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Sam Buchanan

brake adjustment tool--UPDATED

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In a previous thread I showed how I made a brake adjustment tool using a length of steel tubing, some all-thread and a piece of angle. The tool worked fairly well but had some inherent imprecision due to the tubing not being a real tight fit on the axle threads. This was really obvious on the rear axles due to the threads being worn.

 

I've modified the tool and it now works very nicely and accurately. Instead of the all-thread being welded to steel tube, it is welded to a 3/4"-16 nut. This removes any significant play in the indicator.

 

brake-tool-7.jpg

 

Before removing the wheel drum, one minor cam adjuster is tightened enough to create noticeable drag on the drum. The drum is then removed and the brake tool is threaded onto the axle.

 

brake-tool-8.jpg

 

The pointer is located over the portion of the shoe that contacted the drum which indicates the ID of the drum and adjusted for a snug fit on the shoe. If you want to get really fancy a 0.006" feeler gauge can be inserted between the pointer and shoe. I tried chalking the shoe to assist with indicating the high point during the initial adjustment but didn't find it to be of any advantage. Notice how these brand new shoes have not yet worn enough to have full contact with the drum. I'll readjust the brakes after some miles have accumulated on the shoes.

 

Once the pointer is adjusted to match the high point of the shoe that was adjusted against the drum, the tool is swept over each shoe so the major and minor cam adjustments can be set so each shoe is concentric with the drum. Hopefully this will remove some of the mystery of adjusting the brakes and provide visual confirmation of proper adjustment.

 

Edited by Sam Buchanan

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8 minutes ago, chrysler1941 said:

Very nice but is this a new nut? If so from where and size?

 

Yes, new and purchased from an Amazon vendor, also available at McMaster Carr. It is 3/4"-16, you might find one at a good auto supply house or in the axle nut junk box of a gearhead. If using an experienced axle nut be sure the threads are still tight. The big-box stores will probably only have the course-thread 3/4"-10.

Edited by Sam Buchanan

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3 minutes ago, Sam Buchanan said:

 

Yes, new and purchased from an Amazon vendor, also available at McMaster Carr. It is 3/4"-16, you might find one at a good auto supply house or in the axle nut junk box of a gearhead. The big-box stores will probably only have the course-thread 3/4"-10.

Thank you 😃

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Great tool. What are your plans for adjusting the rear brakes? They don’t have a shaft to screw onto right?

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1 hour ago, 51_Meadowbrook said:

Great tool. What are your plans for adjusting the rear brakes? They don’t have a shaft to screw onto right?

 

The nut will thread onto the rear axle just as it does on the front.

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