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EFV-8 Club Forum / General Mercury Discussion / 47 brakes not stopping

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Posted By Discussion Topic: 47 brakes not stopping

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bobb
11-22-2023 @ 7:26 AM
Member
Posts: 12
Joined: Oct 2023
          
I cannot lock up brakes to come to a stop. I recently installed new master cylinder (bench bled), new wheel cylinders, new hoses. I both vacuum and pedal-bled brakes. I set adjusters just before drag. When coming to a stop I coast to a stop no matter how hard I stand on pedal. if something happened unexpectedly in front of me, I would hit it. I've re-bled brakes 3 times, no air or leaks. 1947 Mercury Coupe Sedan. Drums front and rear. I have no e-brakes hooked up. I'm obtaining all e- brake parts that were missing from my rear wheels when I purchased car. I fail to see how the e-brake issue could contribute to the problem???? Any suggestions would be appreciated. Bob

ps. I have driven old cars most of my life (82) and am use to none power brakes.


carcrazy
11-22-2023 @ 12:40 PM
Senior
Posts: 1587
Joined: Oct 2009
          
One way to adjust the brakes to get them to stop the car securely is to perform the following steps:
1. Adjust the brakes so they totally lock up the drum to where you can't turn it at all when pulling on the wheel with all your might using your hands
2. Loosen up the adjusters to where the brakes still have just a little drag
3. Make sure all of the brakes have about the same amount of drag so the car doesn't pull to either side when the brakes are applied.
4. Test drive the vehicle to make sure you have a high pedal and and that each brake is providing an even amount of the braking.

trjford8
11-25-2023 @ 8:35 AM
Senior
Posts: 4202
Joined: Oct 2009
          
Since you put in a new master cylinder did you adjust the push rod from the pedal to the master cylinder?

37RAGTOPMAN
11-25-2023 @ 12:27 PM
Senior
Posts: 1941
Joined: Oct 2009
          

did you use moulded rivit on brake lining or glued on brake lining,
are the metal shoes original FORD ? or Aftermarket ?
where did you get them, did you compare them to the ones you took off ? EXACTLY THE SAME SIZE ?
the have to , for the brakes to work correctly, [FULL CONTACT WITH THE DRUMS ]
some of the after market shoes do not give you a high pedal, are not the right size, this is what I have heard,
also disconnect your hand brake cables and adjust the rear brakes, then attach your hand brake cables,
if you have to adjust them, then they were out of ajustment, and were the rear brakes had no FULL CONTACT with the drums,
you say you have new drums, were did you get them. they might have a coating on them to prevent rust,
did you clean them with brake cleaner before using, them,?
hope this helps 37Ragtopman, MAINE

bobb
11-26-2023 @ 10:04 AM
Member
Posts: 12
Joined: Oct 2023
          
37ragtopman....

I mis-led you when I said "Drums both front and rear" I was clarifying that I do not have disc on front. I did not change out shoes nor drums.
The riveted existing shoes all had rivets that were about .100 recessed. and all rivets were uniform. Linings were within .o10 top to bottom.
This all led me to believe shoes were riding properly within drums.
I have car up on rack now and i'm gonna take above mentioned suggestions to adjust my master cylinder push rod and also re-adjust my brakes allowing drag. I had adjusted them with no drag.
Thank you all for the advise and suggestions. Bob

TomO
11-28-2023 @ 6:54 AM
Senior
Posts: 7243
Joined: Oct 2009
          
Bobb, Is your brake pedal hard? How much travel do you have before the pedal stops moving? Did you have thi problem before you replaced the parts?

The answers to these questions will hel us diagnose your problem.

Tom

carcrazy
12-02-2023 @ 9:50 AM
Senior
Posts: 1587
Joined: Oct 2009
          
What is the I.D. of your brake drums? They may have been turned to too large of a diameter sometime in the past. If the I.D.s are too large, you will have to install thicker linings on the shoes to get functioning brakes.

51woodie
04-13-2024 @ 7:14 AM
Senior
Posts: 509
Joined: Jan 2017
          
Bobb. Is this car "new" to you? The description you gave of the linings indicates they are in good order, but do the shoes have full contact on all the linings? Here is a picture that shows what I experienced with poor contact and lousy brakes, until I arced all the linings.

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