need help on brakes
Thread Starter
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Senior User
Joined: Oct 2001
Posts: 118
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From: northern VA
need help on brakes
Hi I have a 1977 F-150, 2 WD, 302 engine, power brakes, 4 speed trans. The problem is the truck has no brake pedal to speek of when you push down on the brake it goes all the way to the floor it will stop you. But to have any kind of pedal you have to pump the pedal a few times to get a ferm feel on the pedal.
I have changed the mater cylinder 4 times and bench bleed it,the two front calipers and the rear wheel cylinder 2 times. I have changed the brake booster and it does hold vacuum.Bleed all the lines several times.new brakes all the way around.
Does any body have any ideas on what is wrong with these brakes? Any body run in to this problem before? Any help would be appreciated.
Thanks Rory
I have changed the mater cylinder 4 times and bench bleed it,the two front calipers and the rear wheel cylinder 2 times. I have changed the brake booster and it does hold vacuum.Bleed all the lines several times.new brakes all the way around.
Does any body have any ideas on what is wrong with these brakes? Any body run in to this problem before? Any help would be appreciated.
Thanks Rory
Thread Starter
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Senior User
Joined: Oct 2001
Posts: 118
Likes: 0
From: northern VA
Yes I have checkeed the hoses to see if thay are leeking and they seem to hold a vacuum over night I dont know how much vacuum there is on the brake booster I have no way of telling.
Any other ideas all help appreciated
Any other ideas all help appreciated
Mountain Pass
Joined: Nov 2007
Posts: 226
Likes: 0
From: Chehalis, WA
Hi I have a 1977 F-150, 2 WD, 302 engine, power brakes, 4 speed trans. The problem is the truck has no brake pedal to speek of when you push down on the brake it goes all the way to the floor it will stop you. But to have any kind of pedal you have to pump the pedal a few times to get a ferm feel on the pedal.
I have changed the mater cylinder 4 times and bench bleed it,the two front calipers and the rear wheel cylinder 2 times. I have changed the brake booster and it does hold vacuum.Bleed all the lines several times.new brakes all the way around.
Does any body have any ideas on what is wrong with these brakes? Any body run in to this problem before? Any help would be appreciated.
Thanks Rory
I have changed the mater cylinder 4 times and bench bleed it,the two front calipers and the rear wheel cylinder 2 times. I have changed the brake booster and it does hold vacuum.Bleed all the lines several times.new brakes all the way around.
Does any body have any ideas on what is wrong with these brakes? Any body run in to this problem before? Any help would be appreciated.
Thanks Rory
Freshman User
Joined: Apr 2008
Posts: 41
Likes: 0
From: Ft. Collins CO
You need to isolate the problem. Put line locks on both brake hoses and also the rear. Now see if you have a firm pedal if no then the problem will be in the upper hydrolics (master, booster, prop valve, etc) If you do have a good firm pedal then remove your locks from each hose one at a time to see which wheel is giving you problems.
Also did you mean that you replaced the master cylinder with 4 different ones?
Tom
Also did you mean that you replaced the master cylinder with 4 different ones?
Tom
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Thread Starter
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Senior User
Joined: Oct 2001
Posts: 118
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From: northern VA
HI Tom yes 4 times all rebuilt cant find a new one yet.
Hi Bart have not tryed that I will in the morning.
Thanks
Also does anybody know how to tell if a porportioning valve is bad?
Thanks for all the input Rory
Hi Bart have not tryed that I will in the morning.
Thanks
Also does anybody know how to tell if a porportioning valve is bad?
Thanks for all the input Rory
Laughing Gas
Joined: Apr 2001
Posts: 868
Likes: 3
From: New Glasgow, Nova Scotia
Did you have the front calipers off?? or just bleed them. They could be stuck and are no longer floating on the mount. If this were so , you will never ever get good pedal because they piston would always be travelling to for before it reaches the rotor surface give you a long pedal stroke. This was more common in chevs but it could be you trouble. Good luck.
Post Fiend
Joined: Dec 2006
Posts: 9,111
Likes: 3
From: Lexington Mo
Compressorguy has allready given you the answer. You're brakes are out of adjustment. You're brakes (Drum Type) are not adjusted out enough. That's why you're pedal gets better when being appied a few times........
Bob
Bob
Thread Starter
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Senior User
Joined: Oct 2001
Posts: 118
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From: northern VA
If the rear brakes are out of ajustment then the e-brake would go all the way to the floor would it not?
Brakmen were do you get a line lock and were would it go on the brake line?
Thanks Rory
Brakmen were do you get a line lock and were would it go on the brake line?
Thanks Rory