righttime Posted May 27, 2019 Share Posted May 27, 2019 New to me, 2016 Edge. Hissing noise in driverside front seat area. Hiss stops when you press brake pedal. Checked brake fluid don't see any but reservoir is tucked back under firewall so there must be some in there cause brakes work. No idiot lights. Can I use regular dot 4 or does it have to be low viscosity? Quote Link to comment Share on other sites More sharing options...
bbf2530 Posted May 27, 2019 Share Posted May 27, 2019 Hi righttime. Can't help you with the cause of the hissing. Is your 2016 still within the 3 year/36,000 mile Bumper to Bumper Warranty or an extended warranty? If it is, call and make an appointment for a proper diagnosis and service. However, as far as what brake fluid specification to use: Use what your Owners Manual states to use. You can find that information in the Capacities & Specifications section. I always recommend people check their Owners Manual instead of relying on Internet strangers for this type of information. What happens if someone gives you the wrong specification information and you follow it? If you purchased used and do not have your Owners Manual, you can download the PDF version here: https://owner.ford.com/tools/account/how-tos/owner-manuals.html Let us know how you make out and good luck. Quote Link to comment Share on other sites More sharing options...
MY93SHO Posted May 27, 2019 Share Posted May 27, 2019 "Low viscosity"? Never heard of it. If the owners manual specifies Dot 4 that what you use. The only difference between Dot 3 and 4 is Dot 4 has a higher boiling point. Quote Link to comment Share on other sites More sharing options...
fordtech1 Posted May 27, 2019 Share Posted May 27, 2019 Hissing noise is most likely the vacuum booster is leaking. Take it to the shop. The only fix will be a new booster. 1 Quote Link to comment Share on other sites More sharing options...
YT90SC Posted May 28, 2019 Share Posted May 28, 2019 x2 to what Fordtech said. DOT 4 "LV" (Motorcraft p/n PM-20) is the only specified fluid. I wouldn't mix in anything else. Quote Link to comment Share on other sites More sharing options...
righttime Posted June 1, 2019 Author Share Posted June 1, 2019 Dealer replaced the BRAKE BOOSTER, F2GZ-2005-F, BUSHING 3M5Z-2L523-AA, AND GASKET CJ5Z-9439-A. Replacement Booster supposed to have 2yr warranty. No idea of parts or labor charge, this repair was under original warranty. Thank you Henry. Quote Link to comment Share on other sites More sharing options...
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