Disc Brake Conversion
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Disc Brake Conversion
I know this has been discussed ad nauseum, but I want to make sure my "shopping list" is complete. I have a '72 ford f100...
From the salvage yard I can get the following items off of a '74:
1. I-beams
2. spindles
3. proportioning valve
From an auto parts dealer, the following items for a '74 f100:
1. calipers/pads
2. rotors
3. master cylinder
4. brake hoses
I purchased s/s brake lines for my '72. Can I use them or do I need to purchase new lines for a '74?
Also, will my current booster work or do I need one for the '74?
As I understand it you use a kingpin from a '72. Why not a '74?
Anything else?
From the salvage yard I can get the following items off of a '74:
1. I-beams
2. spindles
3. proportioning valve
From an auto parts dealer, the following items for a '74 f100:
1. calipers/pads
2. rotors
3. master cylinder
4. brake hoses
I purchased s/s brake lines for my '72. Can I use them or do I need to purchase new lines for a '74?
Also, will my current booster work or do I need one for the '74?
As I understand it you use a kingpin from a '72. Why not a '74?
Anything else?
Last edited by tonpartain; Mar 22, 2006 at 10:35 PM.
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From: East Flat Rock NC
A 74 king pin has a different diameter, you will have to get king pins for
your 72. Also if while in the junk yard getting your parts, if they have other
73-79 trucks, and you want to make it easy on your self try to get your
front brake line brackets from two different trucks, from (pass) side they bolt
on to the (pass) side. The trucks i've dealt with in the past, the brackets
on the (drivers) side have one big rivit you will have to cut out!
Wally
your 72. Also if while in the junk yard getting your parts, if they have other
73-79 trucks, and you want to make it easy on your self try to get your
front brake line brackets from two different trucks, from (pass) side they bolt
on to the (pass) side. The trucks i've dealt with in the past, the brackets
on the (drivers) side have one big rivit you will have to cut out!
Wally
Fleet Owner
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From: Creedmoor, North Carolina
Ton, There are several ways to acheive the upgrade, and I dislike the way you are looking at it the most. There are several more items that you need that isn't listed, like brake light switch, brackets for holding the new lines, different lines for the front. etc. Why don't you add power steering at the same time?
The simplest method is to swap the complete I-beams under the truck, all pieces fit and if the donor truck was in aleignment it will remain.
Purchase the donor truck make the swap and then get rid of the carcus. This way there will be no surprises, and with some investigating you can get a front end tight enough, not to have to replace the kingpins. IMHO
John
The simplest method is to swap the complete I-beams under the truck, all pieces fit and if the donor truck was in aleignment it will remain.
Purchase the donor truck make the swap and then get rid of the carcus. This way there will be no surprises, and with some investigating you can get a front end tight enough, not to have to replace the kingpins. IMHO
John
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John,
Are you recommending unbolting the entire front crossmember from the '74 and bolting it onto my '72?
Also, I've already got power steering.
Chris
Are you recommending unbolting the entire front crossmember from the '74 and bolting it onto my '72?
Also, I've already got power steering.
Chris
Last edited by tonpartain; Mar 23, 2006 at 08:13 AM.
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The LMC part number is the same for a '66-'72 king pin set and a '73-'74 kingpin set, so I'd assume they are the same diameter.
Also, can I use the steering controls from my current truck or will I need to replace the tie-rod ends with those from a '74.
Also, can I use the steering controls from my current truck or will I need to replace the tie-rod ends with those from a '74.
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I also agree with jowalker, It is best to swap the I-beam and spindle as a unit. When you mix an match different year of spindles to different years of I beams, then it gets more involved, because of the different diameter sizes of king pins and steer bump stops.
King pin diameter and lengths
From 1967 thru 1974 half tons used the 0.8592" x 6.353".
From 1974 thru 1979 half tons used the 0.8593" x 6.483"
From 1967 thru 1970 three quarter tons used the 0.8592" x 6.353".
The three quarter tons and one ton trucks, depending on their Gross Vehicle Weight (GVW) used any of the three styles listed above.
Here is a thread which discuss the 1965-1972 disc brake conversion https://www.ford-trucks.com/article/...rd_Trucks.html
King pin diameter and lengths
From 1967 thru 1974 half tons used the 0.8592" x 6.353".
From 1974 thru 1979 half tons used the 0.8593" x 6.483"
From 1967 thru 1970 three quarter tons used the 0.8592" x 6.353".
The three quarter tons and one ton trucks, depending on their Gross Vehicle Weight (GVW) used any of the three styles listed above.
Here is a thread which discuss the 1965-1972 disc brake conversion https://www.ford-trucks.com/article/...rd_Trucks.html
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Okay, can I change everything below the pitman arm? In other words, can I change the center link, tie-rod end, drag link, the spindles, kingpins, i beams, and brake parts? I'd like to use my pitman arm and steering gear because the gear is a new unit from Red Headed Steering Gear.
Fleet Owner
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From: Creedmoor, North Carolina
Originally Posted by tonpartain
John, Are you recommending unbolting the entire front crossmember from the '74 and bolting it onto my '72?
Also, I've already got power steering.
Chris
Also, I've already got power steering.
Chris
John
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I spent the day at the junk yard pulling i-beams, spindles, disc brake stuff, etc. off a '74 f100 to install on my '72 f100.
The proportioning valve on the '74 was attached to a bracket on top of the steering gear, while the proportioning valve on my '72 is attached below the steering gear to the frame.
Questions:
1) Are all proportioning valves on '74 f100's attached to the top of the steering gear or are they usually attached to the frame?
2) The '74 did not have a booster attached to the brake master cylinder. Does that matter? (My '72 does have a booster.)
3) Are the brake light switches different? They appear to be the same.
The proportioning valve on the '74 was attached to a bracket on top of the steering gear, while the proportioning valve on my '72 is attached below the steering gear to the frame.
Questions:
1) Are all proportioning valves on '74 f100's attached to the top of the steering gear or are they usually attached to the frame?
2) The '74 did not have a booster attached to the brake master cylinder. Does that matter? (My '72 does have a booster.)
3) Are the brake light switches different? They appear to be the same.
More Turbo
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From: Western Canada
I made up a new bracket for the valve and mounted it to the frame in the stock location, then just made new lines to fit. I also used the brake switch from the donor and it worked with the connection on the factory harness, mine's a '69
Fleet Owner
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From: Creedmoor, North Carolina
Only a personal observation, I don't think it matters much where the prop. valve is mounted as long as it is included.
I made a multi upgrade when I did the swap on my truck. I rebuilt the engine and swapped in a C6, along with the complete I-beam power steering/brake setup at the same time. Tis nice knowing that you are driving a 40 year old truck with 28,000 miles on the rebuilt drive train. Should have many years to go before replacment is needed again.
John
I made a multi upgrade when I did the swap on my truck. I rebuilt the engine and swapped in a C6, along with the complete I-beam power steering/brake setup at the same time. Tis nice knowing that you are driving a 40 year old truck with 28,000 miles on the rebuilt drive train. Should have many years to go before replacment is needed again.
John
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More a pragmatic thing with respect to the location of the proportion valve. I'd like to just connect the current rear lines and order a set of prebent front lines for a '74.
My truck had power steering and power brakes, along with a c-6 tranny. I pulled the engine and transmission, both of which are being rebuilt. I'm planning on using this as a daily driver and don't want to have to do this again for a long, long time.
My truck had power steering and power brakes, along with a c-6 tranny. I pulled the engine and transmission, both of which are being rebuilt. I'm planning on using this as a daily driver and don't want to have to do this again for a long, long time.
Last edited by tonpartain; Mar 29, 2006 at 09:33 PM.
