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06-09-2008, 03:58 AM
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#1
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Senior Member
Workhorse Chassis Owner
Join Date: Nov 2005
Location: chokoloskee, fl 34138
Posts: 717
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As I pulled the caps off my master cylindr I heard a slight psssst. Is this pressure or vacuum. I never had a master cylinder with any kind of + or - pressure. This was over a week after driving.
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2016 Dynamax DX3
USCG Ret BMCM
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06-09-2008, 03:58 AM
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#2
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Senior Member
Workhorse Chassis Owner
Join Date: Nov 2005
Location: chokoloskee, fl 34138
Posts: 717
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As I pulled the caps off my master cylindr I heard a slight psssst. Is this pressure or vacuum. I never had a master cylinder with any kind of + or - pressure. This was over a week after driving.
__________________
2016 Dynamax DX3
USCG Ret BMCM
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06-11-2008, 12:13 PM
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#3
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Senior Member
Join Date: May 2007
Posts: 100
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Administrators please forgive me!
Where are all the professionals? Ron 55 has a valid question and no one seems to want to help. Oh thats right, there is no potential sale.
Randy
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06-11-2008, 02:31 PM
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#4
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Community Moderator
Winnebago Owners Club Freightliner Owners Club
Join Date: Dec 2003
Location: Weyauwega, WI US
Posts: 8,720
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I have never heard anything similar when I have checked my brake fluid.
Don
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Don & Bev Morgan Weyauwega WI, 05 Itasca Horizon 40KD, 400 HP Cummins, Adopted by a great couple, Toad 07 Saturn Vue AWD, Air Force One, TST 510 TPMS, Mayor of Weyauwega 2007 - 2013, Waupaca Co Board Supervisor 2010 - 2014
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06-11-2008, 03:15 PM
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#5
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Senior Member
National RV Owners Club Workhorse Chassis Owner
Join Date: Oct 2004
Location: Scottsdale, AZ
Posts: 1,502
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There has been a mention of master cylinder hissing sound with cap removal and several comments in a previous thread on this forum.
Do a search in FIND with words like: master cylinder pressure and cap
__________________
2003 34' Dolphin 5342, W22, UP, UPGBrake, F and R Track Bars, Rear IPD sway bar, Koni FSDs, Safe-T-Plus, Scan Gauge II.. 2004 Jeep Liberty, Blue-Ox Adventa..
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06-12-2008, 12:17 PM
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#6
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Senior Member
Workhorse Chassis Owner
Join Date: Oct 2007
Location: South Jersey
Posts: 1,083
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I have had a small pressure release from one master cylinder cap while removing. The reason for removal was I thought I had a brake dragging while on a trip and I was checking everything for a cause.
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Kathy & George Zimm
Mickleton, NJ
2006 Coachman Epic & 2013 Chevy Equinox Toad
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06-12-2008, 02:52 PM
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#7
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Senior Member
Tiffin Owners Club Ford Super Duty Owner Coastal Campers
Join Date: Sep 2006
Location: Monterey, Tn
Posts: 1,089
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Master Chief;
I'm not an expert, but a pssst sound means the possibility of air, and to my way of thinking, air is not good in the brake system. Also, it would be doubtful that a vacuum would make a sound. Like I said, not an expert, but just a thought.
Bob
__________________
2012 Tiffin Allegro 34 TGA
Ford V-10 22000 lb chassis
Brake Buddy Advantage,
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06-13-2008, 01:40 PM
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#8
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Senior Member
Join Date: May 2007
Posts: 100
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Ron,
The brake fluid cap should be vented. If so the vent is probably blocked. Try replacing it.
Randy
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06-13-2008, 06:19 PM
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#9
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Senior Member
Workhorse Chassis Owner
Join Date: Sep 2007
Location: st.charles mo.
Posts: 1,482
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The master cyl. is not vented directly to the outside air. It has a rubber seal between the fluid and the air. As the fluid level goes down the seal goes down with it. Sometimes if it hasn't pulled down far enough to unfold the seal you could get a sound like that when removing the cap. It just means it was sealed good after all air and humidity are enemys of brake fluid.
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