Brakes hissing noise advice please
Discussion
Hi All,
Out in the Griff today and it has started making a hissing noise when pressing the brake pedal.sounds like air escaping from something. Pedal also seems to need a bit more pressure applied. If I press the pedal with engine off it firms up as usual and servo kicks back in ok after starting but hissing returns.
Cheers.
Out in the Griff today and it has started making a hissing noise when pressing the brake pedal.sounds like air escaping from something. Pedal also seems to need a bit more pressure applied. If I press the pedal with engine off it firms up as usual and servo kicks back in ok after starting but hissing returns.
Cheers.
Edited by ToneyCaroney on Sunday 26th February 15:36
You want to hope there's an air leak in the vacuum pipe going to the servo. Unfortunately more likely you have punctured the diaphragm in the servo. These are getting hard to find and are quite expensive, even worst you need to be a contortionist to change it. Could also be the master cylinder on its way out. Are you loosing any brake fluid?
Thanks all,
So I had a nose around this morning and the I don't seem to be losing brake fluid - reservoir is still a few mm from the top. I've looked a the servo as best I can by crawling into the footwell. It looks to be in good condition (apart from a bit of yellow gunk that seems to have been brushed on). Feeling around it (as much as I can get too) it feels solid and surface is smooth, i.e no rust. No brake fluid leaks into footwell either.
Pic of (part) servo.
So I had a nose around this morning and the I don't seem to be losing brake fluid - reservoir is still a few mm from the top. I've looked a the servo as best I can by crawling into the footwell. It looks to be in good condition (apart from a bit of yellow gunk that seems to have been brushed on). Feeling around it (as much as I can get too) it feels solid and surface is smooth, i.e no rust. No brake fluid leaks into footwell either.
Pic of (part) servo.
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