1986 ford bronco brake problem
Elder User
Joined: Jan 2008
Posts: 973
Likes: 0
From: Gatineau, Quebec
No need to get your panties in a bunch.
These aren't my comments...they are facts. I cannot explain what happened in your situation, but a bad brake booster should not cause a pedal to go to the floor.....just the opposite.
Google is your friend...don't be afraid to check if you don't believe me.
These aren't my comments...they are facts. I cannot explain what happened in your situation, but a bad brake booster should not cause a pedal to go to the floor.....just the opposite.
Google is your friend...don't be afraid to check if you don't believe me.
Thread Starter
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Mountain Pass
Joined: Jan 2009
Posts: 143
Likes: 1
I have replaced the brake master cylinder. That was the first thing after the wheel cylinders and new brakes and hardware kit. I bled the brakes (all wheels) and the pedal builds up pressure. Then when you start it the pedal falls to the floor when you push it.
It does make a hissing sound when you push the pedal but I didnt think that was anything to worry. Will the hissing sound when you apply the brakes cause any trouble
It does make a hissing sound when you push the pedal but I didnt think that was anything to worry. Will the hissing sound when you apply the brakes cause any trouble
Thread Starter
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Mountain Pass
Joined: Jan 2009
Posts: 143
Likes: 1
I didnt think a bad booster could have caused my problem after reading how the work.
I have read on different sites that you have to bench blead the master cylinder before putting it on, (which makes sense)
and that if not bench bled it could take a long time to blead. Also that some times it wont blead at all.
Is this true.
I have read on different sites that you have to bench blead the master cylinder before putting it on, (which makes sense)
and that if not bench bled it could take a long time to blead. Also that some times it wont blead at all.
Is this true.
Elder User
Joined: Jan 2008
Posts: 973
Likes: 0
From: Gatineau, Quebec
Well, if you did install a MC and did not bench bleed the MC first, then you have some more bleeding to do I suspect.
If you have a new MC and it is not defective and you have no leaks in the system, then you problem is indeed air in the system.
When bleeding your brake system, always start at the wheel that is farthest. so, you would start with the right rear, then left rear, right front and finally left front.
Make sure you keep the reservoir topped up throughout the bleeding process.
If you have a new MC and it is not defective and you have no leaks in the system, then you problem is indeed air in the system.
When bleeding your brake system, always start at the wheel that is farthest. so, you would start with the right rear, then left rear, right front and finally left front.
Make sure you keep the reservoir topped up throughout the bleeding process.
Thread Starter
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Mountain Pass
Joined: Jan 2009
Posts: 143
Likes: 1
Well it is a new Master cylinder, but I cant be sure its not defective. I have bought many new parts from autozone and oriellys that was defective
We didnt bench bled it before installing. So how much air would you say could be in the line.
We didnt bench bled it before installing. So how much air would you say could be in the line.
Elder User
Joined: Jan 2008
Posts: 973
Likes: 0
From: Gatineau, Quebec
Hard to say really....but if you bled all your lines after installing the new MC, you likely have air in all your lines now.bleed in the order I stated and keep bleeding till you see no trace of air. You must have air trapped somewhere...
Thread Starter
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Mountain Pass
Joined: Jan 2009
Posts: 143
Likes: 1
Alright I will try it again and get back with you in a couple of days or so. Thanks for the info.
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Senior User
Joined: Sep 2006
Posts: 282
Likes: 0
From: Broken Arrow
If you didn't bench-bleed the master you will never get all the air out of the system. you can still bench-bleed it with it in the truck. you will need 2 people, one in the truck and one at the MC. the new master should have come with a bleeding kit (2 nipple fittings, some plastic hose, and a holding clip (maybe)). disconnect the brake lines, screw the fittings into the master then run the hose from the fittings into the reservoir, now have one person slowly pump the brakes while the other watches the tubbing for air and adds fluid if needed. when there is no air in the lines pump the brakes 5-6 more times to make sure then remove the fittings and reattach the brake lines. then start the truck bleeding all over again starting at the pass. rear and working up to the driver front. good luck
oh ya one last thing, did the 86 have ABS?
oh ya one last thing, did the 86 have ABS?