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Old January 4th, 2010, 10:44 AM   #1
shok
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Default WTF with my f*&king brakes?

So I'm sort of at a loss with my brake issue on my 65 ghia. The master cylinder failed, it would go to the floor with a faint farting sound and the fluid would disappear, I believe into the tunnel since there is no visible leak anywhere, and I pulled the drums off to check.

I get a new MC from Ebay in a Wagner box and while bleeding it it goes from good to bad and gives same symptoms as the first one.

I get a 2nd new one from a shop in stockton in a TRW box, install it, gently bleed and finish up. Brakes feel great! Give it a stomp like I would in a fast stop and squish same symptoms as b4, so seems its ruined now also.

Ideas?

Anyone have info on switching to a dual circuit MC? Would I be better off with a Type2 MC? I need to get this fixed for not a lot of money but an upgrade would be desired to atleast dual circuit.
I'm also open to suggestions for a disc conversion but it would have to be cheap. I can't afford the wide 5 disc kits but if a 4lug kit works for a couple hundred I'm cool with that.
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Old January 4th, 2010, 11:39 AM   #2
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Default Re: WTF with my f*&king brakes?

Where is th.efluid going.

Ther.eshould be a puddle somewhere. You find that and that will point you in the direction of your problem.

the brake line runs inside the car next to the tunnel on the drivers side. Follow the line from the master cylinder to the back of the car where it splits. look for leaks along the way.

Also look at the back of the wheels to see if they are coated in fluid. this will tell you if you have a bad wheel cylinder.
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Old January 4th, 2010, 12:04 PM   #3
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Default Re: WTF with my f*&king brakes?

I agree with TP, it is not a bad M/C. You have a leak somewhere. Chase the lines and you will find it. Especially if you have pumped a lot of fluid, it has to be wet somewhere.
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Old January 4th, 2010, 12:25 PM   #4
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Default Re: WTF with my f*&king brakes?

Line rusted through somewhere ?
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Old January 4th, 2010, 12:34 PM   #5
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Default Re: WTF with my f*&king brakes?

no fluid leaking at the brakes, pulled the drums off and checked. from what i've read when the MC goes it can squirt the fluid past the piston into the tunnel.
Now the brakes worked for awhile, which makes me think if it was a rusted thru line they never would have worked.
TP are you saying the line is outside the tunnel?
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Old January 4th, 2010, 12:36 PM   #6
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Default Re: WTF with my f*&king brakes?

yank the master back off and check the napoleon hat where it bolts into. if there is lots of fluid then there you glo.
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Old January 4th, 2010, 12:36 PM   #7
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Default Re: WTF with my f*&king brakes?

and yes the line is outside the tunnel on the drivers side runs right down the edge of the tunnel under the carpet.
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Old January 4th, 2010, 01:15 PM   #8
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Default Re: WTF with my f*&king brakes?

ok i'll be pulling this master off, the last two were wet in the area it bolts too.

any ideas on the upgrade questions in my original post?
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Old January 4th, 2010, 01:50 PM   #9
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Default Re: WTF with my f*&king brakes?

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ok i'll be pulling this master off, the last two were wet in the area it bolts too.

any ideas on the upgrade questions in my original post?
It sounds like you have the leak right at the M/C. Is your fitting boogered up so it does not seal correctly? You may need to put a new line or at least a new end on the existing line, but you might not have access without taking it out. If so just put a new line, they do rust out sometimes.
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Old January 4th, 2010, 04:33 PM   #10
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Default Re: WTF with my f*&king brakes?

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ok i'll be pulling this master off, the last two were wet in the area it bolts too.

any ideas on the upgrade questions in my original post?
Sounds like the line is bad. check it where it goes thru the body, next to the m/cyl. Also check next to the pedal assy.
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Old January 4th, 2010, 04:48 PM   #11
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Default Re: WTF with my f*&king brakes?

ok i'll check that line. its not leaking where the fittings connect.
i really don't think its the line, why would it be ok for a little while and then leak right after bleeding for two master cylinders in a row?
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Old January 4th, 2010, 04:50 PM   #12
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Default Re: WTF with my f*&king brakes?

trapped air will act like you explane as well.
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Old January 4th, 2010, 04:52 PM   #13
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Default Re: WTF with my f*&king brakes?

Did you bench bleed the master cyl first ?
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Old January 4th, 2010, 04:55 PM   #14
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Default Re: WTF with my f*&king brakes?

Two things I would look at, first leaks in the hard line running to the rear brakes as previously mentioned, the other thing although a long shot is if the "new" parts came in a dusty old boxes, rubber parts have a shelf life, so maybe the seals in m/c have dry out. I know with VW OEM brake parts they are dated.
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Old January 4th, 2010, 07:35 PM   #15
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Default Re: WTF with my f*&king brakes?

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trapped air will act like you explane as well.
But would trapped air make the fluid disapear? I can keep pumping the pedal and the fluid goes away.
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Old January 4th, 2010, 07:39 PM   #16
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Default Re: WTF with my f*&king brakes?

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Did you bench bleed the master cyl first ?
I didn't bench bleed it since I didn't have the stuff to rig it up. It didn't come with the stuff to bench bleed like the domestic MC come with.

And the MC didn't seem old or dusty.
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Old January 4th, 2010, 07:49 PM   #17
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Default Re: WTF with my f*&king brakes?

What my dad did in lieu of bench bleeding, was to pressurize the MC through the reservoir, using compressed air. Don't really understand how that worked, but it did. Before he did that, he could not build any brake pressure. This was on my '69, on Guam.
First bench bled MC I did, was for my bro's Chevelle.

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Old January 5th, 2010, 09:24 AM   #18
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Default Re: WTF with my f*&king brakes?

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But would trapped air make the fluid disapear? I can keep pumping the pedal and the fluid goes away.

Nope you have a leak.
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Old January 5th, 2010, 06:50 PM   #19
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Default Re: WTF with my f*&king brakes?

maybe its got a crack where it goes through the bulkhead, and its just filling it up, hence why you see no puddle.
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Old January 9th, 2010, 01:34 PM   #20
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Default Re: WTF with my f*&king brakes?

ok found the leak, rusty section near the seat rail, rest of the line looks good. i'm at a loss as to by a leaky metal line only leaked part of the time, other times the pedal was fine. maybe bits of rust in the system would float around and sometimes cover the leak?
anyway thanks all, now to see if the local flaps has what I need.
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Old January 9th, 2010, 01:57 PM   #21
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Default Re: WTF with my f*&king brakes?

Probably a tiny enough section that it held pressure but when left alone, it would bleed itself off as in wick out into the surrounding rust.
Another common place is around the pedal, we had a super that had a gallon of sand around, dug it pout, it was saturated in fluid.

Glad ya found it finally!
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Old January 9th, 2010, 02:01 PM   #22
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Default Re: WTF with my f*&king brakes?

Time to change all the lines and hoses.
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