03-12-2016, 04:18 PM | #1 |
Senior Member
Join Date: May 2010
Location: Moncks Corner, SC
Posts: 439
|
Brake dilema
Doing a brake job on my 1940 Ford coupe. Dilema, can't get the rear drums on. New shoes and new drums. Drums been turned to make true. Front drums installed. I have taken all the adjustment out of the rear brakes. Shoes won't go inward any more. Help....
|
03-12-2016, 04:40 PM | #2 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 3,255
|
Re: Brake dilema
Have you tried moving the anchor adjustment bolts at the bottom. They center the shoes in the drum. I know the instructions say the dots should face each other but Ive found that sometimes they need to be turned slightly up or down to get the drum on.
|
Sponsored Links (Register now to hide all advertisements) |
|
03-12-2016, 05:44 PM | #3 |
Senior Member
Join Date: Sep 2013
Posts: 1,027
|
Re: Brake dilema
Is your emergency brake on?
|
03-12-2016, 06:47 PM | #4 |
Senior Member
Join Date: May 2010
Location: Moncks Corner, SC
Posts: 439
|
Re: Brake dilema
I finally got the drums to go on but there is lots of drag. I can hand turn them with lots of effort. Should I drive the car and let the drums and shoes wear in?
|
03-12-2016, 06:52 PM | #5 |
Senior Member
Join Date: May 2010
Location: Illinois
Posts: 2,183
|
Re: Brake dilema
X 2 39 topless. If your emergency brake was set for old shoes,it could be dragging.
John |
03-12-2016, 07:51 PM | #6 |
Senior Member
Join Date: May 2010
Location: Moncks Corner, SC
Posts: 439
|
Re: Brake dilema
|
03-12-2016, 08:50 PM | #7 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,919
|
Re: Brake dilema
Long ago I know I saw in a tech book how thick the OEM 40 Ford brake linings were.
I think it was .18 in. Can anyone verify this? |
03-12-2016, 09:35 PM | #8 | |
Senior Member
Join Date: May 2010
Location: Southern California
Posts: 7,030
|
Re: Brake dilema
Quote:
Charlie Stephens |
|
03-12-2016, 09:49 PM | #9 |
Senior Member
Join Date: Nov 2012
Location: Elgin Illinois
Posts: 736
|
Re: Brake dilema
Yes, Pull the drums off and then take the shoes off and set them inside the drums to see how close they match. Is there any residual pressure in the wheel cylinder?
|
03-12-2016, 10:12 PM | #10 |
Senior Member
Join Date: May 2010
Location: Mill Valley,Ca.
Posts: 1,509
|
Re: Brake dilema
When properly arced, the shoe should make contact with the drum at the shoe center.
There should be clearance at the ends. I usually push the end of the shoe against the drum (2" from the end) and look for 1/16"-1/8" clearance at the other end of the shoe. Karl |
03-13-2016, 08:49 AM | #11 | |
Senior Member
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,106
|
Re: Brake dilema
Quote:
The reason shoes are "arced" in the first place is to remedy the exact phenomenon you describe. DD |
|
03-13-2016, 11:50 AM | #12 | |
Senior Member
Join Date: May 2010
Location: Mill Valley,Ca.
Posts: 1,509
|
Re: Brake dilema
Quote:
When you step on the brakes with a shoe that fits the radius of the drum perfectly, and add force, the shoe bends ever so slightly,the ends of the brake material recieve most of the pressure. As this continues, the center of the brake material does less of the work. With the first contact being in the center of the shoe, increase in force bends the shoe (ever so slightly) to increase the shoe contact area. While I've never read this in a book, I got the theory for more than one old guy. (1960's, 1970's) I worked in an automotive machine shop for quite a while. I arced a lot of shoes. Most of the shops I machined drums for sent the shoes to be arced. Karl |
|
03-13-2016, 11:55 AM | #13 |
Senior Member
Join Date: May 2010
Location: Hansville, WA
Posts: 776
|
Re: Brake dilema
The truck shop that arced the shoes on my tonner cut about 2" off the lining on the rear shoes and tapered the leading and trailing edges of all the linings. When I asked the shop foreman why, he said that the rear shoes provided primary braking force in reverse only and by reducing the lining area on the rear shoes it reduced unneeded friction on the drums which would extend the drums service life. He said the tapers were to prevent the brakes from locking up in a panic stop. Whether or not this might help the "binding" condition you have on your rear drums I can't say, but its something to consider. The attached photo shows the right rear backing plate and shoes on the tonner.
|
03-13-2016, 12:48 PM | #14 | |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: Brake dilema
Quote:
|
|
03-13-2016, 03:27 PM | #15 |
Senior Member
Join Date: May 2010
Posts: 893
|
Re: Brake dilema
Just measured some n.o.s. lining O1A-2022 the thickness is .210-.212 till the tapered end which is .150 hope this helps. Of course these are the-kind they rivet on because they are n.o.s
|
03-13-2016, 04:25 PM | #16 | |
Senior Member
Join Date: May 2010
Location: Mill Valley,Ca.
Posts: 1,509
|
Re: Brake dilema
Quote:
As an addition to this discussion, some where in the early 1970's, Wagner brand brake shoes put forth the notion that they had found a shoe arc that would work with all drum sizes from standard to the maximum oversize, .060 from standard. This made customers come away from the notion that arcing was a necessary practice to be used every time a brake job was done. I always check the arc. Karl |
|
03-13-2016, 06:34 PM | #17 |
Senior Member
Join Date: May 2010
Location: Mid coast Maine
Posts: 1,878
|
Re: Brake dilema
If you look at post #13 you see that the ends are tapered back. Some times the only arches you will find is mickey ds. The shoes are some times to long and taper makes them shorted. If you measure the end of the shoes most likely they are longer then the id of drum. I was tough to chamfer both ends like a wood chisel.
|
03-13-2016, 08:20 PM | #18 |
Senior Member
Join Date: Dec 2010
Location: North of sandy ago, CA.
Posts: 2,064
|
Re: Brake dilema
In the early 1960's I did a lot of brake jobs. I would put the shoe in a vise and file the ends of the shoes toll it laid in the drum nicely. "Shoes arc'ed"
Bruce
__________________
Works good Lasts long time |
03-13-2016, 08:42 PM | #19 |
Senior Member
Join Date: Aug 2012
Location: Perth, Western Australia
Posts: 2,687
|
Re: Brake dilema
IS it oversized linings? hence the need of material to be taken off = arching..
I think this is must be the way you guys do it in the U.S. Here we have first , second, third oversize. Once the drum is measured to determine which one its been machined to, you simply fit that lining, done!
__________________
"Came too close to dying to stop living now!" |
03-13-2016, 09:59 PM | #20 |
Senior Member
Join Date: Aug 2010
Location: newark, delaware
Posts: 3,735
|
Re: Brake dilema
The OP said new shoes and new drums. Wasn't there some recent complaints about some of the new brake shoes that are now available?
|
Thread Tools | |
Display Modes | |
|
|
Sponsored Links (Register now to hide all advertisements) |
|