paulrob100 wrote: ......... or the pads are sticking.
Hi Paul,
Disappointed to hear that the sliders being reversed have not sorted the problem.
I do feel, however it is unlikely that the piston itself is sticking unless you noticed a high degree of corrosion on the piston surface or the bore itself.
The other thing I have noticed is that with the rear of the Alp jacked up, although turning the wheel by hand feels quite free, but with the wheel off, there is a certain amount of resistance when turning the disc by hand. To me this is normal. I think this is to do with the hand brake mechanism. It might be worth comparing the resistance between the two back wheels to see if one is tighter thyan the other.
I note your comment about sticking pads ....... There is a possibility of this happening.
If you refer to the pic below .... 88311 ..... the "V" casting running right towards 4 o'clock from bolt 3 .... that should be paint free and clear of any rust .... I usually wire brush it if I remove the pads .... and it should be lightly greased as when the brake is applied, the pads come together sliding towards each other along that "V" section ... so to speak, and return when pressure is released. Obviously the movement is small, but as the pads wear, their contact points move along the section towards each other.
Now pic 88337 ..... The wedge "1" , again this is the lower bearing surface for the pads ... so the same sliding principal applies.
Once again the surfaces that the wedge slides along when installing it, again must be paint and rust free and lightly greased.
When installing the wedge, if everything is clean and greased, you should be able to slide the wedge in by hand ..... you should not have to use a hammer or drift ..... you are looking for a sliding fit not an interference fit. You may have to tap the rear edge of the pads to centralise them when fitting the wedge, If you do have to use something to insert the wedge .... it is too tight.
Effectively between the "V" section at the top, and the wedge at the bottom of the caliper, they are acting in the same way as the sliders which both allow the pads to compress the disc and release. Either of these sticking can cause the pads not to clear the disc properly.
I hope this is of help to you.
1990 GTA Atmo, 2003 Jaguar X type 2.5SE Auto, 2018 Kia Picanto GT-Line-S 1.25