The replacing of a c6 with t19. More than just the swap

[Gary Lewis]

Due to still waiting for the firewall reinforcement to arrive I cannot start actually putting this stuff together for good. So I threw the hydroboost/master in temporarily to check the brake lines...

While not quite perfect, I think I will be able to work them into a position where the lines do not touch each other, or anything else. As a bonus I think the stock brake line clamp may even work...

Yes, it is good progress. But I'm confused on why you didn't use the lines off the donor truck instead of changing the fitting? They should have just gone right on with no changes needed at all.

[IDIBronco]

Yes, it is good progress. But I'm confused on why you didn't use the lines off the donor truck instead of changing the fitting? They should have just gone right on with no changes needed at all.

Turns out it was an especially easy decision. The line for the front brakes on the part truck ran to a tee connector at the drivers front brake hose??? I am not exactly sure what the repair person on that job was doing. The rear line was pretty rusted and simply twisted off on attempted removal. I thought on the solution last night before bed and decided this is what I would try. No need to unhook the lines at the frame on the bronco this way. Redo the end of one line and tweak the shape of stock bronco lines. If it didn't work all I would loose is a little bit of my time and I would be ordering brake lines at that point (which I would have had to do anyway). That's simply the logic.

[Gary Lewis]

Turns out it was an especially easy decision. The line for the front brakes on the part truck ran to a tee connector at the drivers front brake hose??? I am not exactly sure what the repair person on that job was doing. The rear line was pretty rusted and simply twisted off on attempted removal. I thought on the solution last night before bed and decided this is what I would try. No need to unhook the lines at the frame on the bronco this way. Redo the end of one line and tweak the shape of stock bronco lines. If it didn't work all I would loose is a little bit of my time and I would be ordering brake lines at that point (which I would have had to do anyway). That's simply the logic.

Well, that certainly explains why you used the Bullnose lines. But it doesn't explain what someone was smoking when they teed into the hose.

Anyway, glad it worked out for you.

[IDIBronco]

Well, that certainly explains why you used the Bullnose lines. But it doesn't explain what someone was smoking when they teed into the hose.

Anyway, glad it worked out for you.

Haha.

To be completely honest I was speechless when I found this arrangement. I have never seen someone do something like this before.

[Ford F834]

Turns out it was an especially easy decision. The line for the front brakes on the part truck ran to a tee connector at the drivers front brake hose??? I am not exactly sure what the repair person on that job was doing. The rear line was pretty rusted and simply twisted off on attempted removal. I thought on the solution last night before bed and decided this is what I would try. No need to unhook the lines at the frame on the bronco this way. Redo the end of one line and tweak the shape of stock bronco lines. If it didn't work all I would loose is a little bit of my time and I would be ordering brake lines at that point (which I would have had to do anyway). That's simply the logic.

Really nice progress Andrew! Also, I am glad you posted this. Many years elapsed between when I removed the hydroboost equipment and my reinstallation into my F150. I did not pay much attention to the original lines... I just hooked them up the way they came off of the F150 booster (rear master cylinder port connected to the front port on the pressure differential valve, front master cylinder port to the rear of the pressure differential valve). I compared this to the lines in the ‘95 F-Superduty and it appears I have them backwards. The big F does not have a pressure differential valve, but the front master cylinder port has a hard line that goes directly to the front brakes, and the rear master cylinder port goes to a junction block of sorts on the inner frame rail (rear brakes).

So this might explain the tendency for my rear brakes to lock up on the ‘81 F150... although in general I don’t have any complaints on performance. I looked at my ‘89 parts truck and the master cylinder lines are ordered like the bullnose ones (rear master cylinder port goes to the front brakes), and since it does not use a pressure differential valve either, I’m not sure if those hardlines would be of much help (to connect an F-Superduty master cylinder in a Bullnose).

Also, keep you flare tool handy. I had told Gary to get the Chevy Saginaw to hydroboost pressure hose but turns out the fitting is wrong for the Ford Hydroboost body. If that is the new line you bought I’m guessing you will need to change the fitting... sorry... I jumped the gun with my speculation that it might fit.

[ArdWrknTrk]

Really nice progress Andrew! Also, I am glad you posted this. Many years elapsed between when I removed the hydroboost equipment and my reinstallation into my F150. I did not pay much attention to the original lines... I just hooked them up the way they came off of the F150 booster (rear master cylinder port connected to the front port on the pressure differential valve, front master cylinder port to the rear of the pressure differential valve). I compared this to the lines in the ‘95 F-Superduty and it appears I have them backwards. The big F does not have a pressure differential valve, but the front master cylinder port has a hard line that goes directly to the front brakes, and the rear master cylinder port goes to a junction block of sorts on the inner frame rail (rear brakes).

So this might explain the tendency for my rear brakes to lock up on the ‘81 F150... although in general I don’t have any complaints on performance. I looked at my ‘89 parts truck and the master cylinder lines are ordered like the bullnose ones (rear master cylinder port goes to the front brakes), and since it does not use a pressure differential valve either, I’m not sure if those hardlines would be of much help (to connect an F-Superduty master cylinder in a Bullnose).

Also, keep you flare tool handy. I had told Gary to get the Chevy Saginaw to hydroboost pressure hose but turns out the fitting is wrong for the Ford Hydroboost body. If that is the new line you bought I’m guessing you will need to change the fitting... sorry... I jumped the gun with my speculation that it might fit.

Yes Jonathan, the master cylinder ports swapped positions with the change to a plastic reservoir and an aluminum body.

[IDIBronco]

Also, keep you flare tool handy. I had told Gary to get the Chevy Saginaw to hydroboost pressure hose but turns out the fitting is wrong for the Ford Hydroboost body. If that is the new line you bought I’m guessing you will need to change the fitting... sorry... I jumped the gun with my speculation that it might fit.

Interesting. Sounds like that is the first order of business this morning. If it is just moving the nut and adding a flare onto the new line I can live with that. I saved the hydroboost end of the pressure line from the F-Superduty when I got the parts. The pump end was damaged, but I didn't think I needed the line anyway. If that is the case I am glad I held onto the line as I would be able to reuse the flarenut.

I can see swapping parts around how the front and rear brakes could get hooked up backwards. I wonder if you will have better brake performance with the lines swapped to the proper ports.

[IDIBronco]

Also, keep you flare tool handy. I had told Gary to get the Chevy Saginaw to hydroboost pressure hose but turns out the fitting is wrong for the Ford Hydroboost body. If that is the new line you bought I’m guessing you will need to change the fitting... sorry... I jumped the gun with my speculation that it might fit.

Interesting. Sounds like that is the first order of business this morning. If it is just moving the nut and adding a flare onto the new line I can live with that. I saved the hydroboost end of the pressure line from the F-Superduty when I got the parts. The pump end was damaged, but I didn't think I needed the line anyway. If that is the case I am glad I held onto the line as I would be able to reuse the flarenut.

I can see swapping parts around how the front and rear brakes could get hooked up backwards. I wonder if you will have better brake performance with the lines swapped to the proper ports.

Not sure it is visible in the picture, but there is a slight difference in the threads between the new Delco (GM) hydroboost hose and the factory ford. They are very close to the "same" when held against one another to check the pitch of the threads. So I took a walk over to the shop for a bit more accurate readings.

That is the O.D. of the ford thread.

O.D. of the Delco thread.

So the Delco is .020 larger, not the end of the world considering the threads in the hydroboost feel a bit oversized. So I said to myself... "This might work".

Now to check the threads.

The ford is definitly a 18tpi thread. I also quickly learned trying to capture the measurement was exceedingly difficult.

The Delco end has "almost" 18tpi. I do not have a metric thread gauge set, but I imagine it is a very close metric thread. It is hard to see, but the very last thread is just really starting to work out of the base of the thread.

Definitely not good.

At that point I walked back out of the shop to head to the bronco to work, and the nice sunny sky was still there, but the dark clouds in the distance where a lot closer than I had anticipated. I misjudged how much time I had before rain started. So it quickly turned into a mad dash to get the tools back safely inside of the bronco, the window up, and any random parts back under cover. I lost the race and ended up soaked. The rain lasted about 30 seconds longer than it took me to get in the house. It stopped raining just long enough for me to get motivated enough to start heading back outside and then the real rain started.

So now it is back to researching what I need to get ordered yet.

[Gary Lewis]

Not sure it is visible in the picture, but there is a slight difference in the threads between the new Delco (GM) hydroboost hose and the factory ford. They are very close to the "same" when held against one another to check the pitch of the threads. So I took a walk over to the shop for a bit more accurate readings.

That is the O.D. of the ford thread.

O.D. of the Delco thread.

So the Delco is .020 larger, not the end of the world considering the threads in the hydroboost feel a bit oversized. So I said to myself... "This might work".

Now to check the threads.

The ford is definitly a 18tpi thread. I also quickly learned trying to capture the measurement was exceedingly difficult.

The Delco end has "almost" 18tpi. I do not have a metric thread gauge set, but I imagine it is a very close metric thread. It is hard to see, but the very last thread is just really starting to work out of the base of the thread.

Definitely not good.

At that point I walked back out of the shop to head to the bronco to work, and the nice sunny sky was still there, but the dark clouds in the distance where a lot closer than I had anticipated. I misjudged how much time I had before rain started. So it quickly turned into a mad dash to get the tools back safely inside of the bronco, the window up, and any random parts back under cover. I lost the race and ended up soaked. The rain lasted about 30 seconds longer than it took me to get in the house. It stopped raining just long enough for me to get motivated enough to start heading back outside and then the real rain started.

So now it is back to researching what I need to get ordered yet.

You might be interested in this comment in the Hydroboost Planning thread: "But the Chevy hose, #366630, doesn't fit. The fitting for the hydroboost end is metric, with a 1.5mm pitch and a .700" OD while the one that came off the hydroboost has an 18 tpi pitch and measure .680" OD."

[IDIBronco]

You might be interested in this comment in the Hydroboost Planning thread: "But the Chevy hose, #366630, doesn't fit. The fitting for the hydroboost end is metric, with a 1.5mm pitch and a .700" OD while the one that came off the hydroboost has an 18 tpi pitch and measure .680" OD."

Yep, I think I have had this hose since about a week after I had done the Saginaw swap. I hadn't seen that it hadn't worked for you. Jonathan recommended this to me at about the time of the Saginaw swap when we emailing back and forth. It has been laying in the shop for quite a while. I am trying to decide what I want to do now. At this point I am considering turning a thread out of some good steel on the lathe to turn onto the Delco hose end to make the thread what I need. It is so close to correct it doesn't need to be that robust to cut the threads. Like a made to order thread die. I have to look if any of my "adjustable" dies have 18tpi jaws, that may be the ticket... Back to the shop. If it weren't a hour round trip to run to a place to have something made i would consider it, but I think I can make this work yet.