nope...when I find out so will everyone else.

 

Since you describe all 4 wheels dragging, I also vote for a master cylinder problem. Had similar problem with my 85 200sx, changed MC and all back to normal.

 

things took a different turn today.
short 2km trip; all normal. 2hs later went out for short drive and the brakes were dragging again and hot again...this time the abs and stability control lights came on. Will pull codes when I get to work Monday.


kinda what to uplug the ebcm and see what happens but will wait till I pull codes first.

 

the dtc set in the ebcm was c0132 pressurized circuit range performance, At the moment the system is working normally and the dtc is stored in history.
As per usually module diagnostics, it wants the integrity of the wires and reference voltages checked, if all are good...replace ebcm. I will monitor the system this week and do some testing this weekend.

if it needs a ebcm...are all trim lines ebcm's the same. I thought gtp comp g versions had different programming for the esc system. Can anyone confirm this?

the brake build options appear to be:
-jl4 control active brake
-nw7 traction control power management only
-nw9electronic traction control

I have jl4. Is it safe to assume I can use any boneyard ebcm with the jl4 option regardless of trim level? I doubt i'll find a donor gtp in the boneyard but many na cars.

 

problems continue with the same dtc setting. I have pulled every abs, etc fuse and will monitor until Saturday.

 

drove all week with all 3 fuses for the abs/ebcm removed. the problem still occurred. I decided to ignore the dtc diag and perform a mechanical inspection first.


so today, I drove for about 10 minutes until I could feel the problem occur and then went into the shop and raised the vehicle on the hoist.

the brake temps at each rotor where:
L/F 160*C R/F 113*C
L/R 73*C R/R 94*C

with the trans is neutral, tried to spin each tire by hand and the both front were not moveable, both rear could be moved but were dragging hard.

pull the check valve out of the booster and all wheels spun. plugged the hose back into the booster and attempted to perform the same test again. this time the l/f was the only tire that would not spin normally.

pulled the both front tires and unbolted the front calipers from the caliper brackets. the left caliper appears to have been replaced previously (all 4 calipers are not painted red...it should have red calipers from factory).



the right piston pushed back normally, the left would not push back. cracked the bleeder and the left pushed back normally. I have ordered a l/f flex hose for next week. I may have more than one problem but will start at the flex hose.

 

Good job tech2 ! That kind of post/report is really valuable ! I understand there's still work to be done, but again GOOD JOB !

 

thanks SWHouston. just trying to gather some evidence that points to a failed part. I will put the new part on next Saturday and report back.

 

Just think how valuable this forum would be if everyone took the time to do it this way!

 

the results are in..................and.........its not fixed


put the l/f flex line on and the l/f wheel is still dragging. I am not addressing the 4 wheel drag until I get the l/f fixed as this problem is there all the time.


sheesh, the car uses another flex hose before the one at the caliper. this 2 foot line has 1 rubber flex line and 1 steel braided line.
I decided to go right back to the ebcm and crack the brake line out of the ebcm. cracked the line...pressure spurt of fluid and the wheel spun freely.


...would have been a good thing to do the first time...ah well, the new flex line is nice and shiny and the $21 purchase is good for the economy.


In my near future I foresee a trip to pick and pull to get a used ebcm/bpmv assembly. probably should get 1 of everything while i'm there.