Brake Pressure Problems on 1991 Lincoln Continental Executive Series

R

rudymanitou

Registered
I was wondering if anyone could help me with some info. My mechanic has told me that the "PROPORTIONATE VALVE" is leaking like a siv, and that is why our brakes barely work. I have had a very hard time finding the part anywhere. While trying to find it, many Ford Parts people have said that this is a very un-common part to go and that is partially why they stopped making it over 6 years ago. Now my brother in law who is a mechanic with pratt and whitney, seems to think that it is really the master cylinder that is gone. Heres what happens when we try to drive the car. I barely have any brakes and the peddle goes almost right to the floor and the car takes like 10 feet to stop, yet if you pump the brakes in and out fast, several times, they get harder and the brakes work a little better and the car stops faster. Apparently the rear passenger side caliper is gone as well. Can anyone provide any insite into this or what they think. Thanx so much for the help in advance. Take care.

Jamie
 
RE: Brake Pressure Problems on 1991 Lincoln Continental Executive Series

Do you have any leaks?

How did this come about?

[div class="dcquote"][strong]Quote[/strong]
I barely have any brakes and the peddle goes almost right to the floor and the car takes like 10 feet to stop, yet if you pump the brakes in and out fast, several times, they get harder and the brakes work a little better and the car stops faster. [/div]

Sounds like the master cylinder is bad, air in the lines or a massive leak.
 
RE: Brake Pressure Problems on 1991 Lincoln Continental Executive Series

the car worked perfectly fine one day and then the next day after my wife dropped me at work, the brakes went on her when she was half way to work. the mechanic says the proportioning valve is leaking, and the rear passenger caliper is gone. I know there is a leak as when the problem arose i was able to put a bottle and a half of brake fluid in the master cylinder reservoir.

A bunch of different Ford people have told me that they doubt it was the proportioning valve as it is a very uncommon part to go. When you drive the car now the peddle goes right to the floor and the car takes 10 or 15 feet to stop, but if you pump the brakes fast you get better brake pressure and the car stops better, and you have you to keep pumping the brakes each time you want to try and stop the car.

The reason im question that this is the problem is because when you look at the valve its two solid units with brake line nuts screwed into it so tight you cant even budge them now, so where could it leak from. That is why ford said it seemed very uncommon, and they stopped making this part like 6 years ago. Any help would be appreciated. if you look in the same thread this message is in there is a picture of the proportioning valve when i posted asking about it.

Thanx Jamie
 
RE: Brake Pressure Problems on 1991 Lincoln Continental Executive Series

[div class="dcquote"][strong]Quote[/strong]
... I know there is a leak as when the problem arose i was able to put a bottle and a half of brake fluid in the master cylinder reservoir. [/div]

First, locate the leak. Perhaps the caliper?

After solving that, then bleed the system.
 
RE: Brake Pressure Problems on 1991 Lincoln Continental Executive Series

thanx for the help it is much appreciated. So you dont think it is the Proportioning Valve. That is my main concern, ruling out that part as the cause of the brake problem because that is what the mechanic seems to think it is, yet everybody else has told me that the chances of that being the problem are pretty slim including Ford, and it most likely the master cylinder or the rear caliper, which the mechanic says is gone, and air in the line. One of those things or a combination of them. The car does also pull to the left when you press the brakes down.

Thanx For the help
Jamie
 
RE: Brake Pressure Problems on 1991 Lincoln Continental Executive Series

[div class="dcquote"][strong]Quote[/strong]
... So you dont think it is the Proportioning Valve.
[/div]

Unless it's leaking externally and thus the source of the leak.

It likely pulls to the left because of the passenger side rear caliper.
 
RE: Brake Pressure Problems on 1991 Lincoln Continental Executive Series

I appreciate you taking the time to provide me with some help JP

I guess the biggest question I have is, have you ever heard of anyone having a problem with the Proportioning Valve on a Lincoln Continental or the valve ever leaking.

Ive talked to some pretty experienced mechanics and Ford specialists, they all have said this is a very unlikely part to have a problem with, so that is why I was wondering if you had ever heard of anyone having the same problem, or seen anyone ever post on here about this same sort of thing.

I was also wondering if you knew any good sites on the internet to find quality resources like information and schematic diagrams on Lincoln Continentals from 1990 to 1994.

Any help JP would be greatly appreciated. Take care.

Thanx Jamie
 
RE: Brake Pressure Problems on 1991 Lincoln Continental Executive Series

I had to replace the proportioning valve on my mark 8, but it wasn't leaking, it was clogged.

I would first suspect a caliper leaking, then a master cylinder problem. IIRC, that vintage continental has a wierd brake system, but i'm no expert.

Are you getting brake fluid leaking on the ground?
 
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