Quote:
Originally Posted by laxman21
Brake fluid compresses about 1-2% at the most and it is greater at high temperatures, so in all reality you won't notice much at the pedal. Maybe 1/2" to 3/4 at high temperatures.
Don't those very large transportation vehicles use air brakes?
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the large transportation equipment will have , on different manufacturers , air brakes as well. however the hydraulic brakes are superior...very much so ! air brakes suffer from mositure . this then causes braking issues especially in cold weather..
also air does compress very well , compared to hydraulic brake fluid .
when you replace the worn brake componets the brake fluid in the lines and pistons is reduced. this then causes a much harder pedal..
air in the system will also do this ..when bleeding it is important to slowly press down on the brake pedal.. pumping quickly causes air bubbles to form...
with the pressure bleeder I used , we always filled the system with the pressure very low on filling...instead of filling the brake reservior we filled thru the brake calipers this pushed back all the air out the system ...