Hey all. I bought a used Chinese scoot a few months ago and have been having some trouble with the rear brake. It does not seem to provide much, if any, stopping power. When the scoot is on the center stand, the brakes appear to stop the tire, but when I am riding the scooter, the most the rear brakes will do is slow the bike down a little. At first I thought the drum shoes were glazed, so I bought new ones and installed them(http://www.partsforscooters.com/Brake-Shoe-Set). Same thing happens. The brakes appear the stop the scoot at very low speeds but do nothing when riding over 10mph. I played with the brake trim adjustment. I am sure the brake pads are pushing against the drum.
On a side note, my rear tire will deflate over the course of the week. I loses 4-5 psi per day and is usually flat by the end of the week if I do not put air in it. I had a new tire put on and the same thing happens. Checked for leaks and found nothing. I am thinking damaged rim?
Post by shadowwalker on Oct 3, 2010 2:31:55 GMT -5
Ok have you tightened the adjuster for the rear brakes? It is the gold 9/16 nut that is on the end of the rear brake cable. Adjust it so the rear wheel spins freely but there is very little pull to the brake handle. These cables are notorious for stretching and loosening the feel of the brakes. The deflating tire deal sounds like you might have a ding in the rims bead area or even possibly a hairline crack in the wheel. If you don't see any obvious damage put a small amount of fix a flat in the wheel then go for a ride to distribute it evenly. This should seal any pinhole leaks you might have.
Thanks for the tips. I did tighten the adjuster for the rear brakes to the point where there was little pull in the brake cable. Still, the brakes have little effect while riding the scooter. No matter how hard I pull the brakes, it just slows down a little. Should I take the scoot to a mechanic?
Right after I bought this scoot, I tried to check the tire pressure and the valve stem broke off. I replaced it with a bent metal valve stem, but dont have a cap on it. I will see if the cap prevents air leakage.
A damaged rear brake cable can act like this......if the outer cover is broken somewhere, or maybe if an attachment clamp came loose or is missing.
The valve stem cap is not the problem.....the valve core maybe is loose/leaking, the tire bead is not sealing properly, etc. The exact leak can usually be found with a spray of detergent and water.....over- fill the tire with air and spray it down. The leak will bubble up.....
It's simple to tell if the valve stem is leaking past the check valve. Just put a little spittle on the tip of your finger and wipe it on the tip of the valve so that it forms a film over the end. Any leakage will immediately form a bubble. Yeah I know to some people it's gross but it works.
Ok, I checked the rear brake cable and it looks fine. However, when I took off the rear tire, I noticed the new brake shoes were coated in a layer of grey dust. This did not come from the new brakes shoes as the pads on them are green. It also looks like only part of the brake shoe is hitting the drum when the brakes are applied. Should I sand part of the pad down so they hit the drum evenly?
That's the way they should look. The brakes are hinged at the top or bottom and the just touch on a small area.
The rear brakes aren't designed to stop the bike. You should be using the front and rear brakes together. The fronts do about 90% of the stopping and the rear brakes simply drag (10%) to prevent the rear of the scooter from sliding out sideways...
Yes, unlike bicycles you can't lock up the rear brake on a scooter (mine anyway). Bikes weigh around 20 lbs. whereas most scooters are at least ten times that. Just get used to applying both brake levers with about the same pressure in most circumstances...
Last Edit: Oct 10, 2010 10:29:26 GMT -5 by voorhees
I'm somewhat puzzled about some of these posts. Certainly the rear drum brake on a Chinese scoot won't be as powerful as the front disk brake.......and I guess some rear drum setups won't be as powerful as others. But to call the rear brake "almost useless"......very misleading.
My Eagle 50 and my Roketa 50 both have an identical-looking rear drum brake. Each will lock up the rear wheel if necessary, when used with the front brake. Using the rear brake by itself (I weigh 235) won't lock up the wheel......but it will stop the scooter fairly well.
My guess....there really is a problem with the rear drum brake, that needs to be figured out.
FWIW......my first scoot was a '57 Cushman Highlander. It only had a rear drum brake. It stopped ok (I'm still alive).....and would lock up the rear wheel even when riding double. That's why I'm still around.....
Last Edit: Oct 12, 2010 4:44:22 GMT -5 by Bluefront
I checked the cam and brake cable, both are working properly. I clamped the two brake shoes together and tried to squeeze the rear brake.. It wouldn't budge. Now, I noticed the grey powder on the brake pad is coming rubbing off from the inside of the drum. Is this supposed to happen? I thought the brake pads are supposed to wear, not the inside of the drum..
Humm....I doubt you're seeing any dust from the drum itself. I'd be tempted to find a new set of shoes. Perhaps the composition of the friction material is too hard for whatever reason, and not gripping properly.
Nope, I am sure its from the drum. The brake pads are made of a green material. I tried sanding the inside of the drum with fine sandpaper to roughen it, and the same gray dust that is on my brake pads came off from the drum. It feels as if this powder is causing the brakes to slip, but I cant be certain as I have not ridden another scooter that I could compare rear brakes with.
wereed: HOw can I start a thread?
Jun 1, 2013 10:55:49 GMT -5
wereed: or respond to a thread I started three years ago...
Jun 1, 2013 10:56:07 GMT -5
marklorenzi: I just bought one of the Fleetwoods. They look like a clone of the Honda XRM's they sell overseas. It is in transit now and I should get it this week. I will try to post my experience here. Call me the guinea pig hahaha.
Jun 2, 2013 20:29:11 GMT -5
flyangler: wereed, this forum is read only the new forum is on the banner above. Dan
Jun 5, 2013 7:35:29 GMT -5
silkyg1973: can someone please tell me how to post
Jun 10, 2013 12:08:46 GMT -5