brake piston question

[vardenafil]

I have a question for you guys. I have a 2014 4runner. I replaced my brake pads and rotors today. I was able to easily push in the pistons on the caliper with an clamp to make room for the new pads. while doing so I noticed 2 of the rubber boots were torn on one side of the caliper, so i bought a brake repair kit. When i went to press the brakes to get the pistons to stick out just a bit so they weren't flush so i can get the new boot on... I noticed only one piston would move. it was the piston closest to were the brake line went into the caliper. the other 3 pistons did not move. is this normal? or did i some how seize the other pistons? the car brakes normal. doesnt pull or shudder when braking. the brakes however do feel spongy and lack braking power. but this could be due to the new pads and rotors not being bed in yet. I did not break open the bleeder so i know there is no air introduced into the system. should i try clamping one side at a time to see if i can force the pistons to move? or do i need to just replace or rebuild the caliper?

 

[TechWrench]

I have a question for you guys. I have a 2014 4runner. I replaced my brake pads and rotors today. I was able to easily push in the pistons on the caliper with an clamp to make room for the new pads. while doing so I noticed 2 of the rubber boots were torn on one side of the caliper, so i bought a brake repair kit. When i went to press the brakes to get the pistons to stick out just a bit so they weren't flush so i can get the new boot on... I noticed only one piston would move. it was the piston closest to were the brake line went into the caliper. the other 3 pistons did not move. is this normal? or did i some how seize the other pistons? the car brakes normal. doesnt pull or shudder when braking. the brakes however do feel spongy and lack braking power. but this could be due to the new pads and rotors not being bed in yet. I did not break open the bleeder so i know there is no air introduced into the system. should i try clamping one side at a time to see if i can force the pistons to move? or do i need to just replace or rebuild the caliper?

It's simple fluid flow. The fluid will flow to the easiest point. So, the piston that moves is the easiest point for the fluid pressure to move. Until that piston is held in place, the others won't move. So, use clamps on three of the pistons, and replace the boot on the 4th. Move a clamp to the repaired piston, push it back in, and work on the next, and so on until all four are done.

 

[vardenafil]

Thank you. Thank you. Thank you. You saved me at least 150 dollars. I took everything apart and cleaned it real well with brake cleaner and bled everything. Pedal is strong now.

 

[TechWrench]

Thank you. Thank you. Thank you. You saved me at least 150 dollars. I took everything apart and cleaned it real well with brake cleaner and bled everything. Pedal is strong now.

Glad I could help.

 

[4RnnrHntr]

I had this issue today but one of the pistons would not reset at all. Do I have a seized piston, do I need new calipers??

 

[TechWrench]

I had this issue today but one of the pistons would not reset at all. Do I have a seized piston, do I need new calipers??

Most likely, unless you feel confident in trying to rebuild the old ones.

 

[Yort93]

This thread has. Help.me a bit