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#1 |
Registered User
Join Date: Aug 2015
Location: Oceanside, California
Posts: 7
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Why is brake master cylinder empty?
I just returned from a extended stay way(12months) from home and had my truck in storage. Everything was fine with it, except when I checked my OEM master cylinder resevoir level - it was bone dry. I do not see any leaking around my brake lines to the drums. I am surprised as to this - I filled the resevoir back up, bled the brakes and "all is well" - or so I think. Is there anything I should be concerned for? It is puzzling that my resevoir was empty after the vehicle being in storage for 12 months. Is this normal? Or do I need to do more investigation and determine the culprit to the fluid loss. Thanks in advance.
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#2 |
Registered User
Join Date: Mar 2010
Location: Camperdown Vic Australia
Posts: 230
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Re: Why is brake master cylinder empty?
just a thought. check firewall or floor possible leak at back of master cyl
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#3 |
Moderator
![]() ![]() Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Why is brake master cylinder empty?
Oh you "need" to investigate.
__________________
Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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#4 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,630
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Re: Why is brake master cylinder empty?
X2....dont trust it..
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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#5 |
Moderator
![]() Join Date: Dec 2012
Location: ON, Canada
Posts: 2,157
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Re: Why is brake master cylinder empty?
Leaking wheel cylinder (if there is no puddle on the floor). Get the drums off...
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#6 |
Senior Member
![]() Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: Why is brake master cylinder empty?
Since you need to work on it I would do the brake split and go to the dual pot master cylinder. Just so much safer if something happens like you have going on now.
Jimmy
__________________
60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
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#7 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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Re: Why is brake master cylinder empty?
Does your mc have the rubber gasket under the cap? Confirm whether wheel cylinders are leaking by removing the drum, can’t always tell just by looking for a puddle. I wouldn’t just replace the mc until you know why it drained. If you do replace it, then I concur with above comment about a dual res mc upgrade is a worthwhile upgrade for safety. Several threads on here for how to do that.
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#8 |
Registered User
Join Date: Aug 2015
Location: Oceanside, California
Posts: 7
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Re: Why is brake master cylinder empty?
Thanks to all. I found the "culprit". My left rear slave cylinder is the leaking cyclinder. I decided that I will replace the master cylinder and all four cylinders. I want to do the upgrade to dual master, but needed an expedient route to get my truck back on the road - its my daily driver. I looked up the conversion to dual master cylinders, looks pretty straight forward. Regards - joe
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#9 |
Registered User
Join Date: Aug 2015
Location: Oceanside, California
Posts: 7
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Re: Why is brake master cylinder empty?
It does have the rubber cap under the metal cap. What does that thing do anyways?
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#10 |
Moderator
![]() Join Date: Dec 2012
Location: ON, Canada
Posts: 2,157
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Re: Why is brake master cylinder empty?
Seals against air/moisture.
OP: glad you found the issue. I went through the same thing. Get the 67 truck master. Replumb the lines. FRONT port on the master to the front brakes, one line down to the splitter that you can reuse. REAR port to the rear line, use a connector, not a compression fitting! |
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#11 |
Registered User
Join Date: Aug 2015
Location: Oceanside, California
Posts: 7
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Re: Why is brake master cylinder empty?
Thumbs up...
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brake, fluid, leak |
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