64 K10 horizontal booster & master cylinder upgrade to mate with corp 10 bolt front

[pheengurs]

ok. I've spent alot of time trying to find specific answers and like all posts similar to this one, have come up short, trying to find what I need myself...

SO

lets ask for help shall we?


on my 64 k10 stepside, I have swapped in a 1987 corporate 10 bolt front axle. and now I need to get the brakes done.

I've figured out all the plumbing issues, and have the hoses lines and calipers, and even a disc/drum proportioning valve from a late 80's truck. However my issue is with the stock horizontal brake booster & associated bracketry and figuring out what to do about it, and what booster/master cylinder options will work.

to put things in a price perspective, the local napa price for a new booster & master cylinder of the 1987 year was around $150 or so.

now I've got those parts in the garage, and its quite obvious the booster won't work. too large diameter, too long bracketry, and 6 bolts to redrill = not cool, too much work to fab to get working, and I don't have the time nor do I want to risk my safety...

so here's a direct question: can I use the stock 64, horizontal power brake booster with a 1987 or different year disc/drum master cylinder?

will it bolt onto the old booster? (I should be able to check out if the 1987) tomorrow)

and the rod between the booster and the master cylinder? how does one know/determine what length its supposed to be?

will the stock booster be able to provide enough 'boost' to run newer 1987 front disc brakes?


how does that all work? how do I know what 'bore' length? or is that something else?

I know there are a HUGE pile of posts on upgrading to disc brakes...I've read a ton of them. few mention specific issues/problems with mating the brake pedal to the booster and the booster to the master cylinder -- which is where I'm at.

has anyone done this? can you provide details on how did you get it all to work?

I have some pics of my current stock 64 power brake setup that I can post up later if that'll help, however there is a post that already shows the horizontal setup -- http://67-72chevytrucks.com/vboard/s....php?p=2954872 -- and touches on what I'm talking about but not specifically .. so any help is MUCH MUCH APPRECIATED!

[duallyjams]

Happy reading
http://www.67-72chevytrucks.com/vboa...=1#post3257836

[pheengurs]

yes I've already read that one, all three pages of it... a great idea, and superb to see products specifically designed for the era, however nothing in that post answers my questions, that I've posted here.

it explains how to use straight through booster & master cylinder combos, and how they work super great with that sixty dollar steel bracket.

I've done many searches, many different ways. on many forums and search engines. I've sifted through reams of information, and come up short.

my question is regarding the stock horizontally mounted booster, and whether or not it will work with more modern master cylinders, or anything newer than 1971?
AND will that booster have enough 'boost' to run front disc brakes designed for a much larger 1987 booster?
AND what is all this stuff about bore size? and rod length? is there anyway to change to a disc/drum master cylinder on the stock booster without having to mess with the pedal rod length and the booster to master cylinder rod length?

here's a couple pics of the setup I've got...

[pheengurs]

the above pics were one of my truck in its natural environment -- meaning it's a 4wd that gets used as a 4wd...

and the second is of the 1987 corporate 10 bolt front diff that I've installed under there as of just a few days ago... it is the source of the brake upgrades, and why I bought all this 1987 brake hardware / booster / master cylinder...

and why I've ended up reading so much info online, trying to find a way to make this stuff work...

I've given up on using the 1987 booster, it's too big, and too different.

What I want to do is swap the new 87 booster with a new 64-66 booster, and mate it up with a disc/drum master cylinder to power those 1987 brake calipers on that front axle...

again, any info/advice/insight you can provide is greatly appreciated!


here's the pics of what I have currently:

[64fleetside]

I have an original '64-66 booster using a 1980's C10 master, works fine. Mine's 2wd drive, '71-87 discs up front, reg '71 drums on rear.

[pheengurs]

64fleetside, is your 80's C10 master cylinder the all metal kind or the kind with the plastic resovoir? is it an early 80's master cylinder? feel free to post a pic of your setup here...

how did you get them to mate up?
did you have to mess with the rod between the booster and the master cylinder?
do you have that same horizontal bracket, too?

the master cylinder that's stock for 1987 setup that I bought to match the corp 10 axle & brakes is a plastic kind. I just checked the rear of it, that's supposed to go into the front of the booster -- and it definitely won't fit on the stock 1964 booster. I compared the ends and not only is the diameter of the 'bore'??? too large, but the depth of the 'bore'??? is too shallow.

in the post I quoted earlier, Joe321 said he's got a master cylinder from a 1971 and a booster from a 66. But no further details...

[Clyde65]

I would measure the original master where the rod goes into it, then measure a new master and that will tell you if it will work or not, might need a micrometer, most truck masters are 1" or 1.125" I believe. Corvette dual masters are also very popular.

[joe231]

I'm sorry that I'm late to the party.....
looks like you got it figured out,

[pheengurs]

hey no worries... I've responded to posts years old if it was open ended...

so I have all the brake lines, connections, joins hoses and everything all plumbed up. I had alot of problems with leaking connections..not only with all three of the flares I made, but with store bought lines & brass fittings/connections... It's the rear lines that are giving me the most trouble. But also the lines from the m/c to the prop valve, and then out the rear of the prop valve...

can someone tell me why & have different sized m/c & prop valve connections between them & also different size for rear line? WTF??? why isn't the entire system ALL 1/4 or ALL 3/16? Right now I have around 5 different sizes between the m/c, prop valve, and rear line...

anyway, I've bench bled the m/c, I've individually bled each brake, starting from the brake farthest from the m/c.

and have just finally sorted out a huge pile of other problems and finally have all four tires on the ground... lemme tell you, a front axle swap that includes a disc brake upgrade may seem easy on paper, even to a novice, but in reality is VERY difficult, at least when you're upgrading from the 60's to the 80's !!!

I'm shy of pics right now. I'll take some today for sure and post em up soon. I'm very much hoping to have this truck on the road today...