[Tavis]

TRX400ex brake problem

the piston in my rear brakes will not go in all the way, ive pryed between the old pads and no luck. any suggestions??

 

[Redracer]

Welcome to the site, does it move at all, either way?

 

[Tavis]

not at all

 

[Redracer]

That means the caliper is siezed. As far as I know it needs to be replaced. Although you might be able to find a rebuild kit.

 

[Tavis]

is that something i did while changeing pads because the brake worked fine before i took the old pads out? thanks

 

[Redracer]

HMMMM, that is a whole something different. So the piston worked correctly up until the time you removed the old pads???

 

[Tavis]

i just put the old brakes back in and as far as operation goes they work. the pistion will not retrack far enough for the new pads. would the adjuster bolt have anything to do with it, i thought that was just for the parking brake.

 

[jcupp83]

i just put the old brakes back in and as far as operation goes they work. the pistion will not retrack far enough for the new pads. would the adjuster bolt have anything to do with it, i thought that was just for the parking brake.

yes you will have to back out the bolt for the parking brake and if that don't work try loosing the bleeder valve on the caliper

 

[jgar]

Use a C clamp and pres the piston back in.
I have bought cheap pads off of ebay and they were to thick. I had to sand them down a little with a belt sander.

 

[Helmut]

I agree ^^^^^^^^^. That adjusting bolt for the parking brake will keep it from going all the way in. Loosen the adjusting bolt and use a c-clamp to press the piston all the way in.

 

[DAN400ex]

Also craftsman makes a tool for car break calipers that pushes the caliper back to where its starting point is. My friend and I just recently replaced his rear breaks on an 04 400ex and it was a real pain! I took us everything we had to push the caliper back, but anyways the craftsman tool looked like it would work very well, and should work with an atv. Try that if you would like.

 

[Helmut]

Also craftsman makes a tool for car break calipers that pushes the caliper back to where its starting point is. My friend and I just recently replaced his rear breaks on an 04 400ex and it was a real pain! I took us everything we had to push the caliper back, but anyways the craftsman tool looked like it would work very well, and should work with an atv. Try that if you would like.

A lot of other companies make those too. You can buy those at just about any auto parts store. I have one. I don't think they work any better than a c-clamp does, but they're a little easier to handle and work with.

If the piston is real hard to push back, loosen the bleeder screw, but don't forget to tighten it back as soon as you get the piston pushed back or you will get air in the system.