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another brake question

suntadz

suntadz

1/2 ton status
Joined
May 15, 2005
Posts
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Location
bay area, ca
i know ive ben searching but i need to goto bed now and havent found that magical thread yet.
I just did a 14ff swap to my truck. hooked up the the new 13" drums and worked great. drove it a couple weeks. then got around to the 8 lug front conversion. Got it running today and have no pedal. bleed brake till im blue in the face and still nothing. They work but barley after the pedal travels to the floor. so im about to go get a new master and new calipers but wasnt sure if they were needed. I reused my 1/2ton calipers and just put in new pads. I see there different parts numbers for 1/2 and 3/4 tons. are my old calipers to small? i did go from 11" to 13" rotors. also i know they also have different part numbers for the master cylinder. i think one had a 1 1/8 bore and the other a 1 1/4 bore. Anyone know if this will help my problem or be a waste of time and money and I still wont have any better pedal? before the swap the pedal was very good. a bit worse after the 14 bolt swap but still good. but now with the 8 lug front conversion there almost gone but i didnt think it would make a difference. any help would be helpful:D .
 
Hmmm. If you reused the front calipers did you disconnect the front brake lines? You shouldn't have to rebleed if you never broke into the lines. FYI- sometimes air can get sucked back into the caliper past the threads on the bleeder. Use some antiseeze on the threads to prevent this- or a power bleeder. The difference in calipers IIRC is that since the 3/4 ton rotors brake surface is a bit taller then the 1/2 tons, the calipers are a bit taller and so are the pads. Swapping out calipers is not gonna solve your problem. Your MC might have taken a dump since you've been bleeding alot. You still running the factory prop valve? Did you let the fluid run completely out of the MC? Maybe it needs to be bench bleed cuz it has air trapped in it. Good luck and let us know what you find out.
 
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I'm in the exact same boat as you. Did the 3/4 ton swap and now the pedal is almost non existent. After bleeding, replacing MC and prop valve with known working ones I got absolutly no where. So what i've been doing for the last 4 or 5 months is pinching off the rear brake line. Pedal is great in fact better than its ever been even before the 3/4 ton swap and the brakes work ok. What I'm going to do now is put an adjustable prop valve in and see if it will help. If that doesn't work I'm going to see if 10 bolt wheel cylinders fit the 14 bolt ff. From my thinking the 1 ton 14bff has huge wheel cylinders (i think the bore is 1 5/16) this would be taking a lot of fluid before the brakes ingage the drums. The smaller cylinders will take less fluid hopefully firming up the pedal and reducing the amount of grab the back brakes have. I don't know if any of this will work and i'd love to do the disk brake conversion but getting the brakets up here is spendy.

I really have no other ideas you can find my thread and look through it. There was lots of good ideas but none of them solved my problem.
 
thanks for the input. Yea I read your thread and nothing seemed to be right for me to go just swapping parts yet. I think even though the rear drums are massive after they get the intial fluid there it dosent take any more to move them than the 10 bolts. I think the hydraulics just take a small amount but works on pressure but not too sure anymore. Im going to go with a bigger master and take it to a brake shop to have them put it in and bleed them.
 
I think the problem is that the seal on the master cylinder piston came off. I know that when I changed the my master cylinder once it happened to me. If the piston gets pushed in too far th seal will come off. Well turn inside out. Before you take it in to get a new one open it up and look. I think it will save you some bucks.
 
still working on it. so far i found that i did fubar up the master cylinder somehow by bleeding it so i got a 3/4 ton master with a bigger bore in it and the lines are reversed so im hooking that up and seing what happens. debating ripping the power booster out too but then there is pedal linkagae issues i havent had time to sort out. olet you now when i finish.
 
well i just replace the master with a 3/4 jb7 one and it does seem better than b4 but not as good as it was. Im leaning now towards the front calipers but gonna call this project quits for now caues its within my tolerence now. Ill out 3/4 calipers on next time im in there.
 
so i broke down and started to adj my rear brakes. wow what a difference. the pedal is right there now feeling real solid. guess it was out of adjustment. I suggest before getting into swapping all the crap i was thinking i should have just adj what i had. Look into the rear drums for better pedal feel. now lets see how long it stays in adjusment.
 
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