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Ian Durrant

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  1. Thanks Theo, The non return valve rules out it being the pipe or connection to the manifold. Thanks for confirming there is no gasket. Pretty certain it's the MC dust gaiter which doubles as a seal and this one's just US.
  2. That was my initial thought too, but the depressions in the servo body would prevent a gasket sealing. Thanks for your input though but as above I think I have worked it out now 🙂
  3. Hi Steve, You are right the servo works, the problem is if the engine stalls you lose assistance immediately whereas when the servo doesn't leak you get 2 or 3 pumps of the pedal before you lose assistance completely. I think I have figured it out, the rubber dust cover is under the thin steel cap at the servo end of the MC. On Robsports website they classify that dust cover as the servo seal. I think the rubber rim that shows in the pic above between the end cap and the main cylinder body is meant to be the seal. It barely seals on mine (well the Wifes really) so I think I'll just get a rebuild kit and give the MC a service while it's apart.
  4. I used a hose on my ear and air is definitely entering the servo via the master cylinder flange, especially where those grooves are pressed in which I assume are meant to give brake flud a chance to get out if the cylinder seals start to leak.
  5. Hi all, My brake servo wasn't holding a vacuum, it works and passed the MOT but if you sit with your foot on the brake and switch the engine off, you can feel the pedal start to push back. I checked the non return valve with a Miti Vac and by blowing through it and it definitely works. So I thought it must have a hole in the diaphragm and duly purchased a servo. The problem is this one is exactly the same so I no longer think its a diaphragm issue. I am no expert on Servos, but it looks to me that the vacuum side is sealed by the master Cylinder, but when I removed the master the only thing that looks like it might be a seal is a black ring on the cylinder where it sits inside the recess. and unless there's a bit missing it doesn't look like it'll seal anything. Has a PO fitted the master and missed out a vital seal?
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