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04-16-2008, 06:44 AM
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#1 (permalink)
| | Senior Member
Join Date: Apr 2008 Location: Central Ohio, USA, Planet Earth
Posts: 151
|  85 LX power brakes booster
Having some serious pedal fade in my one owner rust pile on wheels (85 LX coupe, 302 5 speed).
During the recent cold weather I had no pedal sometimes, decent pedal at others. Heard a lot of air coming out from near the brake pedal's location and figured there is a vent located in that area.
But here is my question: How does the power boster develop "power"? I can find no vaccum hose or fittings running between the engine and the boster housing. (The shop manuals do indicate the 4 and 6 cylinder cars had a line between the block and boster but not the 8).
I'd like to figure this out before taking the time to change the master cylinder. | 
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04-16-2008, 08:36 AM
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#2 (permalink)
| | Super Moderator
Join Date: Dec 2006 Location: Brookfield, Wisconsin
Posts: 1,786
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Sounds like a bad Mastercylinder.
See if you still have the fade with the engine off. Pump up the brakes and see if the pedal stays hard or goes to the floor, if it goes to the floor you have a bad Mastercylinder.
There should be a fat vacuum hose that goes to the Power Booster.
__________________
Mark V
1998 Explorer 4.0 SOHC
1998 Windstar GL 3.8
2001 Corvette Coupe 6 Speed
2006 Honda Shadow Spirit 750 http://public.fotki.com/snextime/
I don't get it why people always expect a old vehicle that breaks down to always be covered under some warranty? If your exhaust tip is larger than your cylinder bore, then you are a Ricer.
You are as useful as a Screen Door on a Submarine! | |
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04-17-2008, 06:53 AM
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#3 (permalink)
| | Senior Member
Join Date: Apr 2008 Location: Central Ohio, USA, Planet Earth
Posts: 151
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Figured that but wanted a second opinion. And, yes, there SHOULD be a vacuum hose but this car doesn't have a place to attach one when seen (and felt with hands) through the hood opening. Maybe it is routed through the firewall and attaches inside the car?
New fangle cars, give me a 1960's Falcon to work on anyday, LOL!
Thanks | |
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04-17-2008, 07:13 AM
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#4 (permalink)
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Join Date: Sep 2007 Location: central illinois
Posts: 1,706
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No, it goes to a source of manifold vacuum. Check around your intake manifold.
__________________
93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
Get ready for the 351 boss build this summer, 4v closed chamber heads, 2.25/1.75 valves, .750 lift, 12.5:1 piistons, wieand tunnel ram, nitrous, I think its gonna roar!
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04-17-2008, 07:19 AM
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#5 (permalink)
| | Super Moderator
Join Date: Dec 2006 Location: Brookfield, Wisconsin
Posts: 1,786
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He says he cant find any hose connection on the brake booster.
__________________
Mark V
1998 Explorer 4.0 SOHC
1998 Windstar GL 3.8
2001 Corvette Coupe 6 Speed
2006 Honda Shadow Spirit 750 http://public.fotki.com/snextime/
I don't get it why people always expect a old vehicle that breaks down to always be covered under some warranty? If your exhaust tip is larger than your cylinder bore, then you are a Ricer.
You are as useful as a Screen Door on a Submarine! | |
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04-18-2008, 07:05 AM
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#6 (permalink)
| | Senior Member
Join Date: Apr 2008 Location: Central Ohio, USA, Planet Earth
Posts: 151
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Oops!
Chalk it up to old age and not seeing what I thought I should see vs what is there.
Yep, right there on the front of the boster is a 90 degree fitting with a thick hose that runs along the firewall to a vacuum manifold. I wanted to see a thick hose coming off the side of the boster and running directly to the top of the engine.
I've decided "it is time" and have signed up for a 23 year old "seeing eye" redhead. (Come to think of it if I had done that earlier I'd have kids by now that could work on the car for me. LOL!) | |
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04-18-2008, 07:07 AM
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#7 (permalink)
| | Moderator
Join Date: Sep 2007 Location: central illinois
Posts: 1,706
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wait 23 year old red head, dang man, where would I get one?
__________________
93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
Get ready for the 351 boss build this summer, 4v closed chamber heads, 2.25/1.75 valves, .750 lift, 12.5:1 piistons, wieand tunnel ram, nitrous, I think its gonna roar!
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04-19-2008, 06:55 AM
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#8 (permalink)
| | Senior Member
Join Date: Apr 2008 Location: Central Ohio, USA, Planet Earth
Posts: 151
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Go to the Ford Service counter and have them check in the catalog under... hummm, what did I do with that part number? | |
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05-14-2008, 08:25 AM
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#9 (permalink)
| | Senior Member
Join Date: Apr 2008 Location: Central Ohio, USA, Planet Earth
Posts: 151
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Had to send her back, they sent me an import from Norway, I asked for domestic. Hard to get replacement parts for imports...
Finally stopped raining long enough to change the master cylinder, what a difference. | |
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