Brakes not working!!!
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Junior User
Joined: Jul 2005
Posts: 74
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Brakes not working!!!
Alright this has been really making me mad so i need yalls help. I have 1996 f-150 with a 1978 F-150 front end. The calipers are from the 78, but the rotors, extended brake lines, and master cylinder are from the 96. after the swap i bled the system over and over myself and then i would get pressure in the pedal, but after about 10 seconds it was gone. So i took it to a local 4WD place called Extreme 4WD and asked them to check it out. they told me they got all the air out of the system and replaced 2 lines but were still having the same problem as me, the brakes wouldnt hold pressure. The master cylinder in new(rebuilt) so i dont thinks its that. So to anyone who has done a SAS or anyone who knows brakes, help me please!!!! I know brakes arent that complicated but im really getting frustrated. Could the different years of lines and calipers be the problem or maybe the 96 master cylinder isnt designed for those 78 calipers. I dont know. Mayb u guys could tell me what you did when you did your SAS. So any suggestions would really help.
Thanks,
Will
Thanks,
Will
Cargo Master
Joined: Sep 2005
Posts: 2,954
Likes: 64
you need to be more specific with the actual symproms.
when you bleed them you get brakes, then what happens?
after you've lost them can you pump them up or are they gone for good.
at that point can you rebleed them and get them back?
when you bleed them you get brakes, then what happens?
after you've lost them can you pump them up or are they gone for good.
at that point can you rebleed them and get them back?
Postmaster
Joined: Oct 2004
Posts: 4,155
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From: Southern Louisiana
Do you hear any loud vacuum type noises when you depress the brake pedal? If not, I would take another hard look at that master cylinder, return it if need be and get another one and try it before totally writing it off. It is a rare occurance, but it is possible to buy defective parts, and the problem you describe certainly does merit a second look at the master cylinder. If it does hiss and make a loud vacuum noise, that check on replacing your vacuum booster.
Elder User
Joined: Feb 2006
Posts: 691
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From: Eau Claire, WI
I cant help you, I dont know much about brakes (other then my back ones dont work, and im really effing pissed)
I'm wandering why you put 79 parts on a 96, unless i read that backwards
We had a problem with the ones on the truck. We got to take a 95 cougar to the cabin vs the 82 f150 for a week (had to park on the main road, couldnt do much else with it)
Came back a week later, and it blead just fine... Magical brake faries? Dont know, but let it sit, might move the air out by itself (sit the MC resivour cap on it. dont tighten it down)
Good luck
~Nate
I'm wandering why you put 79 parts on a 96, unless i read that backwards
We had a problem with the ones on the truck. We got to take a 95 cougar to the cabin vs the 82 f150 for a week (had to park on the main road, couldnt do much else with it)
Came back a week later, and it blead just fine... Magical brake faries? Dont know, but let it sit, might move the air out by itself (sit the MC resivour cap on it. dont tighten it down)
Good luck
~Nate
Thread Starter
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Junior User
Joined: Jul 2005
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alright ive dun a little bit more research so tell me what yall think of this. the front end is off a 78 but the truck is a 96. I re used the 96 rotors durring the swap. On a 1978 f-150 the minimum thickness that the rotor can be is 1.12 in. On a 1996 f-150 the original thickness of a new rotor is 1.16 in. So with that info it would seem like these rotors would be fine but ive had the truck almost three years and ive never replaced the rotors. So i can assume theyve worn atleast .04 in. this would put the thickness of my rotors below the minimum requirement. I think that would be the reason i dont retain pressure, bc the piston in the caliper is fully extended and its not meeting with anything. that really is the only thing i can think off so does that make sense to yall or am i wrong?
