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Taf · 27-09-2017, 19:11

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

27-09-2017, 19:11	#2
Taf cf.mega poster Join Date: Jun 2003 Location: Kairdiff-by-the-sea Age: 68 Services: TVXL BBXL Superhub 2ac (wired) 1Tb Tivo Posts: 9,812	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