Brakes hissing

[Welshy_Pete]

I've changed the discs, pads, calipers, hand brake cable managed to get everything working fine 306 hdi.

Now there a hissing sound coming from the brake pedal area. You can drive and it will start hissing but when you press the pedal a bit it goes then either comes back or goes random. The pedal goes a bit spungy I have noticed at the back of brake pedal very light fluid damp over the master cylinder seal.

So its all pointing towards a new brake master cylinder?

[bashbarnard]

Hissing will indicate the brake servo. Check the pipe leading to it for leaks. If not new servo time


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[Welshy_Pete]

Hissing will indicate the brake servo. Check the pipe leading to it for leaks. If not new servo time


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I just checked and found the pipe was not connected fully to the engine top right corner connection it has a clips in place but it wasn't over the clip and just looked on. I'm not sure how long thats been like that as I've not touched that. So I've put that back in the right place to see if that makes any difference.

[Welshy_Pete]

What problems does the one way Vacum valve solenoid cause?

Also how do you test this part?

[Poodle]

Suck/blow through it and see if the one way valve does its job.

[Welshy_Pete]

Suck/blow through it and see if the one way valve does its job.

Just making sure this is the vacuum pump?

Does this need to be taken of to test or just disconnected pipe?

https://www.ebay.co.uk/sch/Peugeot-306-C...660/i.html

[Poodle]

No, i'm talking about the one way valve, because that's what you just asked about...

To test the pump you only need to pop the pipe off. Just set the engine running and see if the pump is producing vacuum, ie put your finger over the end of the port and see if it sticks.

[TommiePuglet]

Welsh can i ask how long it took for you to do and some steps you took to do it as im having to do mine if i can find a break booster/servo