YBR Drum Brake Squeal

[jeffyjeff]

2015 YBR 125, 18,000 km. I am the original owner. Rear drum brake has developed an annoying squeal on deceleration, approximately from 5kph> 0. I disassembled the brake, blew it clean with compressed air, sanded the drum and the shoes with 100 grit sandpaper (longitudinally), then blew it clean before assembly. The annoying condition remains. I've rebuild drum brakes on automobiles that had primary and secondary brake shoes, so I was careful to assemble the shoes in their original locations (although I could find no indication that the YBR brake pad compounds are different top to bottom).

Brake shoes looked good; light glaze that easily sanded off, and no foreign material embedded into the brake pad material. Contact points to the cam and anchor pin appear to be free of abnormal wear or apparent damage.

Not really clear on the next steps to take, other than to replace the brake shoes with new. Anybody on BCF have suggestions on what I could try next before installing new shoes?
____________________
History shows again and again how nature points out the folly of men - BOC

[stinkwheel]

Try sanding a slight chamfer on the leading edge of the pad material.

EDIT: Also hold the brake on as you tighten the wheel spindle (and anti-torque arm if fitted) so it gets locked down with the pads central in the drum.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[jeffyjeff]

[MCN]

[blurredman]

Yes, rubbing away at the edge can help- as well as centralising the shoes in the wheel. Not a big issue to push the brake lever and tighten up the spindle at the same time.

Although brake dust is an issue, at least it won't be asbestos stuff anymore. I had to modify my original pads from my 1980 car (remove the squealer) and I was careful of that.
____________________
CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 17k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 39k, 1989 MZ ETZ251 - 50k.

[Kentol750]

Every ybr125 we've had in our school has had a noise on deceleration at some point when damp. Change the shoes if you think it's time, but that noise is something I heard every wet day for many years.
____________________
Some bikes.

[jeffyjeff]

[stinkwheel]

In that case, chalk line the shoes and laboriously bed them perfectly.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[jeffyjeff]

[MCN]

[jeffyjeff]

[jeffyjeff]