3/4 full is fine. If there are marks on the side of the reservoir, the fluid just needs to be above the "minimum" mark. The reservoir should not be filled. The level will go down as the front brake pads wear down. Later, when new pads are installed, the pistons will have to be pressed back into the brake calipers. Doing that will push the brake fluid behind the pistons back up into the reservoir. That's why there needs to be room for it, otherwise it will spill over and eat the paint off the body, (and make a mess on the floor). Since the fluid is okay, that suggests there is no external leak. The master cylinder could be leaking internally but you should notice the brake pedal goes closer to the floor than normal. You'll need to have the brake system inspected to see why the warning light is on. There could very possibly be nothing wrong with the anti-lock brake system. It's yellow warning light often turns on when the red light is on because a problem with the brake fluid level or pressures can keep the anti-lock functions from working properly.
Tuesday, March 8th, 2011 AT 4:24 AM