Hi everyone.
I had a slight brake problem with my electric folder. (For those that didn't know, i bought it from ebay and fitted my own battery).
When ever i applied the rear brake it would lock on and send me snaking down the road like Evel Kneival.....
When it warmed up a bit, the brake seemed ok but there was obviously somthing wrong. The chrome cover would also move quite a bit. At a quick glance i assumed it was some sort of band around a drum that was pulled tight.
I decided enough was enough and stripped the whole assembly down where i found a servo drum brake hiding there. It's a bit of a pain to get the wheel/hub out, so i thought i'd clean it and reset everything so i wouldn't have to dismantle it ever again.
I took some pictures as i went.
It also occurred to me that there must be quite a few ebikes with this design rear brake, but how many people know how they work or know how to adjust them?
My bike has never had the rear adjusted from new. How do i know this?
The adjustment screw has not been moved.....look at the gap in the first picture.
As you can see the insides were a bit mucky, the shiney part of the drum is where i wiped it clean. It seems like the linings were not actually 'bedded in' very well and obviously not working as it should.
The mechanism works like this, the big triangular shaped cam pushes the first lining toward the drum surface and the first lining also pushes the second lining via the round adjustment cam (to the right).
This picture will show that only the second lining is fixed, the actuator cam pushes the first lining (and the second lining) expanding outwards to wards the drum.
I had a slight brake problem with my electric folder. (For those that didn't know, i bought it from ebay and fitted my own battery).
When ever i applied the rear brake it would lock on and send me snaking down the road like Evel Kneival.....
When it warmed up a bit, the brake seemed ok but there was obviously somthing wrong. The chrome cover would also move quite a bit. At a quick glance i assumed it was some sort of band around a drum that was pulled tight.
I decided enough was enough and stripped the whole assembly down where i found a servo drum brake hiding there. It's a bit of a pain to get the wheel/hub out, so i thought i'd clean it and reset everything so i wouldn't have to dismantle it ever again.
I took some pictures as i went.
It also occurred to me that there must be quite a few ebikes with this design rear brake, but how many people know how they work or know how to adjust them?
My bike has never had the rear adjusted from new. How do i know this?
The adjustment screw has not been moved.....look at the gap in the first picture.
As you can see the insides were a bit mucky, the shiney part of the drum is where i wiped it clean. It seems like the linings were not actually 'bedded in' very well and obviously not working as it should.
The mechanism works like this, the big triangular shaped cam pushes the first lining toward the drum surface and the first lining also pushes the second lining via the round adjustment cam (to the right).
This picture will show that only the second lining is fixed, the actuator cam pushes the first lining (and the second lining) expanding outwards to wards the drum.