brakes???? work ,,,,,,,,,but dont
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FTE Chapter Leader
Joined: May 2001
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From: Rhode Island
brakes???? work ,,,,,,,,,but dont
Well I changed my front pads and rear shoes, and had both the rotors adn drums turned... And it has made a big difference with the stopping of the truck. However, for the first 5 minutes or so of driving the truck ,, the pedal seems wrong?? you can push it with all you might ,, and the brakes wont lock up... When i start the truck , if you put it in gear and try to stop the truck , she just keeps moving , like the brakes were bad or something???
I did notice that the booster had rusted just under the master? And when I shut the truck off you can hear a loud vacume leak or so I think?????would the booster leaking air,, cause the brakes to fail in this manner,,
the truck stops good,(better than no brakes like before) but i would like it to stop the way it should !!!!!!
anyone ???
I did notice that the booster had rusted just under the master? And when I shut the truck off you can hear a loud vacume leak or so I think?????would the booster leaking air,, cause the brakes to fail in this manner,,
the truck stops good,(better than no brakes like before) but i would like it to stop the way it should !!!!!!
anyone ???
New User
Joined: Mar 2001
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brakes???? work ,,,,,,,,,but dont
just had my 85 done today...was doing the same thing you describe, but on mine I could hear a hissing anytime I applied the brakes, so I took it in for a new booster.....turns out the master cylinder was cracked, which probably leaked into the booster and ruined it. I was wondering why on cold mornings I had little or no brakes....had never had the booster do that before, so now I guess I know.
Senior User
Joined: Oct 2001
Posts: 165
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From: Juneau, AK
brakes???? work ,,,,,,,,,but dont
i had same symptoms on my previous '84 f250. the booster would leak down while the truck was sitting, sounds like a leak from the booster to me. check the little valve that heads off to the back of the carb.
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'86 F-250 w/460
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'86 F-250 w/460
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FTE Chapter Leader
Joined: May 2001
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From: Rhode Island
brakes???? work ,,,,,,,,,but dont
I can hear the vacume leak, and it seems to be coming from the booster it self. But I cant determine where it is actually coming from ? If I were to spay some ether or something at the master, would the motor rev up , showing where the vacume leak is coming from?
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Senior User
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brakes???? work ,,,,,,,,,but dont
First check the hose going to the booster. A neat trick I found was to disconnect the hose from the engine, light a smoke & blow the smoke into the hose. Any smoke coming out will be the vacuum leak.
Next hook the hose back up & start the truck. In park step on the brakes. If you hear a hissing while inside the cab, buy a vacuum booster. If no hissing then you may have air in the system. How does the brakes work in the rain? Does 1 rear wheel grab? If so the rear cylinders are going (happened to me so I thiught I would throw it in)
Good Luck
Walter
Next hook the hose back up & start the truck. In park step on the brakes. If you hear a hissing while inside the cab, buy a vacuum booster. If no hissing then you may have air in the system. How does the brakes work in the rain? Does 1 rear wheel grab? If so the rear cylinders are going (happened to me so I thiught I would throw it in)
Good Luck
Walter
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Joined: Jan 2001
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From: Virginia
brakes???? work ,,,,,,,,,but dont
I had the booster go bad on my truck, and went to the junkyard to get one. The guy who owned the junkyard said he wished he had a truck load of these boosters for Ford pickups because everybody comes by wanting one. Needless to say he didn't have one, but after I found that out I suppose it was a good thing I had to buy a new one. I recommend you get one with the master cylinder already mounted on it.
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FTE Chapter Leader
Joined: May 2001
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From: Rhode Island
brakes???? work ,,,,,,,,,but dont
WELL I JUST HAPPEN TO HAVE ANOTHER BOOSTER\MASTER ASSEMBLY IN THE GARAGE, ILL HAVE TO CHANGE IT OUT.
UNDER THE MASTER IS RUSTED. SO IM GOING TO IMAGINE THAT THE BOOSTER IS SHOT...
THE OTHER ONE I HAVE IS LIKE NEW ,, SO IT SHOULD SOLVE MY PROBLEM,,,HOPEFULLY !!!!
THANKS FOR THE HELP GUYS,, ILL KEEP YOU UPDATED,,,,,
UNDER THE MASTER IS RUSTED. SO IM GOING TO IMAGINE THAT THE BOOSTER IS SHOT...
THE OTHER ONE I HAVE IS LIKE NEW ,, SO IT SHOULD SOLVE MY PROBLEM,,,HOPEFULLY !!!!
THANKS FOR THE HELP GUYS,, ILL KEEP YOU UPDATED,,,,,
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FTE Chapter Leader
Joined: May 2001
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From: Rhode Island
brakes???? work ,,,,,,,,,but dont
Well I changed out the booster\master assembly,,as well as the lines to the proporting valve, and a surprise hard line that deceided to burst on the bleeding out process...
The truck stops so much better,, HOWEVER it still seems spongy,, I still cant seem to lock up the brakes, I mean ,, I know my truck isnt going to stop on a dime,,,,,but ,, my 75 with drum on drum ,, stoped so much better,, and without a spongy pedel.....
Any Ideas,,
The truck stops so much better,, HOWEVER it still seems spongy,, I still cant seem to lock up the brakes, I mean ,, I know my truck isnt going to stop on a dime,,,,,but ,, my 75 with drum on drum ,, stoped so much better,, and without a spongy pedel.....
Any Ideas,,
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From: Durham
brakes???? work ,,,,,,,,,but dont
Yeah, I just spent an arm and a leg on a brake job (rear drums only) and mine still doesn't feel right and I have the same issue, can't seem to lock the brakes. If your brakes are spongy, you either have air in the line or one or more of the rubber brake hoses is weak. You can test the hoses by having someone depress the brakes while you watch the hose. If it's weak, you will actually see the hose swell. Or, you can use a pinch off plier on the rubber hose and if it stiffens up your brake pedal, you know the problem is in that hose or brake cylinder.
If you have air in the line, re-bleed the brakes starting with the furtherst from the master cylinder and working to the closest wheel to the master cylinder. Oh, if you have bad (burned or old) brake fluid that could cause sponginess also.
Hope that helps,
Slik
If you have air in the line, re-bleed the brakes starting with the furtherst from the master cylinder and working to the closest wheel to the master cylinder. Oh, if you have bad (burned or old) brake fluid that could cause sponginess also.
Hope that helps,
Slik
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From: Virginia
brakes???? work ,,,,,,,,,but dont
I've had a spongy brake pedal right after I got the drums turned, and come to find out, they turned the drums too thin and they where flexing, giving a soft pedal. As with the other tests, you cam also get under the truck while somebody presses the brake and feel the drums flexing under pressure. There is a spec somewhere on how much material you can remove off the drums. Sometimes it's stamped on the drum.
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FTE Chapter Leader
Joined: May 2001
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From: Rhode Island
brakes???? work ,,,,,,,,,but dont
well I will have to look at the brake hoses,,, as far as the drums franklin,, When I had the rotors and the drums turned ,, the guy at the machine shop said they had never been turned before by the measurement he took off the drums and the rotors... so the previous owner must have changed the brakes some time before the truck sat,,, before it got it ,, so it cant be the drums flexing,,,
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brakes???? work ,,,,,,,,,but dont
[updated:LAST EDITED ON 21-Nov-01 AT 07:49 PM (EST)]A bleed of the system might be in order. Start at the rear passanger, rear driver, front passanger, front driver. If that does not fix those mussy brakes, then check the hoses. But a bleed never hurts. just make sure the WD-40 is sprayed on the bleed valve before turning it. Sucks to break them off.
Happy T-Day
Walter
Happy T-Day
Walter
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