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There was a post here suggesting to put some pressure on the brake pedal with a stick to prevent air getting into the brake system when replacing the switches.
Also put a drop of brake fluid (from your brake fluid reservoir float) into the hole at the top of the new switch; shake it and tap it until the fluid gets in / a bubble of air comes out. Repeat, and use a small pin to help the fluid in. Repeat once more, now the switch should be 'full' - keep vertical.
I did both of those when I recently replaced my switches and I had no issues.
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