We were off from Whitby to Grosmont a few days ago with a shiny new drum brake. On the final hill down into Grosmont - narrow, steep, and be-caged - Clare suggested we get off and walk, and I agreed.
Of course, pushing a fully laden tandem down a 1 in 5 is quite a bit of work, so I put the drum brake on a bit. It then produced the most amazingly loud steady note as long as I was walking. Slowing down made it die out; I can't tell if the tone changed.
Anyone else encountered this? -- David Damerell <[email hidden]> Kill the tomato! Today is Gloucesterday, October.
"David Damerell" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
We were off from Whitby to Grosmont a few days ago with a shiny new drum brake. On the final hill down into Grosmont - narrow, steep, and be-caged - Clare suggested we get off and walk, and I agreed.
Of course, pushing a fully laden tandem down a 1 in 5 is quite a bit of work, so I put the drum brake on a bit. It then produced the most amazingly loud steady note as long as I was walking. Slowing down made it die out; I can't tell if the tone changed.
Anyone else encountered this?
No, because I don't walk down hills :-) (on road...)
We were off from Whitby to Grosmont a few days ago with a shiny new drum brake.
I didn't knew they were still being produced (or are you referring to roller brakes?).
Quoted message said:
On the final hill down into Grosmont - narrow, steep, and be-caged - Clare suggested we get off and walk, and I agreed.
Of course, pushing a fully laden tandem down a 1 in 5 is quite a bit of work, so I put the drum brake on a bit. It then produced the most amazingly loud steady note as long as I was walking. Slowing down made it die out; I can't tell if the tone changed.
Anyone else encountered this?
Resonance in drum brakes can be caused by the brake shoes being glazed over, at certain speeds and brake force this can result in resonance. I'd say that on a tandem that is being ridden in hilly terrain there is significant chance of brake shoes glazing over.
If on the other hand you are referring to roller brakes, then it is a sign that they need re-greasing.
We were off from Whitby to Grosmont a few days ago with a shiny new drum brake.
I didn't knew they were still being produced (or are you referring to roller brakes?).
My 8 Freight has SRAM drums, Sturmey/Sunrace make them too, and you'll see plenty in NL. Standard on ICE trikes and Windcheetahs too.
Pete. -- Peter Clinch Medical Physics IT Officer Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital Fax 44 1382 640177 Dundee DD1 9SY Scotland UK net [email hidden] http://www.dundee.ac.uk/~pjclinch/
We were off from Whitby to Grosmont a few days ago with a shiny new drum brake.
I didn't knew they were still being produced
The Arai drum brake is still made and very commonly fitted to tandems, and that is what I mean. It's not a roller brake.
The new Sturmey-Archer also still make what they describe as drum brake hubs.
Quoted message said:
Resonance in drum brakes can be caused by the brake shoes being glazed over, at certain speeds and brake force this can result in resonance.
That would be a bit unfortunate after only 3 descents on an otherwise completely new brake. I might take a look inside. -- David Damerell <[email hidden]> Kill the tomato! Today is Gloucesterday, October.
Resonance in drum brakes can be caused by the brake shoes being glazed over, at certain speeds and brake force this can result in resonance.
That would be a bit unfortunate after only 3 descents on an otherwise completely new brake. I might take a look inside.
Glazing typically occurs due to overheating, for example continues use of the brakes on longer downhill stretches. If that doesn't apply then it seems unlikely that glazed brake shoes are the cause.
Alternatively it could be that the brake shoe hasn't yet had time to wear so that it matches the shape of the drum and evenly presses against the drum. If that is the case then it should resolve itself after a bit more use.
Alternatively it could be that the brake shoe hasn't yet had time to wear so that it matches the shape of the drum and evenly presses against the drum. If that is the case then it should resolve itself after a bit more use.
Forgot to add another option: the new brake material might have a thin hard outer skin due to the production process and/or be too smooth. Roughing it up with sandpaper will help in that case.
Glazing typically occurs due to overheating, for example continues use of the brakes on longer downhill stretches.
That seems rather unlikely, this being the exact intended use of the Arai drum. The previous one has been LEJOG twice and goodness knows what else without making this howl.
The "not quite bedded in" scenario seems more likely; I'll keep an eye on it. -- David Damerell <[email hidden]> Kill the tomato! Today is Gloucesterday, October.
