My cap was loose on my master cylinder could i have air in my system now?
- Anonymous3 years agoBest Answer
Unlikely. Providing the fluid level is correct.
However brake fluid can absorb water from the atmosphere, and in excess, that can be somewhat dangerous if it gets to the brake cylinders and they get hot under heavy braking. The water can boil and turn to steam, driving the brake fluid out of the cylinders. The reservoir should never be left uncovered, most master cylinder tanks have a flexible rubber diaphragm that allows fluid to get lower as brake pads wear, but separates the fluid from open air to avoid it picking up moisture.
- Robert MLv 73 years ago
but just like OIL brake fluid SPOILS over time. If it is BROWNish get a full POWER BLEED. Many REAL car companies insist that you do this every 2-3 years. It is an ESTER compound that absorbs moisture from the AIR> in a HUMID climate itlasts even LESS time. The CAP OFF for a small period can cause MILD aceleration of the break down process. GOOD LUCK
- thebax2006Lv 73 years ago
Not unless all the brake fluid was gone form the reservoir.Source(s): Mitsubishi Master Tech
- 3 years ago
Not from that. Air only enters when there is a failure of the wheel cylinder or caliper seals.
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- don rLv 73 years ago
- ScottLv 63 years ago
Not necessarily, but if the cap was loose the brake fluid could have absorbed moisture or other contaminants. You should probably have the brake system flushed and bled.
- Anonymous3 years ago
You probably do have air in the system anyway. You have to bleed it out at each caliper to get all of it out. Most people would never notice if there was few tiny bubbles.
- 3 years ago
Not from a loose cover. The cover is there primarily to keep dirt out of the master cylinder's well. If the well is empty or there is a breach in the brake lines air can get in.
- STEVEN FLv 73 years ago
There is ALWAYS air above the brake fluid in the master cylinder. Unless you lost fluid, you should be OK.
- br549Lv 73 years ago
Only if all the fluid leaked out.