Quote:
Originally Posted by Seagull81
If you have a check valve in the line, how does it relieve the fluid back to the master cylinder to release the brakes? What am I missing?
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I consider check valves mandatory if the m/c is not at the highest point of the braking system. They keep most of the fluid in the calipers and cylinders for less pedal travel and much better brakes. They are not true check valves as you are thinking about them. Disk brakes use a 2 lb. and drums a 10 lb. These are the pressures that must be exceeded to allow fluid to return to the m/c, so as I said not a true check valve. Drums require a higher rating as the springs pull the shoes back where disks only have the pressure of the turning rotor.