiling point is reached at a water content level of 3. Once this point in time has been reached, the brake fluid must be changed. The actual boiling point of the brake fluid can be determined in a garage using a test device. This test should be carried out annually.
To safeguard the function of the brake system , the quality of the brake fluid must meet the specifications defined by the vehicle manufacturer. Furthermore, the prescribed intervals for changing the brake fluid must be observed. The classes in the standard are differentiated on the basis of dry and wet boiling point, as well as viscosity. Mixing DOT 3 fluids with other brake fluids is not recommended.
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