Join Date: Aug 2009
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The hissing sound is not continuous, only when you pump the brakes, once the brakes pump to the top of their travel it disappears. I got the wife to pump the brakes and I laid upside down in the footwell, the rush of air appeared to be coming from a rubber gaitor in the passenger footwell, it looks as if it must seal a pushrod that goes through the bulkhead to the servo, i.e when there is a lot of travel on the .brake pedal the pushrod overtravels and air is expelled from the inside of the gaitor but as the pedal stiffens up the pushrod travel is minimal and so less air is expelled from the gaitor.
Thanks for your speedy response, I will get the brother in-law to help me bleed the brakes, may even change the brake fluid.