The Ford Barn

BillCNC · 10-13-2022, 12:33 PM

Hey All,

One of the gentlemen that goes out with us on our weekly breakfast run has a 31 slant window Fordor with the squeakiest brakes on the planet. Yesterday, he finally pulled his drums and this is what he found with one drum.

What would cause the grooving in such even spacing?

Regards
Bill

Curtis in MA · 10-13-2022, 02:35 PM

Are the shoes new?
Are those grooves in the drum or just surface marks?

Synchro909 · 10-13-2022, 04:59 PM

The larger the area of contact between the lining and the drum, the better the brakes.
I bet this was someone's brain wave (fart) to increase the contact area and improve the brakes.
He needs new drums and linings, IMO

ronn · 10-13-2022, 05:30 PM

Synch has it...............

the grooves are for cooling, when your A is rounding the corner at 90 mph.

Gold Digger · 10-13-2022, 05:50 PM

When I was a lad back in the 50's my dad bought a Desoto and the brakes squeaked bad. We noticed that all Chrysler products at that time done the same. He took it to the Chrysler garage and they put a table spoon of dry cement in each brake drum and it stopped the squeaking.

Bob Bidonde · 10-15-2022, 07:55 AM

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I recently removed original pressed-steel drums that someone cut groves into. Although the brakes worked well, the groves caused substantially more wear of the molded lining material I was using.

nkaminar · 10-15-2022, 09:26 AM

I'll go with Synchro on this one.

Dino's A · 10-15-2022, 09:44 AM

What fool would ever think this was a good idea? Really? If it was for an attempt
to improve braking, you don't want a Model A. Maybe a 2022 car with anti lock brakes
better suits you. Model A brakes are the best, they haven't leaked for 90 years!

rotorwrench · 10-15-2022, 04:29 PM

The Lockheed and Bendix brake designers left them flat on the face surfaces so that brake lining wear debris could be shed off. With grooves, the debris tends to get mashed into the bottom of the grooves where it would act a a sort of lubricant. This would reduce the friction which is needed for good braking.

The groove pattern appears to have been deliberate since its so uniform. I've seen plenty of grooves drums but not that uniform.

10-13-2022, 02:35 PM	#2
Curtis in MA Senior Member Join Date: Oct 2017 Location: Leicester, MA Posts: 298	Re: What would cause this? Are the shoes new? Are those grooves in the drum or just surface marks?

10-13-2022, 04:59 PM	#3
Synchro909 Senior Member Join Date: Jun 2014 Location: Melbourne, Australia Posts: 7,552	Re: What would cause this? The larger the area of contact between the lining and the drum, the better the brakes. I bet this was someone's brain wave (fart) to increase the contact area and improve the brakes. He needs new drums and linings, IMO __________________ I'm part of the only ever generation with an analogue childhood and a digital adulthood.

10-13-2022, 05:30 PM	#4
ronn Senior Member Join Date: Feb 2011 Location: NNNNNNNNJJJJJJJJJJ Posts: 6,822	Re: What would cause this? Synch has it............... the grooves are for cooling, when your A is rounding the corner at 90 mph.

10-13-2022, 05:50 PM	#5
Gold Digger Senior Member Join Date: Nov 2011 Location: Arkansas & Alaska Posts: 650	Re: What would cause this? When I was a lad back in the 50's my dad bought a Desoto and the brakes squeaked bad. We noticed that all Chrysler products at that time done the same. He took it to the Chrysler garage and they put a table spoon of dry cement in each brake drum and it stopped the squeaking.

10-15-2022, 09:26 AM	#7
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,995	Re: What would cause this? I'll go with Synchro on this one. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

10-15-2022, 09:44 AM	#8
Dino's A Senior Member Join Date: Jun 2016 Location: Arcadia, Ca. Posts: 254	Re: What would cause this? What fool would ever think this was a good idea? Really? If it was for an attempt to improve braking, you don't want a Model A. Maybe a 2022 car with anti lock brakes better suits you. Model A brakes are the best, they haven't leaked for 90 years!

10-15-2022, 04:29 PM	#9
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,483	Re: What would cause this? The Lockheed and Bendix brake designers left them flat on the face surfaces so that brake lining wear debris could be shed off. With grooves, the debris tends to get mashed into the bottom of the grooves where it would act a a sort of lubricant. This would reduce the friction which is needed for good braking. The groove pattern appears to have been deliberate since its so uniform. I've seen plenty of grooves drums but not that uniform.