Yamaha ATV caliper trouble

[milkloss]

We've had several Yamaha grizzly quads over the years. One thing that always bothers me is shite calipers on the brakes.

Latest one that I'm looking for advice on is seized sliders and whether they can ever be relubed or not bother and just replace.

I can't even get one apart at the minute so any tips appreciated.

 

[Tony1989]

What model and year is it?

 

[milkloss]

This ones a 2015 grizzly 550, I might be out on the year but the brakes are the same on a few other yam models.

 

[Tony1989]

Is it the front callipers your having trouble with?

 

[milkloss]

No, the rears. It’s a second hand bike and the brakes are binding on the back, you have to dab the brakes to change gear on the ultramatic.
I’ve only started stripping one and the first challenge will be removing the penny cap over the pin that holds the pads in....... drilled those out on previous bikes and still have spares. The problem is the sliders are seized and won’t let the pads back off. One slider pin is in a rubber hole (I think) so should be ok but the other slides in the ally calliper itself and is pretty well seized. Can get a minor amount of movement when I clamp it hard and have soaked it in WD but I don’t like doing that really as it’s not a lubricant and will swell the rubber boots covering the slider. I do have some proper red grease but obv no use at the minute and also some alu ease grease (no electrolytic behaviour) for all the ally to steel connections.
I think heat might shag the caliper and I’ll end up buying a new one anyway.

 

[box]

Can you put up a photo of the caliper? I've just done the brakes on my 2008 Grizzly 400 (IRS), but it only has one caliper on the rear so might be a bit different to yours. All the pistons and slides were a bit gammy, front and rear.

The rear caliper was a bit of a battle, the piston was stuck and so was the slide. The slide bolt (with the hex head) slides inside a steel sleeve which is pressed and crimped into the caliper. My bolt was seized into the sleeve, I ended up pressing the whole lot out of the caliper, getting the sleeve off the bolt and then pressing the sleeve back into the caliper, re-crimping it and then reaming it so the slide would....slide. So far it's working well and it cost me nothing, but I don't have much faith in it lasting. Realistically, my 400 is past the end of its life so if my repair goes wrong, I'll remove the rear brakes completely.

If you plan to keep the bike for a while, just get another caliper. Not cheap though.

Do the newer Grizzly's still have that stupid foot brake setup with the rear brake master cylinder and mechanism down by the front wheel that ends up covered in sh!t?

 

[Tony1989]

Sometimes you will never get them free and if you do they will be back the same in no time. I’m pretty sure we sell these non genuine, Yam ones will be a hell of a price!

 

[startinghandle]

There are firms that recondition calipers for cars perhaps they also do quads