Press brake piston into caliper bore?, how to do that? Options

[dangqiwu]

Can't press piston into caliper bore. Any advice?


This post has been edited by dangqiwu: Jan 2, 2013 - 11:35 PM

[Nial]

I dont think you will need any tools, remove the brake pads, press the brake pedal once or twice, enough to push the piston out by a half inch or so, remove the rubber boot, you might need a small flat blade screw driver to wangle the metal spring clip off the outside of the boot. once the boot is removed look at the brake piston, if its nice and clean then you should be able to push it back in, However, corrosion will cause the piston to jam against the seal which is perhaps why it wont go back in. You will need to replace the piston with a new or rust free second hand one, in an ideal world you should change the seal too, but you can sometimes get away with reusing the old one if it has not suffered any damage.

[dangqiwu]

I dont think you will need any tools, remove the brake pads, press the brake pedal once or twice, enough to push the piston out by a half inch or so, remove the rubber boot, you might need a small flat blade screw driver to wangle the metal spring clip off the outside of the boot. once the boot is removed look at the brake piston, if its nice and clean then you should be able to push it back in, However, corrosion will cause the piston to jam against the seal which is perhaps why it wont go back in. You will need to replace the piston with a new or rust free second hand one, in an ideal world you should change the seal too, but you can sometimes get away with reusing the old one if it has not suffered any damage.

The piston looks OK, just several point of rust.

Would it help if I loose the bleeder screw?

Oh I would not do all that. Take out the brake pads(remembering how they go) and just get a c clamp and press the caliper back slowly moving side to side.
Make sure to remove brake resiviour cap because your fluid will rise back up, and put the cap BACK on before pressing the brakes after you are done. Or you will have to bleed brakes.

I tried with a C-Clamp but it's not working...

[xrav22]

I dont think you will need any tools, remove the brake pads, press the brake pedal once or twice, enough to push the piston out by a half inch or so, remove the rubber boot, you might need a small flat blade screw driver to wangle the metal spring clip off the outside of the boot. once the boot is removed look at the brake piston, if its nice and clean then you should be able to push it back in, However, corrosion will cause the piston to jam against the seal which is perhaps why it wont go back in. You will need to replace the piston with a new or rust free second hand one, in an ideal world you should change the seal too, but you can sometimes get away with reusing the old one if it has not suffered any damage.

The piston looks OK, just several point of rust.

Would it help if I loose the bleeder screw?

Oh I would not do all that. Take out the brake pads(remembering how they go) and just get a c clamp and press the caliper back slowly moving side to side.
Make sure to remove brake resiviour cap because your fluid will rise back up, and put the cap BACK on before pressing the brakes after you are done. Or you will have to bleed brakes.

I tried with a C-Clamp but it's not working...

No you can't loosen bleeder screw or you will have to bleed the whole system
just remove the brake filler cap beforehand to let the pressure out.
Just (I am looking at your pic for reference), take out the pads and squeeze the piston back in very slowly with one side of the c clamp on the piston and the other on the back of the brake caliper( area next to brake line connection). It will go back slowly. I have done it 100 times always works. Just make sure to put the cap back on the resivour ( how do you spell that) after you have it all reassembled , before you press the brake pedal.
Good luck.

This post has been edited by xrav22: Dec 22, 2012 - 8:58 PM