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Master Cylinder for Disc Brakes?
Posted by: kbryant ()
Date: April 14, 2018 02:22PM

I just installed a disc brake kit for all four wheels. However, my current master cylinder wont do. It goes almost all the way to the floor. I was told that it is because calipers have more displacement than wheel cylinders so I need a master cylinder with a larger bore. So, which master cylinder should I get?

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Re: Master Cylinder for Disc Brakes?
Posted by: MattNall ()
Date: April 14, 2018 03:19PM

Wrong!! Fluid does not compress! Air does..

After Bleeding....pushing on the brakes to seat the pads... pedal should be high and hard...

What model Vair do you have and what MC?





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Master Cylinder for Disc Brakes?
Posted by: 66vairman ()
Date: April 14, 2018 03:38PM

As Matt said IF there is air in the system that could be the problem, BUT yes you can end up with too little MC displacement.

Some here have done disc brake conversions, number of options. With out specifics on what you installed it is difficult to give an answer to your problem.

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Re: Master Cylinder for Disc Brakes?
Posted by: moomba32 ()
Date: April 14, 2018 04:31PM

I added discs to front only on my 66 and didn't changed the MC, my pedal is good and my brakes work great.

Don Marlowe
66 Monza 2Dr 140/pg
64 Spyder convertible now, 110/pg
Eutawville SC

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Re: Master Cylinder for Disc Brakes?
Posted by: kbryant ()
Date: April 16, 2018 09:57AM

I was told that if I convert to 4 disc brakes that I will need a master cylinder for manual brake system with a 1.125 bore. But which one? There are hundreds of options.

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Re: Master Cylinder for Disc Brakes?
Posted by: firevair66 ()
Date: April 16, 2018 11:06AM

My 4 wheel system works well with the stock MC.

John Shoemaker,Riegelsville,PA.
1958 Impala Sport Cp. 348 ,pg/ac
61 Rampside full custom show truck
65 Monza 110/4 vert driver
65 Full Custom Monza 140 Cp
66 Monza 110/PG Vert
66 Corsa FITCH SPRINT Documented ( in Process,recondition)
66 CorV8 350 "firevair"Custom Show




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Re: Master Cylinder for Disc Brakes?
Posted by: TerribleTed ()
Date: April 16, 2018 11:24AM

firevair66 Wrote:
-------------------------------------------------------
> My 4 wheel system works well with the stock MC.


Are you actually running 4 wheel disk brakes with a stock single master cylinder?

---------------------------------------------------------------------------------------------------------

Avid Corvair hobbiest since 1984.
I have personally performed ground up restoration on over 20 Corvairs.
I currently work full time at restoring and repairing Corvairs.
Located in the Atlanta Georgia area.
[www.facebook.com]

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Re: Master Cylinder for Disc Brakes?
Posted by: Dan ()
Date: April 16, 2018 11:51AM

I used a master cylinder from a 1968 Corvette. I got the one specified for non-power with 4 wheel disc brakes. Worked great ‘

Dan
Chandler, AZ
1966 Corsa Turbo Convertible
[corvaircenter.com]

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Re: Master Cylinder for Disc Brakes?
Posted by: kbryant ()
Date: April 16, 2018 12:29PM

No. I'm not running anything yet. Just trying to put it together and need to know which MC to get.

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Re: Master Cylinder for Disc Brakes?
Posted by: wv-geo ()
Date: April 16, 2018 01:25PM

A 1-inch bore master cylinder from a 67 Corvette non-power with 4 wheel disc brakes should work also.

You don't want a large bore master cylinder with non-power brakes, your pedal effort will increase.

You want a 1-inch bore or smaller for non-power 4 wheel disc brakes.

Dan Stark
Hurricane, WV

1961 Lakewood 500, 80HP, PG
1964 Corvair 500 Coupe, 140HP, 4spd (Christine)
1965 Mustang Coupe, 6cyl, 3spd

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Re: Master Cylinder for Disc Brakes?
Posted by: Phil Dally ()
Date: April 16, 2018 01:33PM

Just in case you ever thought about power brakes.

Now is the time to decide if you want them.

As you can see it has been done before.

Car pictured is a stock 110/PG.

Front disc and rear drum.

Stops on a dime!!!

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Re: Master Cylinder for Disc Brakes?
Posted by: thumper477 ()
Date: April 16, 2018 03:02PM

Phil,is that a vacuum booster?If so,are you running it by engine vacuum or a vacuum pump or a pump in combo with the engine vacuum?Where did you buy it from?Thanks.

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Re: Master Cylinder for Disc Brakes?
Posted by: Richard ()
Date: April 16, 2018 03:34PM

10# residual check valve on disc brake?

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Re: Master Cylinder for Disc Brakes?
Posted by: MattNall ()
Date: April 16, 2018 03:36PM

3 psi on Disc... 10 on Drum iirc





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Master Cylinder for Disc Brakes?
Posted by: Phil Dally ()
Date: April 16, 2018 04:20PM

That is Arch's Monza.

Private Message me for his info.

Ask about the cluster too.


edit: added the cluster.



Edited 1 time(s). Last edit at 04/16/2018 04:22PM by Phil Dally.

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Re: Master Cylinder for Disc Brakes?
Posted by: kbryant ()
Date: April 16, 2018 04:25PM

The guy who gave me the car said that he got the MC from clarks. I have a '66 and put El Dorado calipers on the back and S-10 calipers on the front. I don't see any air coming out of the line by my pedal almost hits the floor before stopping. Way too much travel.

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Re: Master Cylinder for Disc Brakes?
Posted by: Seth Emerson ()
Date: April 16, 2018 10:19PM

What did you do to bleed/adjust the rear calipers? Be exact.

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Re: Master Cylinder for Disc Brakes?
Posted by: MattNall ()
Date: April 16, 2018 10:41PM

Videos and more on adjusting Eldo rear Calipers w / e-brake





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Master Cylinder for Disc Brakes?
Posted by: cooterr ()
Date: April 17, 2018 01:55PM

The problem i believe is that when using the caddy calipers on thr back with
S10 on the front is that you do not have sufficient volumn to fill the four disk brake calipers. Hook up just the rear brakes and check pedal travel and stiffness, ,do the fronts the same way. A friend had the same problem when trying to put the same equipment on a 64. You need a larger piston size to provide the volumn of fluid that is needed to fill the pistons.

Tom Miller
Performance Corvair Group
Circle City Corvairs
Corsa

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Re: Master Cylinder for Disc Brakes?
Posted by: MattNall ()
Date: April 17, 2018 04:05PM

Tom!! Piston chambers are FULL after bleeding... Disc Pads only move 0.0010 - 0.0020" during application!

The Eldo calipers have to have the E-brake adjusted after final install...before bleeding..

See my previous ost.





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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