i am a newbie here so bear with me... i have a 55 ford f100 that i am restoring. (and yes i did a massive search and couldnt find anything) i bought a brand new brake master cylinder and and brake booster. the problem i ran into is that the master cylinder has 3/8" ports, and the original lines and connections are all 1/4". so i plan on running new lines for the all 4 drums... i dont have a lot of money to upgrade to all the brakes to disk... so i was wondering if there were some direct bolt in cylinders that would fit the bolt holes that were 3/8" inlets on the cylinders? can anyone help this ?

 

Welcome to the site. Are the 3/8 fittings inverted flare? If so weatherhead makes adaptors from one size flare to an other.

 

I'm not sure... But I haven't run the 3/8 lines yet... I wana run everything in 3/8. And I would rather not use reducers... That would kina defeat the purpose of running everything larger diameter.

 

A trip to your local NAPA or better auto parts store will be very helpful in your quest. They have all kinds of fittings and adapters available to help put your brakes back together.

 

You don't want to use 3/8 lines for brakes. That's fine for moving large volumes of fluid, like fuel, but that's not the idea behind brakes. Smaller lines will keep your pressure up, which is important, and keep pedal effort normal.

 

Thanks for your replies guys. Can you tap and drill out the stock cyliner inlets?

 

I didn't know that.... So a reducer would be best? Or maybe a smaller lines and reducers at the booster?

 

No, you can't drill and tap your cylinders. These are not pipe fittings. The lines seal against a seat inside the cylinders, master and wheel, and those need a specific size and fitting to make work. If your m/c seats truly need 3/8 fittings, it's best to use a reducer to match them to your line fittings.

 

Yes,
….most references go by the line size, 3/16 is the small stuff and ¼ is the larger but not used much, the actual fittings have sizes of course but it gets real complicated fast.

 

ok... thanks for the info... i'll see if the lines are 3/16 or 1/4 or whatever? and i'll check the m/c to make sure its a single or double flare ?

 

All brake lines are double flare. That's a DOT regulation.

 

thanks, i'm gona look for fittings tomorrow.

 

Except for all of the ones that are not?

Everything I have touched made in the last several years was bubble flare, not inverted double flare.

 

Is bubble flare actually doubled? …………..If so, would that make it double bubble (like the gum)?

 

Lol......