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Car advice - Hissing Brake pedal
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Old 27-09-2017, 19:06   #1
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Car advice - Hissing Brake pedal

Hey all,

Car is a 2006 Ford Focus 1.8Tdci

Today while out and about my brake pedal went hard. I was able to stop still. I carried on as it was on a roundabout and when I was off the roundabout the brake pedal seemed to go down again. However the brakes just don't feel right.

Checking all the vacuum pipes I could see nothing but came across this at the top of the brake pedal where it meets the firewall. Could this be causing the hissing and brakes not working as they should be?

It looks like a split grommet to me

Cheers

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Old 27-09-2017, 20:11   #2
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Re: Car advice - Hissing Brake pedal

Probably losing vacuum somewhere. A little talc blown into the area may show the leak jet.
Or very soapy water dripped onto it will bubble on a leak point.

On a previous car of mine it was a leaking diaphragm
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Old 27-09-2017, 20:23   #3
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Re: Car advice - Hissing Brake pedal

Was it a hard/expensive fix?
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Old 27-09-2017, 20:29   #4
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Re: Car advice - Hissing Brake pedal

Better safe than sorry, go to a garage.

Its not fun approaching a T junction and you press the brake pedal, only for it to go to the floor and you have to stand on the dam thing to get it to stop.

It was a change of underwear moment.
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Old 27-09-2017, 20:32   #5
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Re: Car advice - Hissing Brake pedal

It was a sealed unit, so they whole thing had to be swapped. Not too expensive luckily.

---------- Post added at 19:32 ---------- Previous post was at 19:31 ----------

http://www.fordownersclub.com/forums...problem-servo/
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Old 28-09-2017, 18:02   #6
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Re: Car advice - Hissing Brake pedal

The hissing sound implies an air leak, that together with loosing the servo assistance (Hard pedal). Servo uses a vacuum from the inlet manifold of the engine to help braking action.

Brakes are a serious matter and if you can't spot an obvious leak, sometimes splits in hoses only show up if they're bent, best to go to the garage.
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Old 28-09-2017, 19:27   #7
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Re: Car advice - Hissing Brake pedal

Have you checked for snakes
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