I have a bit of a problem. I have a 240 and the front passenger caliper keeps locking up for no reason. I've replaced it with two different calipers, bled the system countless times, replaced the power booster and still continues t lock up. any ideas? I'm not a very technical person as to how things work, just good at taking things apart and putting them back together. any help would be great. thank you.

 

try replacing the rubber brake hose that goes to the caliper

 

it also could be the disk see if the disk is bent in any way or even divided.... as far as the hose goes that wouldnt cause the problem ...... especially if youve replaced the booster..

 

racey what makes u think the brake hose could'nt be the problem because he replaced the booster that makes no sense i have been a nissan tech for ten years i have had to replace the rubber brake hoses quite a few times for the problem he is having never had to replace a rotor for that problem

 

and as i see in your other post for transmission help make my wonder how qualified you are at solving others problems

 

i agree with nissan racey, a hose could cause that problem. i have a datsun 280zx and i have had the same problem. One thing that is good to do when you replace or rebuild your brakes is to go ahead and change all the rubber hoses. You shouldnt have to do this every single time but its always better to be safe then sorry. Also, you should probally check the metal piping that sends the brake fluid to the caliper. The way you would check this is when you undo the metal piping from the rubber flex hose look and see if the fluid comming out is a rust color if it is you should be getting prepared to replace it soon. Okay now to what racey said. His caliper wouldnt have as much to do with his problem as much as the rubber hose. Granted im not a nissan tech but i am a redneck that has rebuilt plenty of motor and i also redo my own brakes as well as my fiances dads. All his caliper would do if it was bent or otherwise known as "warped" would be causeing some vibration when braking.