|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
05-28-2020, 05:39 AM | #1 |
Junior Member
Join Date: Jun 2019
Location: Mottville ,New York
Posts: 9
|
Brake centering
I'm doing my 1st brake job on the front of my 1930 fordor. I welded the roller track and ground the hight right at 1.312, the front shoe is high by about .090. Is it normal to have to remove that much material from the roller track to center the shoe. All the parts are new and measure up correctly.
|
05-28-2020, 09:26 AM | #2 | |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,507
|
Re: Brake centering
Quote:
Oh, and welcome to Fordbarn. (The best place to get accurate answers to your questions!! ) |
|
Sponsored Links (Register now to hide all advertisements) |
|
05-28-2020, 09:43 AM | #3 |
Junior Member
Join Date: Jun 2019
Location: Mottville ,New York
Posts: 9
|
Re: Brake centering
Thanks, It is from Les Andrew's book , I think I have the dimension correct. From the rivet to the roller track surface. I don't have the book with me. 1 5/16"
|
05-28-2020, 09:54 AM | #4 |
Junior Member
Join Date: Jun 2019
Location: Mottville ,New York
Posts: 9
|
Re: Brake centering
He says to bend the track to adjust. I'm not going to bend it .090
|
05-28-2020, 10:08 AM | #5 |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,507
|
Re: Brake centering
Unfortunately, his measurements are incorrect. Below is a PDF file that I made which gives you several references to verify the measurements with. The lower pic is from the original print that shows Ford's specifications. While it is not the 0.090" as you are finding, there is likely the majority of your issue.
Another FWIW, if all the other brake components are to Ford's specs, and the tracks are correctly sized and located, then I find a centering tool is unnecessary. . |
05-28-2020, 10:15 AM | #6 |
Junior Member
Join Date: Jun 2019
Location: Mottville ,New York
Posts: 9
|
Re: Brake centering
Sponsored Links (Register now to hide all advertisements)
|
05-28-2020, 10:29 AM | #7 |
Junior Member
Join Date: Jun 2019
Location: Mottville ,New York
Posts: 9
|
Re: Brake centering
After further thought. I think Les' measurement is from the rivet head which is probably the difference.
|
05-28-2020, 11:07 AM | #8 |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,507
|
Re: Brake centering
Actually, in the PDF that I uploaded, it shows the measurement is taken from the lower portion of the hole. In my calculations, I show where that hole in the track is supposed to be 0.260", and so I factored in ½ of the hole's diameter and added to his specification. Then I compared Les' number to the Ford specification which is where I got the 0.055" discrepancy.
|
05-28-2020, 03:35 PM | #9 |
Senior Member
Join Date: Apr 2015
Location: Saint Cloud Mn
Posts: 745
|
Re: Brake centering
Do not Bend the tracks. I replaced all tracks, no welding, no grinding no guessing. What is the hardness of weld over replacement tracks?
|
05-28-2020, 04:06 PM | #10 |
Junior Member
Join Date: Jun 2019
Location: Mottville ,New York
Posts: 9
|
Re: Brake centering
The hardness is comparable to the original. I understand the dimensions and all that is going on, I've been a precision machinist for 40 years. I just have to figure out why this is not centered. I have a set of replacement tracks I could through on but the dimensions of them are the same as the ones I welded. I I just got to figure out what's up.
|
05-28-2020, 05:47 PM | #11 |
Senior Member
Join Date: Aug 2010
Location: Port Orchard, WA
Posts: 1,498
|
Re: Brake centering
A word on brake shoes.
IMHO In the past Raybestos sold a tool for bending the brake shoe core to arc the brakes to fit the drum. This tool was called Raybestos Kam Way. See attached page from a Raybestos catalog. So if you are using old brake shoes you may have a problem if the shoe was bent to allow the shoe arc to match the drum in its past. Bending the shoe will solve one problem; the arc of the lining will match the arc of the brake surface on the brake drum. But it will create another problem. For the sake of clarity the following discussion relates to the front brakes, for the rear brakes the brakes are rotated 90 degrees. Bending the shoe will allow the arc of the lining to match the arc of the brake drum. But when the shoe is bent the distance between the holes for the roller pin and the hole for the pin that holds the brake adjusting shaft is now changed. If the shoe was bent to decrease the arc of the shoe the distance between the two holes was reduced and the shoe will sit lower on the roller track and the arc of the shoe will no longer be concentric with the arc of the inner surface of the brake drum. If the shoe was bent to increase the arc of the shoe the distance between the two holes increased and shoe will sit higher on the roller track and the arc of the shoe will no longer be concentric with the arc of the inner surface of the brake drum. I no longer will use old brake shoe cores. Randy Gross has all his brake shoe cores checked and if they are bent he bends them so they are correct or does not use them.
__________________
1931 160B & 1931 68B If you don't have time to do it right the 1st time, how do you have time to do it the 2nd time? |
05-28-2020, 07:43 PM | #12 |
Junior Member
Join Date: Jun 2019
Location: Mottville ,New York
Posts: 9
|
Re: Brake centering
The shoes are new molded linings from Mac's.
|
05-30-2020, 01:00 PM | #13 |
Junior Member
Join Date: Jun 2019
Location: Mottville ,New York
Posts: 9
|
Re: Brake centering
Well, after taking the backing plates and all the components into work and measuring everything, the only thing I could see that was off at all was the roller track needing .015 to come off. So I cut the .015 of on the Bridgeport. Well this morning I put things back together and voila, It all works now, the shoes are on center. I can't believe that was all the problem. Thanks for all the thoughts, especially the print, it helps to talk things through with people.
|
05-30-2020, 04:06 PM | #14 | |
Member
Join Date: Jul 2018
Posts: 49
|
Re: Brake centering
Quote:
|
|
05-31-2020, 09:54 PM | #15 |
Senior Member
Join Date: Apr 2012
Posts: 1,542
|
Re: Brake centering
BTW, in one of the Service Letters books, the Branch stated that dealers asked to buy the little plate to avoid replacing the whole backing plate. No luck, said the Branch, as the plate went through some kind of adjustment after installation, so the dealer had to replace the entire plate.
|
06-01-2020, 08:39 AM | #16 | |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,507
|
Re: Brake centering
Quote:
I kinda see your point however two things, ... The name of the A-2226/A-2037 part is called a 'Brake Shoe Retracting Spring Stud'. The instructions in Les' book states the measurement is taken from the Spring Stud/Rivet. Why even mention the word rivet if that is not what he meant to measure from, ...and why show the measurement to the edge of the hole instead of the stud? Second, this has been an ongoing issue of confusion for years. That is why I made the PDF so people could understand what the correct dimension should be and where their error is when they follow his instructions. Other people have interpreted this measurement the same way as the OP did here. As mentioned above by Eric, even Ford did not allow the A-2017 to be a service item simply because it takes a fixture to align those where there were 4.622" from the centerline of the spindle to the top of the track glide surface. If you do not have a fixture that locates the tracks correctly, it is very easy to miss the measurement, -or even worse, rivet the track on at an angle and not parallel. |
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|