Welcome and greetings.
Jobs to do whilst cleaning under the (front) bonnet:
1 It's worth removing the wide black plastic by the bulkhead to clean under there. Also
2 check the flexing of the firewall by the brake servo/master cylinder (it's on the passenger side) whilst getting someone to push the brake pedal. If there's much movement there it could be worth adding a servo brace. They aren't expensive and will improve your brake feel.
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