Quote:
Originally Posted by alex.s
only long term i would think as the pads wore down the fluid would go down and create a larger vacuum. but if you keep it topped off as the pad wears down it shouldn't be an issue i would think
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Every time you use the brake the fluid level will move down temporarily as you pressurized the brake system.
As the piston in the master cylinder moves to apply pressure to the brake system it will draw fluid in from the reservoir. When you release the brake pressure the fluid moves back.
From the link below -
"As with the rear plunger, it too sucks fluid from the reservoir until the first circuit rear seal passes the fluid intake and return port (again about 1.5mm), trapping fluid between it and the front of the master cylinder. This fluid is then forced out into the first brake circuit, applying those brakes.
When you take your foot off the brakes, the return springs push the plungers back into their neutral position. Fluid returns to the brake fluid reservoir and the system goes back to an unpressurised state."
Read more:
http://www.carbibles.com/brake_bible...#ixzz3Is6z8Rie