I am almost ready to do a Wilwood disc brake conversion on my dart and was asked a question on the master cylinder.

There is more than one master cylinder to choose from and I have no
idea how to judge which one is the correct one to purchase.

On the last page of the wilwood kit # 140-2712b has 4 to choose from

a 3/4 high volume
a 7/8 high volume
a 1 inch high volume
and a 1 1/16 tandem master cylinder, that the wilwood person suggested that I get. He suggested that I call a place in CA for advise and to purchase from them, but I would like a little input from people who may
have already done this kind of work and has the right suggestion.

I chose this kit because I would like to stay with the SMB and I have not seen any other company that will allow you to do this without going to the LPB. I have the factory mags and want to keep them.

So far the total comes to about $900 and change for the kit, proportioning valve, brake fluid, and SS brake lines (as suggested) and the 1 1/16 cylinder.

I appreciate any serious advise / replies to this

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67 Dart GT convertible
"225 Slant 6"
Super 6 and 2.25" exhaust.

The smaller the m/c size; the easier the pedal will be, but with a longer pedal travel........

Conversely a large m/c size will have a hard pedal with short pedal travel...........


What you need is the diameter of the pistons on the caliper and then compare the total area of all the caliper pistons (multiple by 2 if sliding caliper) to the area of the m/c.......

Hopefully someone has what the ratio should be.....................

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Your reply sounded similar to the guy from Wilwood.
His ratio was a 6 to 2, measuring the throw from the pivot point from
the brake pedal to the ..... I lost him there..

I was looking for a simple answer, and got the technical stuff.

I guess this is not a get part "b" and it is done.

I am trying to get the car a little safer so I am comfortable with my wife
driving it. If she should get in a panic situation, I don't think she would
have the leg power to stand on the non powered drums to save it.

I talked to a few local mechanics /race car drivers who use Wilwood stuff and they are happy with it. the only time it needed to have parts replaced is if they had a accident involving the brake area. They are positive about this product holding up.

thanks for your input.

Any others?

Thanks
Matt

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67 Dart GT convertible
"225 Slant 6"
Super 6 and 2.25" exhaust.