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Boiling point is not an issue for passenger cars as it takes a lot of repeated hard braking to get a caliper hot. Low speed repeated braking is the worst. At higher speeds, the air cooling is more effective. Going down mountain grades with your brakes on without engine braking at lower speeds is simply wrong. If you go down a mountain grade as higher speeds, aerodynamic losses are higher so there is less for the brakes to do. Example, on a long downgrade, if you had a terminal speed of 80 mph and went that fast, you might not need to apply the brakes at all. If you kept your speed at 50 mph, you might be doing a lot of braking and over heating the brake pads and perhaps calipers. Some downgrades with posted lower speeds are are really causing brake overheating. However, it would be good to initially enter the downgrade at a lower speed. If there are vehicles ahead going slow, you do not have any options.
With the reservoirs vented to atmosphere, the fluid picks up moisture there. Moisture never gets into the system at the calipers. If you change the fluid at the reservoir, you eliminate most of the moisture in the system. Do that before bleeding the brakes as you do not want to pump that contaminated fluid through the system. [Some vehicles have sealed reservoirs with a diaphragm providing isolation from the moisture in the air. This has been common practice, but is wrong. Lets take a fresh look. Lets create a critical safely system with a fluid that can pick up moisture from the air which then corrodes the master cylinder and the corrosion then makes the lip seals fail. And lets vent the reservoir to atmosphere guaranteeing contamination. And lets specify a boiling temperature for the fluid that is then compromised by the moisture contamination.]
I change the fluid at the reservoir often. If the reservoir shows dark or tinted fluid, that is overdue. Brake fluid is cheap, so its low cost maintenance.
posted by 108.207.11...
https://en.wikipedia.org/wiki/DOT_4
, Tue, 13 May 2014 15:54:32
, Mon, 12 May 2014 10:39:10
, Sat, 10 May 2014 12:52:08, Fri, 9 May 2014 18:07:51
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