Changing drums to disks

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Frank Dinatally

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I have made the change from drums to 4 wheel disk brakes on my 65 barracuda. I am having issues with master cylinder issues by having a very high peddle. I tried 2 different wilwood master cylinders and the peddle was almost touching steering wheel. Has a shop that does a lot of conversions and they suggested a 1977 corvette cylinder and is pretty much better peddle but is still higher than needed. Plus if you lift up on the peddle for any reason the rod falls out and you have no brakes. I know someone has the answer and as always thanx in advance

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We're it my car, I'd send the w/wood m/cs back, get either the straight bolt on stock cast iron 15/16 master cyl OR his 2 - bolt modern plastic 15/16 M/C from DrDiff, with correct pushrod that won't fall out, and pedal height .
www.doctordiff.com

Mopar Aluminum Master Cylinder Kit

Package includes new, aluminum master cylinder with large rectangular reservoir, billet aluminum 4 hole or 4 stud adapter and push rod retaining ring.
www.doctordiff.com www.doctordiff.com

Keep in mind you won't get good pedal till all pads are firmly in contact with the rotors and properly bled.
I prefer the vacuum bleeder.
Good luck .
 
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As far as the rod falling out, the OEM masters have a socket in the piston with a rubber grommet that the rod snaps into. It can be almost impossible to remove the rod once it's in there. The piston is retained by either a small bolted-on tab or a bolted-on boot. Any MC should have some kind of positive system for retaining the rod. I wouldn't use one that didn't.

Did you consider that your rod may be too long (high pedal)?
 
power or manual brakes?

if power, was it originally power and you're using stock components? or is it an aftermarket set up?
 
Frank Dinatally said:
It is Manuel and aftermarket
Click to expand...
was the car originally power or single pot master?

what i'm getting at is that if you're using the original push rod that may be part of the problem.

you likely need an adjustable push rod, one that is machined for the retainer.

i like this one:
www.doctordiff.com

Mopar '62 -'70 Adjustable Master Cylinder Push Rod

Super-Duty heim joint style adjustable push rod fits all Mopar A-bodies and '62-'70 B-bodies equipped with manual brakes
www.doctordiff.com www.doctordiff.com

personally i'd adios that vette master and get the two bolt with an adapter like so:

www.doctordiff.com

Mopar Aluminum Master Cylinder Kit

Package includes new, aluminum master cylinder with large rectangular reservoir, billet aluminum 4 hole or 4 stud adapter and push rod retaining ring.
www.doctordiff.com www.doctordiff.com
 
junkyardhero said:
was the car originally power or single pot master?

what i'm getting at is that if you're using the original push rod that may be part of the problem.

you likely need an adjustable push rod, one that is machined for the retainer.

i like this one:
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personally i'd adios that vette master and get the two bolt with an adapter like so:

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Click to expand...
Leaning that way
 
You either have the wrong m/c.....or the wrong pushrod.....or both.
 
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