Sons 2002 Big Bear 400 4x4 has not had rear/ parking brakes since we have had it. I got new brake shoes for the rear drum. Have it all pulled apart now. The issue is the camshaft (part 5fu-f5351-00-00) will not turn. I have sprayed quite a bit of anti-seize on it and have been able to turn it a bit with a wrench. There is now way it would turn just applying the foot or hand brakes and even if it did, it would not return back. Two questions: can I just drive the camshaft out? I have tapped on it a bit trying to drive it out but it has not budged. Did not want to use too much pressure. Would applying some heat help? The other question is do you know where I can find the full replacement part if I cannot get the camshaft out? No one including ebay seems to have part# 5fu-f5321-10-00 It is part # 16 on the rear wheel diagram. Thanks!

 

Yamaha seemed to come up with totally different rear brake systems every couple of years, so difficult to be exact, but as far as I know the pin/camshaft can just be driven out once the shoes are removed. The main thing is to hit it with a drift smaller than the pin, and only hit it in the centre as, if you mushroom the splines, you won't get the lever back on. Hondas and Suzuki Eigers have the same set up and the same problems, and I do these every day using a 4 pound lump hammer, they are that tight. Clean the pin up with emmery and clean the bore in the backplate out if you can. Once it is running freely, grease it and re-fit.

 

Thanks for the reply and the reminder on the mushrooming. I could see how that could easily occur. I will give this a shot an hopefully update the progress for future reference.