Re: Disk Brake conversion mistake?
 

Thanks man, I'll look into it further. Cant wait to get this all done. I'd like to drive it a bit before the summer is over........

Re: Disk Brake conversion mistake?
 

Just a little update on all I'm doing, Started a little late today, and had to stop early, it is 95 degrees in my neck of the woods, and the garage is about 101..... Anyway,.. I got my brake line done, and BTW Tx Firefighter, you were right, there was a union just where you said it would be, guess I was just tired and couldn't find it that day.. Well I decided to put the tires I will be using at least on the rear of the truck and take it off the stands it was sitting on, just to see what it looks like with the frame low... So here come the questions...

In this pic # 1, the frame is low but still too high I think, here is what the tank looks like, Ugly I know.. its coming out and a mustang tank going in... It still had the 2'' blocks, if I remove them will it sit lower?

Pic #2Look at all the space between the axle and the bump stop in the C- notch, that should be sitting on that axle, shouldn't it?

Pic # 3 Here's the other side, you can see the block still there, but I was told there would be no issues leaving the blocks in.... ?

Pic # 4 This is how the bags are sitting in there now, now air in them. They should be compressed more, no?

Am I being to anxious here, Ive yet to sit the front end down, cause I'm still working on the center support... have to cut out the bracket that is sitting in there no longer being used because of the full length drive shaft, but if anyone has any comments on why its not sitting as low as I think it should be, please let me know what else I need to do....

Once again, thanks everyone for your help..... To be continued.....

Re: Disk Brake conversion mistake?
 

#1 & 3) Removing the blocks would cause it to sit even higher.

#2) When aired out, if the dimensions are set-up correctly & nothing is binding, the axle tube will hit the bumpstop. 2 things you need to determine: What bags are those & does anything appear to be binding (is the d-shaft touching the carrier bearing bracket)?

#4) Most dbl convoluted bags compress to 3". There's no weight on the rear end right now so that's part of the issue.

If you want it lower, you might need to discard the upper bag bracket. What ever the height of that is would be how much more drop you can achieve. The appropriate holes would need to be drilled through the frame rail which is more difficult vs. just using the upper bracket.

Re: Disk Brake conversion mistake?
 

No, nothing is binding, and in the pictures, the drive shaft is removed. I'll double check tomorrow, but Ive yet to ad air to the bags to see how the system works and than air it out. Perhaps that may change things.. I don't know as of yet. Hope to get the center fram support done, put all the wheels on and air it up. Right now I have the manual valves hooked to shrader valves to test the system and check for leaks,.. haven't don that yet. I hope things will just settle in. Will see.

Thanks for the input, will follow up.......

Re: Disk Brake conversion mistake?
 

Put some weight back there when the time comes for validating things.

Re: Disk Brake conversion mistake?
 

Yep will do, thanks...............

Re: Disk Brake conversion mistake?
 

Will I got the thing thing to lay flat, I just put the wheels on in the front, took her off the jack stands and low and behold, she be low...... So I decided to start to bleed the brakes, when something hit me I just seem to forget totally.. I am' embarrassed to ask, but I will. I need to get this done... Though I haven't yet attempted to start to bleed the brakes and reading further on the subject. I had the drum set up before the caliper conversion, now the PO told me he added a brake booster and a proportioning valve to the drum set up. I remember having an issue with the rear brakes locking up on me and through the forum I remedied that by adding some washers to the MC mounting bolts pushing it forward. That fixed the brakes locking up.. But my question is , I'm not sure if the MC and booster will work with the caliper conversion. I don't know if anyone can tell me through these pictures if this looks like it might work, and if not, since I used the calipers of a 77 half ton, can I just purchase the booster MC and proportioning valve of the same year and if the booster will mount up with out issue? And if not what will I need to do to mount it correctly. I guess I didn't do all my home work on this one....

This is what I have on there now... it was for the old drum, drum set up...

The next pic is the MC, both reservoirs seem to be of the same size.. shouldn't one be larger than the other on a disk drum setup?..

Re: Disk Brake conversion mistake?
 

That's NOT a disc brake proportioning valve.
That is definitely a drum brake distribution block.
I suspect that is a drum brake master cylinder also.
I would change both.

Re: Disk Brake conversion mistake?
 

I suspected as such. Had to ask. But can I use that booster and just get right MC and valve?

Thankslolife99

Re: Disk Brake conversion mistake?
 

Yes.

Re: Disk Brake conversion mistake?
 

Thank you Kieth, almost getting there.... Sheesh...............

Re: Disk Brake conversion mistake?
 

If it was easy, there would be more custom builds.

Re: Disk Brake conversion mistake?
 

Yea, I hear ya. And trying to get parts locally in my neck of the wood is like pulling teeth. I have to order everything and takes light years to get here........

Re: Disk Brake conversion mistake?
 

Just another update on my ride.. Got all the brakes done, but my brake peddle sets a little too low for my comfort. It took me forever to bleed the brakes. I'm wondering if I have to adjust the booster screw. Is it from the peddle to the booster? I'm thinking it just might be a bit short and not pushing it into the MC...Does that make since? I don't know how much free play that brake peddle should have.... Also I got all my air lines plumbed to my bags, checked and double checked for leaks, had a few leaks near the fittings and had to cut new lines, but that was easy and they seemed OK. So I air it up at a level stance and let it sit a bit to see if there were any leaks. Sure enough My driver side is leaking slowly. I checked every where else... no leaks... So here is my stupid question that I think I already know the answer to, but I'll ask anyway. I fear its leaking at the bag fitting, so I guess I will have to take every thing a part to get to the bag, because you know where that bag is sitting. right? Frustrating to say the least. I checked before I set it up in there, but it leaked after the fact anyway..... So to you all kind folks I ask what to do next... Ive been doing this little project when time allows, its taking me a bit longer that I would have liked but I'm learning and haveing fun in the process....

Thanks all

Re: Disk Brake conversion mistake?
 

I've had to change the length of the pedal pushrod when swapping from drum to disc.

Re: Disk Brake conversion mistake?
 

Are there any after market adjustable pus rods on can purchase for the gm set up?

Re: Disk Brake conversion mistake?
 

I don't know of any specifically. Check CPP or others.

I've done one w/a 72 pushrod & then did my 2nd combining the opposite ends of 2 different OE rods. I cut them to the length I wanted & had them welded by a pro w/a TIG welder. No novice mig welding on this important part....

Re: Disk Brake conversion mistake?
 

I Googled 'chevy truck adjustable brake rod' & saw these among the selections...

http://www.jegs.com/p/Stainless-Stee...24562/10002/-1

Re: Disk Brake conversion mistake?
 

Well fiddling around in the garage yesterday, turns out the booster did have and adjustment screw and on the brake peddle side was another. I didn't need to adjust very much, perhaps a little over 0.100.00 of an inch, seemed to do the trick. I could have left it the way it was after bleeding, but I just wasn't comfortable with the feel of the peddle. Seems to be good now, though Ive yetto do some hard braking with it. Will see...

Thank Scocti, I will save the information, hope it helps others........