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#1 |
Registered User
Join Date: Jan 2007
Location: vernon b.c.
Posts: 3,022
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why is my master cyl. doing this
My master cylinder is weeping slowly from the fr. resorvoir to the back one. Is manual brake setup with drum/disc setup on a 80,s truck. The old one did this so I thought there was something wrong so I replaced it with a new one and this one is doing it too. Where is my problem ?
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#2 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,652
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Re: why is my master cyl. doing this
I'm not sure I follow what your seeing....how can you tell?..,both sides should be full
__________________
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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#3 |
Registered User
Join Date: Jan 2007
Location: vernon b.c.
Posts: 3,022
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Re: why is my master cyl. doing this
the fr. fills up the rear one and then it leaks. This takes about about 3 weeks then I notice a spongy pedal and I then take a turkey baster and take some fluid out from the rear and put back in the fr. reservoir . The rear reservoir is full to the top and of course it leaks when I pull the lid off at this point. The pedal is now fine at this point
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#4 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,652
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Re: why is my master cyl. doing this
Ok I understand what your saying now
There is a seal between the reservoirs..but 2 masters doing the same thing makes me wonder if the issue lies elsewhere.. I'm wondering if your proportioning valve could be transferring fluid to the wrong side.. Might be worth swapping it out
__________________
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 |
Registered User
Join Date: Jan 2007
Location: vernon b.c.
Posts: 3,022
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Re: why is my master cyl. doing this
Ok I will have alook. At least it,s a starting point. Thanks
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#6 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,638
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Re: why is my master cyl. doing this
Is this truck converted from power to manual with the booster removed?
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#7 |
Registered User
Join Date: Jan 2007
Location: vernon b.c.
Posts: 3,022
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Re: why is my master cyl. doing this
no
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#8 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,638
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Re: why is my master cyl. doing this
So it’s stock then.
I was thinking pedal ratio might be the difference. Does your brake pedal have two holes in it where the brake rod attaches to it. |
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