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Are you able to jack it up and turn the back tires by hand? If you can't check and see if the brake cable is correct and isn't too tight? But it could also be bad brakes, not enough brake fluid, or the biggest problem could be a bad brake master cylinder..
Hey Carl, Have you checked to see if the piston is sticking in the caliper or have you tried to bleed the system a little?
Try the system bleeding first... shouldn't take much if you have air in the line..(This is the same for the front or rear brakes.)
If you have been riding in mud, dirt, water, (I know-that's where we all ride!)..sometimes the piston (The brake caliper piston - NOT the engine piston) will get a tiny bit of corrosion around it and start sticking..this will cause the brakes to seem if they are on constantly.. IF your progress to diagnose this gets this far.. it is a fix for someone with some experience and knowledge. It requires removal and disassembly of the calipers, cleaning of the caliper, replacing the caliper o-ring, wet sanding the O.D. of the piston with brake fluid and 1200 grit sand paper, then a thorough cleaning of the caliper piston. Then reassembling all these cleaned (and the piston/o-ring lubed with brake fluid). installed back on the atv, ..ALL the brake system fluid should have been replaced and now the system bled completely. If you have more questions, reply to me.
Hey. Take your caliper off. Loosen your brake fluid cap and take a pair of vise grips and squeeze the caliper bad slowly. Some you may have to turn the caliper a little to get it to go back. Hope this answers your question
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www.youtube.com/watch?v=n5oO7v3nT6s
Mar 11, 2012 - Uploaded by myquadrepair
Removing the rear brake drum & shoes on Yamaha grizzly 600. ... Yamaha Big Bear Oil Change and More! - Duration: 10:43. by jfrost77hd ...
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https://www.youtube.com/watch?v=xQanZdlDCI0
Jul 17, 2012 - Uploaded by 400EX99N
HOW TO CHANGE REAR BRAKES ON A HONDA ATV. ... is this about the same for a 2004 yamaha big bear 400? Read more Show less.
Does your model use hydraulic brakes? Many models don't. Check your manual and if you don't have one, go to the mfr's web site and download one. Otherwise, try it out. If the brakes seem to be working fine... why fix it, if it ain't broke! If the brakes, don't feel right, then you will have to bleed hydraulic lines and slowly top up with the proper viscosity and thermal property brake fluid. If there are problems getting brake pad pressure after filling the master cylinder and bleeding the brakes, the master cylinder will need replacing.
remove adjustment cover on rear brakes. attempt adj to loosen brakes. if seized in open position (no brakes) try removing hub from axle....if seized closed (applied) spray a lil wd 40 in brake adj hole in rear of backing plate on brakes hardware only try not to get on shoes. wipe excess from shoes as soon as possible spray w/carb cieaner wipe till no oily spots on brakes. you will find costly repairs inside either way if corrosion has gotten so bad to pit alluminum maybe replace atv b cheaper.
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