The 'E' Type Forum

Thanks for your great suggestions Ralph, Christopher and JagWaugh :-) But I have to confess... I've been a right doughnut! Late last night I did remove the brake vacuum hose from the inlet manifold and tried it... I would swear blind it was making the hissing but it couldn't have been. I've just tri...

The vacuum hose that runs from the manifold to the reservoir will be back at atmospheric pressure once the engine is off. So long as the non return valve in the reservoir is working the reservoir and pipe from there to the Kelsey Hayes booster will still be under vacuum. I would suspect either a le...

abowie wrote:I'd be suspecting something related to the brake vacuum circuit, given that it persists for a short time after you turn the car off and everything else is therefore stationary.

Hi Andrew... I'd agree but I disconnected the vacuum hose from the inlet manifold and retried. Hiss was still there.

Hello all, Really hope you can help or point me in the right direction. My 68 S2 FHC has developed a hissing noise that I can't seem to track down (even used the hosepipe to ear trick). It seems to have happened after I did the following work - may / may not be coincidental: - Valve clearances check...