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Re: Front Disc Brake conversion problem
raleigh58 #1349814 Fri Mar 13 2020 06:58 PM
Joined: Jun 2005
Posts: 484
R
Shop Shark
DADS50

You and I are on the same page. My brake pedal will not fully return and therefore causes the brake light switch to stay activated. This happened early on and ran my battery down. Now I at least know to check before parking the truck for an extended period. Doing my paying job today. Perhaps the wife can help me a little with diagnostics tomorrow.

Thanks for your assistance.

John

Re: Front Disc Brake conversion problem
raleigh58 #1349831 Fri Mar 13 2020 10:54 PM
Joined: Sep 2010
Posts: 1,538
W
Shop Shark
I had to add brake pedal return springs so the brake lights would go off.


Wayne

When I die, I hope she doesn't sell everything for what I told her I paid for it!

1938 1-Ton Farm Truck
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Re: Front Disc Brake conversion problem
raleigh58 #1349918 Sat Mar 14 2020 05:46 PM
Joined: Jan 2013
Posts: 1,719
Shop Shark
I have a spring but still lift up on the bottom of the brake peddle when shifting to ensure the light stays off

Re: Front Disc Brake conversion problem
raleigh58 #1350193 Mon Mar 16 2020 02:09 PM
Joined: Jun 2005
Posts: 484
R
Shop Shark
I have a BIG brake pedal return spring and getting really tired of having to reach down and lift up on the brake pedal to not only make sure the brake lights are off, but to release the brakes from them staying partially engaged. Not a very fun drive nor is it safe.

John in NC

Re: Front Disc Brake conversion problem
raleigh58 #1350227 Mon Mar 16 2020 06:16 PM
Joined: Jan 2010
Posts: 4,511
D
Shop Shark
How does the alignment look between the mc and the brake pedal attachment?


Do you have a pic you can post?

Re: Front Disc Brake conversion problem
raleigh58 #1350239 Mon Mar 16 2020 07:29 PM
Joined: Feb 2004
Posts: 20,351
H
Boltergeist
If you can make the brakes function normally by pulling up on the pedal with your toe, common sense dictates that you need a stronger pedal return spring. There should be NO contact between the pedal linkage and the master cylinder or the booster plunger before the pedal travels at least a healthy fraction of an inch- - - - -just like a clutch pedal.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
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Re: Front Disc Brake conversion problem
raleigh58 #1350303 Tue Mar 17 2020 01:07 AM
Joined: May 2005
Posts: 119
5
Shop Shark
I had the same problem with my power brake system under the floor, and had to replace the new booster as it was defective out of the box. Adding a bigger spring did not consistently solve the problem. If yours is power brakes they probably need to replace the vacuum booster. The new booster solved the problem completely for me.

Mark

Re: Front Disc Brake conversion problem
raleigh58 #1350325 Tue Mar 17 2020 03:21 AM
Joined: Mar 2004
Posts: 4,497
M
Shop Shark
Also make sure the pedal isn't dragging on the floor board, floor mat or carpet. I had the carpet pad get pinched in the floor board pedal hole cause that same problem...

Mike B smile

Re: Front Disc Brake conversion problem
Mike B #1350359 Tue Mar 17 2020 01:25 PM
Joined: Jun 2005
Posts: 484
R
Shop Shark
I believe my problem is with the booster. Plenty of room around the pedal to not get stuck on the firewall, no carpet to get caught on and only the thin rubber floor mat. It seems to have progressively gotten worse since we picked up the truck in October.

Re: Front Disc Brake conversion problem
raleigh58 #1352257 Sun Mar 29 2020 06:10 PM
Joined: Jun 2005
Posts: 484
R
Shop Shark
My restoration included having disc brakes with a power brake booster installed for the front brakes only. I stayed with drum brakes on the rear. Just wondering if anyone has installed a #5559BB from Classic Performance Products, Inc. and how it worked or didn't work for you.

Thanks,

John

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