Brake problems
Thread Starter
|
Senior User
Joined: Mar 2001
Posts: 296
Likes: 0
From: Maryland
Brake problems
I have restored a 1982 F150 2wd 4.9L,power brakes from the frame up. I have replaced all parts of the brake system except the dist block on the frame , This also includes vac chamber/master cyl. The problem I am having is that after I bleed the system ( I get fluid from all cyl)the pedal remains hard a short period of time an goes to the floor. Also the brake pedal and clutch pedal are not even. I think that I have to short of a rod in the vac chamber. Please help. Thanks Art
Posting Guru
Joined: Jun 1999
Posts: 1,100
Likes: 0
From: Durham
Brake problems
Just because you're getting fluid from all the lines doesn't mean that all the air has been bled out of them. You need to do the routine (start from the fartherst brake from the master cylinder, usually the right rear) run a hose from the bleeder valve to a jar with brake fluid in it. Make sure the hose end is below the fluid level so that it does not suck air back through the hose. Go through several cycles of pumping the brakes up, then hold the brake, open the bleeder valve with the brakes held steady. When the brakes sink to the floor close the valve before he begins to pump the brakes again. You need to do this repeatedly until no air bubbles up through the liquid. Then start on the next brake working around until you get to the closest wheel to the master cylinder.
'82 F150 2WD w/351W (orig 300 I6)
Slik
'82 F150 2WD w/351W (orig 300 I6)
Slik
Thread Starter
|
Senior User
Joined: Mar 2001
Posts: 296
Likes: 0
From: Maryland
Brake problems
Thanks for the quick responce. I started at the right rear,than left/than front. I went through 4 cans of brake fluid. I think that should of got all the air out. Still the same. Thanks Art
Moderator
Joined: Jan 2001
Posts: 56,992
Likes: 2,741
From: Virginia
Brake problems
Did you pull out the rod that sticks out of the power booster and goes to the master cylinder? This will sometimes mess the booster up. Also it has been discussed how the adjustment of this intermediate rod is important, and some parts stores sell the booster and master cylinder already put together and pre-adjusted. There was another thread somewhere, where a guy went and bought this assembly and his problems went away. That's how I did mine and mine works good.
Thread Starter
|
Senior User
Joined: Mar 2001
Posts: 296
Likes: 0
From: Maryland
Brake problems
Well I checked everything. Even went out an bought a vac brake bleeder. When I put the bleeder on the farest wheel cyl, pumped up vac, opened bleed port not a lot of fluid came out. I did this for about 10 min. Then moved to the rear pass side and same thing. Then continued to the front, same thing. Checked master cyl and rebleed. I am thinking now that it is the proportional valve. If this is bad I don't know were to purchase, The Ford dealer laughed when I asked if he had any. No were in MD is one. It is a 1982 F150 2wd 300 cu inch. Please help. Thank Art
Posting Guru
Joined: Jun 1999
Posts: 1,100
Likes: 0
From: Durham
Brake problems
It still, somehow, seems to act like air in the line. I know the master cylinder also has a bleeder valve. If you replaced everything, maybe this needs to be bled also. Another shot in the dark is to make sure that your rear drums are adjusted correctly. Unplug the adjuster and adjust until they just start to drag. Then back up and apply the brakes several times. Be careful, if you still don't have brakes, you might not stop too quickly!!
'82 F150 2WD w/351W (orig 300 I6)
Slik
'82 F150 2WD w/351W (orig 300 I6)
Slik
Trending Topics
Thread Starter
|
Senior User
Joined: Mar 2001
Posts: 296
Likes: 0
From: Maryland
Brake problems
Getting ready to set fire to the truck!!! Last night I rigged up a vacum system using the vacum port from the engine and a sealed container. I hooked up the unit to the backpass side wheel cyl opened the fitting and a little air bleed out and min amount of fluid. I had the same reaction with the front wheels. It seems that something is plugged. I am pointing towards the propotional valve. Everthing is new in the system except this, I hope it is not bad. The propotioanal valve in not avail from any source. I will remove tonight and check. Anyone have any other sugestions? Thanks Art
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
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
Posting Guru
Joined: Jan 2001
Posts: 1,101
Likes: 2
From: Poway, CA
Brake problems
well, i don't know if this'll help, but i had the same problem on my 1971 f100. if i'm not mistaken, your year still has the old all metal master cylinder with the lid that has to have the retaining bar moved, right? if it is, take a real close look at that rubber seal. mine had the tiniest little pin leak, but that turned out to be the culprit.
Thread Starter
|
Senior User
Joined: Mar 2001
Posts: 296
Likes: 0
From: Maryland
Brake problems
Sorry for the long message. I am going crazy !!!I spent all day yesterday tring to troubleshoot the system.
Here what I did.
No air in the lines. verfied with vacume pump and manual bleeding went through 3 containers of fluid.
Adjusted rear brakes(shoes) so the would not even turn.
Jacked front end up, spun wheel depressed brake and verfied that wheel would stop turning when depressing brake.
Removed Proportional valve blew air and all ports and all clear and rebleed system.
Removed line from master cyl used bleeding hose that came with cyl. I verfied that fluid would pump out when depressing pedal with the eng running and not running.
Here is what I got.
I pump pedal up with eng off, the pedal is firm I release redepress pedal,pedal goes to the floor.
I pump up pedal fold down start eng, right to floor.
Two things I noticed.
1. Pedal does not match height of clutch pedal. I ordered a new booster compared lenght of rod to pedal both same.
2. When Pumping up brake pedal 3/4 of fluid from leaves the master cyl. After I release pedal all fluid returns. Is this correct?
I can think of anything else to do. Thanks Art
Here what I did.
No air in the lines. verfied with vacume pump and manual bleeding went through 3 containers of fluid.
Adjusted rear brakes(shoes) so the would not even turn.
Jacked front end up, spun wheel depressed brake and verfied that wheel would stop turning when depressing brake.
Removed Proportional valve blew air and all ports and all clear and rebleed system.
Removed line from master cyl used bleeding hose that came with cyl. I verfied that fluid would pump out when depressing pedal with the eng running and not running.
Here is what I got.
I pump pedal up with eng off, the pedal is firm I release redepress pedal,pedal goes to the floor.
I pump up pedal fold down start eng, right to floor.
Two things I noticed.
1. Pedal does not match height of clutch pedal. I ordered a new booster compared lenght of rod to pedal both same.
2. When Pumping up brake pedal 3/4 of fluid from leaves the master cyl. After I release pedal all fluid returns. Is this correct?
I can think of anything else to do. Thanks Art
Elder User
Joined: Jun 1999
Posts: 861
Likes: 0
From: SE PA
Brake problems
Feel your fustration! Only other thing I can think of is that the master is leaking internally between the front and rear-took a while for me to think of this, but did have it happen once many, many years ago on a friends truck, earlier year though-in a '78. And that was a brand new (rebuilt?) cylinder out of the box which was bench bled before installed. Might be worth a shot at this point in time. He got a another "new" and the problem disappeared. Seemed to recall the same symtoms, worked ok until we needed the braking power for actually stopping, seemed to work under "low" load like when bleeding the 3 or 4 qts. (I think we used more than that!) thru the system. This was on a power brake system also. Just an after thought, if you have the type of prop. valve that has the little stem sticking out of it, make sure it's seating back into the valve, don't think this would be a problem, but can't think of anything else.
Thread Starter
|
Senior User
Joined: Mar 2001
Posts: 296
Likes: 0
From: Maryland
Brake problems
Thanks for the reply. I returned the master cyl thinking that it was leaking also. Still no fix. I was talking to one of my friends, we concluded that I might of put the front calpers on reversed . I mentioned that the bleed fiting was on the bottom and he said that it should be on the top. Is the calpers interchange able with right and left? If this is the problem I feel real stupid.I will check tonight. Thanks Art
Thread Starter
|
Senior User
Joined: Mar 2001
Posts: 296
Likes: 0
From: Maryland
Brake problems
This has been going on for a long time now. GUESS WHT I FOUND! I did have the front calipers reversed. The can fit on either side I reversed them and have a hard prdal now with perfect brakes. Thanks for the support. Art
Thread
Thread Starter
Forum
Replies
Last Post
wr310rdr
1987 - 1996 F150 & Larger F-Series Trucks
6
Jun 12, 2013 04:50 AM