78 F150 brake problem
Thread Starter
|
New User
Joined: Sep 2003
Posts: 4
Likes: 0
78 F150 brake problem
It all started when my buddy drove a couple of miles with my e brake on. After that my front right caliper piston cracked in half and the back did nothing to slow me down. I have since then replaced both rear wheel cylinders, shoes and all springs and hardware and on the front I replaced both calipers, shoes, and lines. I also replaced the master cylinder. Now when we try to bleed them while starting at the right rear we have pressure and all fluid comes out then out off the blue air comes out and sometimes nothing. The pedal don't even get hard. does this sound like a booster problem or maybe a line on the rear? Also I am about to lift the suspension 6 inches and I was wondering what kinda brake line I would need to accomidate for the lift. Thanks
Junior User
Joined: Aug 2003
Posts: 77
Likes: 0
From: Denmark, WI
78 F150 brake problem
If you are all of a sudden getting nothing that could be a sticky valve in the master cylinder. Are your rear brakes adjusted properly,cuz if not that could cause the master to travel further than it is supposed to and stick a valve. Did you bench bleed the master? I will try to watch this thread and help you as much as I can.
Posting Guru
Joined: May 2002
Posts: 1,300
Likes: 0
From: Southwestern Michigan
78 F150 brake problem
Are the calipers on the correct side? The bleeder screw needs to be at the top of the caliper........I had a brain fart earlier this year and did that on my 98.
Senior User
Joined: Aug 2003
Posts: 394
Likes: 0
78 F150 brake problem
i'd double check the bench bleed on the master. also it sometimes helped me to open the valve have buddy put it to the floor the close n have him let up, trying this a few times to get the stuff moving. once u get it moving in all wheels then you can get all the air out going around the truck a few times. i am gussing there is still just too much air to pump it up , i am not sure how the proportioning valve plays into this, doubt it does but it is there for anyone to have an opinion on
New User
Joined: Jan 2008
Posts: 0
Likes: 24
78 F150 brake problem
Put the M/C in the vise.
Attach the plastic couplers that come with the M/C to the M/C and then the two clear plastic tubes.
Get a container that you can see through & put about 1 1/2" of brake fluid in it.
Now put the tubes into the container
Now put a lot of Brake Fluid in the master cylinder
Now use a 12" 3/8" extension and very smoothly >push the slave cylinder in ....let it out ....push it in ......let it out to simulate putting the brakes on untill there aren't any more bubbles going into the container.
Top the M/C Put the lid on and you're ready to mount the M/C.
Attach the plastic couplers that come with the M/C to the M/C and then the two clear plastic tubes.
Get a container that you can see through & put about 1 1/2" of brake fluid in it.
Now put the tubes into the container
Now put a lot of Brake Fluid in the master cylinder
Now use a 12" 3/8" extension and very smoothly >push the slave cylinder in ....let it out ....push it in ......let it out to simulate putting the brakes on untill there aren't any more bubbles going into the container.
Top the M/C Put the lid on and you're ready to mount the M/C.
Trending Topics
Logistics Pro
Joined: May 2003
Posts: 4,238
Likes: 21
From: Northern Illinois
78 F150 brake problem
i mount the master on the vehicle and use the foot pedal to "bench" bleed it, i also run the tubes right back into the master reservoir. the key trick is to not let the master run out of fluid when bench bleeding, it will suck air and you are back at step 1
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Senior User
Joined: Aug 2003
Posts: 394
Likes: 0
78 F150 brake problem
sounds like the master is your problem if u never bench bled it..lol.
i tried doing it on the truck before and it does work but i found i had better luck just putting it in a vice that way you can go til all the bubbles are out n u can see what you r doing and it is perfectly level, but on the truck works too, if u lost the plastic nozzles n tubes the parts store should carry the kit with instructions
i tried doing it on the truck before and it does work but i found i had better luck just putting it in a vice that way you can go til all the bubbles are out n u can see what you r doing and it is perfectly level, but on the truck works too, if u lost the plastic nozzles n tubes the parts store should carry the kit with instructions