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Dual master cylinder conversion
Posted by: Jamison82 ()
Date: February 20, 2012 05:15PM

Does anyone have a parts list or instructions for converting to dual master cylinder on a 1965 Corsa?

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Re: Dual master cylinder conversion
Posted by: Gregory_Miller ()
Date: February 20, 2012 05:16PM

Clark's Corvair parts sells a complete system to do just that, with clear and detailed instructions.

Greg Miller
Eugene, Oregon

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Re: Dual master cylinder conversion
Posted by: Jamison82 ()
Date: February 20, 2012 05:20PM

Is is cheaper to buy the part separate? I figure corvair dealers would mark up the price since it's an upgrade.

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Re: Dual master cylinder conversion
Posted by: Gregory_Miller ()
Date: February 20, 2012 05:24PM

You could probably get the items seperately, but you'd need tubing benders and flare tools to make the new lines. The Corvair vendors might get a bit more for them, but if you buy it all seperately, you will not get the instructions and pre-fabricated new brake lines.

Greg Miller
Eugene, Oregon

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Re: Dual master cylinder conversion
Posted by: 66vairman ()
Date: February 20, 2012 05:25PM

This has come up here a number of times. In the tradition of Matt - search.

Personally I don't like the Clark's line routing from the master cylinder (won't work on A/C cars either).

Pics should still be here of alternative line routing, but sometimes during site maintenance things get purged.

If you can't find old posts and pics then ask and I can post later.

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Re: Dual master cylinder conversion
Posted by: Jamison82 ()
Date: February 20, 2012 06:00PM

Thanks guys, I'll stop being lazy and search.

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Re: Dual master cylinder conversion
Posted by: upnorth1 ()
Date: February 20, 2012 11:50PM

make sure you get the benefit of separate wells which protect you in case of a failure. I switched, and am now under the impression that there is no check valve separating the master cylinder wells. without that, why bother? I used a MC from a 68 Camaro from Flaps.

I believe the most important thing is to install new high quality brake lines, and also used new brass fittings. I don't want to worry about failure caused by rust over 50 years.

Please, if I am wrong, someone correct me so I can "feel" safer.

bob

Chaplain Bob
135 miles from Canada

AT THE TIP OF LAKE SUPERIOR
1961 Loadside 110 140 4 speed, 30 over. 4 speed
1966 Corsa clone
1966 4 door 110 pg

DON'T mess with Old Men, we didn't get old by being, STUPID!!!

\/ this is a mile from my house... \/

Click for Hermantown, Minnesota Forecast

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Re: Dual master cylinder conversion
Posted by: 52bagman ()
Date: February 21, 2012 12:47AM

My way is to get dual master from flaps, the lines from a 67 and up car and the brass block on the fire wall under the dash. Pics are from a 66 sedan that I switched recently.

Sam C. Saunders,Pt. Pleasant WV
68 500 cp 95 pg ash gold
66 Monza cp 110 4spd black
68 500 cp 95 3spd blue "DAIRY QUEEN CAR"

1 link2 linkPhotobucket

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Re: Dual master cylinder conversion
Posted by: Gregory_Miller ()
Date: February 21, 2012 01:33AM

That's a good looking install, 52bagman! I still have my single master cylinder on. I'll re-finish my trunk and go dual possibly next fall.

Greg Miller
Eugene, Oregon

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Re: Dual master cylinder conversion
Posted by: cecilw ()
Date: February 21, 2012 03:04AM

I did mine a little differently.

Purchased the New Dual Master cylinder from the local Napa store. I didn't like how the factory brake lines came out under the dash thumbs down so I re-routed everything behind the trunk. I know it was a lot of work, but I liked it. thumbs up The New brake lines were hand fabricated using stainless lines. Front brake "T" was relocated behind the front cross member. I fabricated a cover to protect it and hide it from view. DOT 4 Synthetic brake fluid put in. Rust....what rust?

Just another way to do it?? It sure cleaned up the under dash area.

See photo"s

BEFOREAFTERLost in the 60s...
BEFOREAFTER

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Re: Dual master cylinder conversion
Posted by: corvairdoug ()
Date: February 21, 2012 03:09AM

Jamison, there's a place online, called Classic Tube. They sold me a set of 2 pre-bent STAINLESS lines, just for the trunk area.I converted a 66 over to 68-9 style. It turned out exactly like 52 bagman, as seen above. The lines went right in, assembled nicely.
Good Luck!

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Re: Dual master cylinder conversion
Posted by: upnorth1 ()
Date: February 21, 2012 05:24AM

This was sent top me as a PM: thanks a bunch!!!

dual master cylinder
From: 66vairman
To:
upnorth1
Date: 02/20/2012 08:10PM

Bob

You asked about separate reservoirs of a dual brake system.

It's a misconception that the two sides are totally independent so if one circuit fails you still have full stopping power on the other circuit.

The front and rear FLUID in the reservoirs IS completely isolated. A leak on one circuit cannot cause a loss of fluid in the other circuit (if the master cylinder is good).

Mechanically the circuits are NOT separate. O.K. it seems confusing. Basically there is a centering spring between the front and rear circuit plungers in the master cylinder so variations in the fluid volume between the two circuits can be slightly different. This allows a pressure balance to exist during normal operation.

If one circuit leaks then the middle spring in the master cylinder will compress to it's stop before pressure is placed on the good, or non leaking, circuit piston. So yes the good remaining circuit will work, but the brake pedal tends to travel quite far before the brakes seem to work, often surprising people.

It's a shame that folks are not educated about what to expect during a single circuit brake failure. BTW a car does not stop well on JUST the front or rear brakes, but it will stop.

The same lack of education caused a problem with early ABS brakes. When the ABS kicked in the brake pedal vibrated and folks tended to back off the pedal, which confused the ABS. Accident reviews of this problem caused some manufacturers to actually cancel ABS for fear of a liability problem. The newer cars use a computer to take over when the ABS is activated and maintains maximum stopping/anti-skid ability until the driver COMPLETELY releases the brake pedal.

If you have any questions, the reply. Regards.

Chaplain Bob
135 miles from Canada

AT THE TIP OF LAKE SUPERIOR
1961 Loadside 110 140 4 speed, 30 over. 4 speed
1966 Corsa clone
1966 4 door 110 pg

DON'T mess with Old Men, we didn't get old by being, STUPID!!!

\/ this is a mile from my house... \/

Click for Hermantown, Minnesota Forecast

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Re: Dual master cylinder conversion
Posted by: gmorphan ()
Date: February 26, 2012 01:59AM

I went a little different route with the dual master cylinder scenerio, opting for twin masters.

Brake bias is adjustable via a remote knob connected to the pedal unit under the dash.

Bob Manwaring, Kingston, TN

'69 500 Coupe #1432

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Re: Dual master cylinder conversion
Posted by: ihscomputers ()
Date: February 26, 2012 11:39AM

Bob (gmorphan):

Does your car have front disc brakes?

Do you have a parts list for that set-up??

Dean F. Gemberling
Columbus, Georgia
CORSA Eastern Division Director

Click here for the slideshow of my '69 Monza vert

1962 Rampside - ORANGE - Driving & showing it
1964 Monza Convertible - WHITE - In pieces awaiting restoration
1969 Monza Convertible - AZTEC BRONZE - Driving & showing it

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Re: Dual master cylinder conversion
Posted by: Bill Warren ()
Date: February 26, 2012 12:29PM

Clark's fittings are on the left. Underground's fittings are on the right. Obvious choice for me.

Bill Warren
Decatur, AL
65 Corsa
68 Monza


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Re: Dual master cylinder conversion
Posted by: gmorphan ()
Date: February 26, 2012 02:42PM

ihscomputers Wrote:
-------------------------------------------------------
> Bob (gmorphan):
>
> Does your car have front disc brakes?
>
> Do you have a parts list for that set-up??


My whole car started out as "a street version of my old racecar centered around a 4-wheel disc brake system". eye rolling smiley How crazy was that idea?
So this is a 4-wheel disc set-up that I've come up on my own. It's based off of what I could buy out of race catalogs...Wilwood 12" rotors, Speedway aluminum top-hats, Wilwood Aluminum calipers, custom fabricated caliper brackets, braided brake hoses from Summit, Tilton master cylinders and brake bias bar with custom fabricated Corvair pedal unit. The system is designed to be very adjustable (seeing as I'm no brake engineer) with small bias adjustments able to made remotely by the driver or big changes by swapping out master cylinders with different bore sizes.

So YES....I've got a parts list, however it's got a bunch of custome fabricated parts too. But hey...it's not rocket surgery either! winking smiley

Bob Manwaring, Kingston, TN

'69 500 Coupe #1432

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Re: Dual master cylinder conversion
Posted by: jimmyo ()
Date: February 26, 2012 02:55PM

I was wondering about doing a dual master cyl on my 62 Greenbrier. I seem to remember seeing a kit somewhere, does anyone know of this? or what you need to do it?. Thanks!

Jim O'Connor
45 miles north of The Bronx, N.Y.
1962 Greenbrier 110 4spd
1964 Monza Convertible 110 PG
"Wherever you go....There you are"


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Re: Dual master cylinder conversion
Posted by: gmorphan ()
Date: February 26, 2012 02:59PM

jimmyo Wrote:
-------------------------------------------------------
> I was wondering about doing a dual master cyl on
> my 62 Greenbrier. I seem to remember seeing a kit
> somewhere, does anyone know of this? or what you
> need to do it?. Thanks!


The bottom of this page...
[www.corvair.com]

Bob Manwaring, Kingston, TN

'69 500 Coupe #1432

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Re: Dual master cylinder conversion
Posted by: jimmyo ()
Date: February 26, 2012 03:10PM

Thanks Bob, I knew I saw It, but I didn't think I saw it at Clarks, DUH!. My mis-spent youth is finally catching up to my brain.

Jim O'Connor
45 miles north of The Bronx, N.Y.
1962 Greenbrier 110 4spd
1964 Monza Convertible 110 PG
"Wherever you go....There you are"


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Re: Dual master cylinder conversion
Posted by: nirvairna ()
Date: February 26, 2012 05:42PM

Bill Warren Wrote:
-------------------------------------------------------
> Clark's fittings are on the left. Underground's
> fittings are on the right. Obvious choice for me.

that is a super clean installation - does anyone know what that MC originally came from?

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