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New brakes, new problem
https://slantsix.org/forum/viewtopic.php?t=41362		 Page 1 of 1
Author:  tgr23 [ Sun Aug 08, 2010 8:15 pm ]
Post subject:  New brakes, new problem
Just finished replacing shoes, drums and springs on 10" brake setup. Now I've got a weird sound under braking from left front. It sounds like as the wheel rotates there is a slight catch on something. There is no sound when the brakes are not applied. The brakes are installed exactly as the right side and match the FSM and a 69 dart living next door. I'm sort of at a loss right now. I just re-read the FSM and the only thing i missed was greasing the shoe contact points. Could this be it? What sort of grease is recommended?

Thanks
Travis
Author:  wjajr [ Mon Aug 09, 2010 5:02 am ]
Post subject: 
I have used a bit of never seize on the backing plate’s contact pad. Any hard grease can be used provided it is applied very very sparingly. Sometimes one has to smooth that pad up a bit, removing rust, and feathering any worn-in spots that can cause a catching or free easy movement of the new part.


Did you mount the shoes with the primary shoe (shortest lining surface of the two) facing forward? If shoes are reversed all, sorts of strange occurrences will take place, when brakes are applied.

Bill
Author:  tgr23 [ Mon Aug 09, 2010 11:44 am ]
Post subject: 
I'll look at the backing plate and lube those spots to see if that helps. Pretty sure the shoes are on correct.

http://s756.photobucket.com/albums/xx21 ... tfront.jpg
Author:  tgr23 [ Mon Aug 09, 2010 7:51 pm ]
Post subject: 
Problem solved. I was told that I probably had a problem with the spiral machine marks on the new drums locking in with the new shoes. As the wheel would turn the shoes would ride the groove out off the backing plate and snap back. So the fix was to sand the drums removing the spiraling pattern on the friction surface. Also sanded the shoes. Once I did this the problem was solved.
Author:  wjajr [ Tue Aug 10, 2010 5:01 am ]
Post subject: 
An easy fix. But an unnecessary one had the machine shop had used a better cutting tool in their lathe. Oh well…
Author:  tgr23 [ Tue Aug 10, 2010 6:50 am ]
Post subject: 
For future reference, the drums were new from Raybestos.
Author:  RustyRamcharger [ Sun Aug 29, 2010 11:42 pm ]
Post subject: 
Quote:
For future reference, the drums were new from Raybestos.
Did the box say "Made in China"? They obviously missed the final step in machining the drums.

The last set of Chinese rotors I bought had 0.006" and 0.008" runout out of the box. After turning them and driving 10,000 miles they were warped with 0.005" runout. Turning them again brought them to just under the thickness limit. They then quickly developed 0.003" runout, which has been stable for 50,000 miles.

All of the manufacturers have several quality levels of product. Do a parts lookup on www.rockauto.com and you'll get the full list.

Ken
:-)
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