sorry this is not an answer but, when you say youve got air in the brake fluid, do you mean that when you push the brakes, upon release you get a escaping air sound and that when you press the brake hard it feels less instant(spongy) as ive just experianced this noise not 10 minutes ago and cant find any info so far
regards
paul
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.