Gone to change break pads today as yesterday I found out that I should probably change my break fluid so while I was at it thought I may as well change my pads as well since I was going to do the fluid change over .... been Friday i had my younger brother with me helping me and i asked him to change the radio station and he put his foot onto the brake while I had the caliper off and one of the pistons came out (i have no idea why it came out all the way... as that has never happened before and I would think the slightest touch of the break pedal shouldnt have much such an effect) anyway.. My guess i going to be.. no real issue here just need to put the piston back in and use a gclamp to push it back? My concern is that wouldn't it push alot of air back up the brake line? Should I change the rest of the brake pads now and worry about bleeding it at the end or should i bleed it now and then do the pads and should will it be okay to just force the piston back in even though it has come all the way out, oh and btw when it came out.. alot of brake fluid dispersed along with it this was the passenger front side too. thanks
You might as well let all the fluid drain out since you are going to change it anyway. The piston should go back in easy without the fluid, no G clamp should be necessary. Bleed it after you've changed all the pads starting with the longest brake line first, then work your way to the shortest.
i would assume by longest... passenger rear, driver rear, passenger front and then drivers front then?
When you push the piston back, undo the bleed nipple on the caliper to release the air. Also, ensure your hands are perfectly clean and have no mineral oil or dirt on them that will contaminate the piston rubber 'o' ring. Wash in metholated spirit any parts that need cleaning. The sequence is as you have determined above!
its normal for the piston to come out if you push the brake pedal while the pads are out. If you ever want to change the seals in the callpier, this is the easiest way to get the piston out. Which pads did you use ?
