You should be able to lock up your rear brakes. Take them apart there could be crap on the shoes. One of the kids quads I have the rear brakes didnt' work right from new. I clean the shoes off but still no brakes. Went back to the dealer and got a new set and they've been working fine now for 2 years. My old Honda quad has brake issues but its when they get wet and muddy. They don't seem to like those conditons too much!



I didn't know the Baja 250's were being made by jianshe now. I know the Jainshee quad sure looks just ike the Baja 250 at CT but the time I checked the Baja was made in a different factory.

 

Still waiting for my new drum, it's been 3 weeks. My front brakes have worked great since day one with out ajustment. my rear brakes haven't in months.

 

I see Baja has a new 400cc 4-wheel drive ATV now.......according to my lastest PepBoys sale ad.......listed at $ 4,400......wow they are not messing around and going after the bigger boys now.

 

My fronts have worked great from day one with no adjustments. The rears however are a whole different story. They were not bad, but they soon got to the point where they were pretty nuch useless. I adjusted them and about 20 km down the trail, they were useless again. I adjust them and then a few kms down the trail, they are useless again. Either the friction material is made of marshmallow, or the adjustement hardware is not holding it`s position. I`ll try them out this summer, but if no better, I might try to stick some Yamaha parts on and see if that makes them better. I had an old Honda trail bike that I used to treat like a quad and never had any problems with the back brakes even when they were soaking wet and full of mud.

 

I have the Loncin model. Your rears may also have some contaminants on the shoes as well. Take the rear one apart and clean and sand the drum and shoes and see if that helps. I forgot to mention on my previous post that if the contamination has been absorbed deep down in the brake material, then the only way to get good brakes is to clean the drum and rotors and replace the pads and shoes. When I have to do mine I will be using Yamaha parts. Hope you get them working soon.

 

If the china ones don't seem to work or got too soaked with stuff you could try the Yamaha ones like you said. Or got to a clutch and brake shop and just have them reline the shoes or pads etc. I've done this before when I couldn't get a brake part or the dealer wanted a stupid price for it. Also they can usally put on better stuff then what came from the factory, just tell them the application there to be used in. I think the little brake shoes on my Honda quad go for 80 bucks!!! The friction materail on them is worth like $5 tops.

 

I took the wheel off and opened up the drum. Looks like there was grease in there at one point. I cleaned and sanded the pads and the drum but that didn't help. I think I'll need to get the shoes relined or get some new ones. One thing I noticed was that the space where the drum meets the lip on the bike side wasn't evenly spaced all around. It was a little closer at the top then the bottom. I am wondering if somehow its crooked and is causing the pads not to make even contact with the drum. I suppose the easiest thing to do will be to try new shoes. If that doesn't work I know something else is up. I think I'll take the shoes and the drum to a brake shop and let them take a look. I'll probably just get the shoes re-lined. Thanks for the advice guys.

Brendin

 

To continue this thread, I have taken my Baja in for repairs. Has anyone else had problems with their front lower A arms where they connect to the frame. My problem is that the bushings are so worn out that it clunks terribly. They were loose right from the beginning so this was not a surprise. The bolts were tight from the start so it wasn't from that. It seemed like the bushings were worn out. The other problems are the speedo/odo do not work but the digital dash works fine(sensor is my guess), and the front wheel bearings are toast already. I pulled the hub off and there was no grease in them right from the factory. If this was still not under warranty I would have regreased them or replaced them at that time but why when I can get new ones for free. For those of you who have these, you may want to check the wheel bearings and regrease them. They are very easy to do.

 

<div class="FTQUOTE"><begin quote>Originally posted by: fullup

To continue this thread, I have taken my Baja in for repairs. Has anyone else had problems with their front lower A arms where they connect to the frame. My problem is that the bushings are so worn out that it clunks terribly. They were loose right from the beginning so this was not a surprise. The bolts were tight from the start so it wasn't from that. It seemed like the bushings were worn out. The other problems are the speedo/odo do not work but the digital dash works fine(sensor is my guess), and the front wheel bearings are toast already. I pulled the hub off and there was no grease in them right from the factory. If this was still not under warranty I would have regreased them or replaced them at that time but why when I can get new ones for free. For those of you who have these, you may want to check the wheel bearings and regrease them. They are very easy to do.</end quote></div>

So what kind of grease should you use and how do you do it?

thanks,
Brendin

 

The bearings are sealed bearings. I have been successful at removing one side of the bearing and filling it with a good water resistant grease. Then put the side back on and install the bearing again. If you are not comfortable with removing the bearing and disassembly then I would wait until they are toast and order new ones from a bearing store or buy Yamaha(pricey). A good bearing store should be able to cross reference the # or take measurements and get you one.