You may still need to bleed air from the master cylinder brake switch. Pump up the brakes and holding pressure on the pedal, loosen the brake switch to let out air then tighten. The same way you would bleed brakes the old fashioned way. Getting air out of the lines and the switch are the same, just that sometimes you have to do the switch separately. A small amount of air in this switch will prevent it from operating correctly. Air is a gas and is compressible while just about any fluid is not. Meaning with a small amount of air in the switch, a lot more pressure will have to be applied to the brakes to get it to actuate than if it were solid with brake fluid. Remove the air and you now have a non-compressible fluid pushing on the diaphragm of the switch assembly which is almost directly related to the amount of brake line pressure developed when applying the brakes. Pressure is pressure no matter what is causing it but you won’t be developing the same amount of pressure in the switch with air in it for the same amount of brake pedal movement as you would with nothing but brake fluid in it.
|