Brake mystery
- Thread starter Juamgv
- Start date
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Charlie207
Full Access Member
Good luck.
The new calipers don't come with new bleeders?
Latest update: I swapped the calipers from left to right and it did work after a couple of bleeding, brakes are good but not 100% to the point. Now I have a permanent ABS light and Stabilitrak on dashboard, and every other run the BRAKE light. I scanned it and it seems to be the module, the code is C0131.
Any ideas what can it be? I am thinking about a new module but don't want to expend hundreds before making sure it is the module.
Any ideas what can it be? I am thinking about a new module but don't want to expend hundreds before making sure it is the module.
do you have JL4 rpo code brakes? my software has different diagnostic for with JL4
either way, looks like c0131 should have a sub code of something like 00 or 3A or 4B. for JL4 others like 7 sub codes for different things related to it and how to troubleshoot them.
after checking you have to correct voltage at the correct pins on the harness plugs, with JL4 if 3a or 4b isn't set, you need to do a specal function, Brake Pressure, Sesnor, Calibration..
the hint givin is if they ecu is loosely attached to the hydraulic unit the c0131 can be set and to check for proper torque.
oh and something about make sure the brake lights are working when you press the brake pedal.
either way, looks like c0131 should have a sub code of something like 00 or 3A or 4B. for JL4 others like 7 sub codes for different things related to it and how to troubleshoot them.
after checking you have to correct voltage at the correct pins on the harness plugs, with JL4 if 3a or 4b isn't set, you need to do a specal function, Brake Pressure, Sesnor, Calibration..
the hint givin is if they ecu is loosely attached to the hydraulic unit the c0131 can be set and to check for proper torque.
oh and something about make sure the brake lights are working when you press the brake pedal.
Dustin Jackson
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@Juamgv It seems like a long shot but maybe you unplugged a wheel speed sensor on accident. I would go reseat all 4 to be sure
If I was trying to solve your issue, I would start with the caliper farthest from the MC, RR, LR, RF, LF in that order.
First, get a bleeder container with soft, flexible hose or similar, these are great from Motive.
Crack both rear bleeder screws if you have two containers, or just use a hose into a can and let them drip for a few min, or start with the RR.
Close the bleeders then begin the bleeding procedure. Try not to fully depress the brake pedal so it reaches the end of travel....use half presses until it tightens up then you can press the pedal fully. This lessens the risk of damage to the MC piston/seals.
Work all the way around and check the pedal travel. If you pumped a bunch of air you will likely need the ABS bleed procedure from the scanner as previously mentioned.
This works great to get the fluid pushed through the system, just add your models reservoir cap to the purchase.
I don't fill the pressure jug but just add to the reservoir.
First, get a bleeder container with soft, flexible hose or similar, these are great from Motive.
Crack both rear bleeder screws if you have two containers, or just use a hose into a can and let them drip for a few min, or start with the RR.
Close the bleeders then begin the bleeding procedure. Try not to fully depress the brake pedal so it reaches the end of travel....use half presses until it tightens up then you can press the pedal fully. This lessens the risk of damage to the MC piston/seals.
Work all the way around and check the pedal travel. If you pumped a bunch of air you will likely need the ABS bleed procedure from the scanner as previously mentioned.
This works great to get the fluid pushed through the system, just add your models reservoir cap to the purchase.
I don't fill the pressure jug but just add to the reservoir.
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Hey guys thank you for your help! I was out of town and couldn't work on it until yesterday.
@j91z28d1 So the code was the actual brake modulator, it has a switch right in the middle(between all the pistons) with 3 pins, 2 out of the 3 were stuck and didn't make contact with the metal part. I got a modulator from the junk yard and programmed it, all good now!
@dkad thanks, the actual issue with the bleeding process was that the front caliper bleeding valves were pointing down and not up, I swap the calipers and everything came came to normal.
NOW I have a new code C0455 steering angle sensor, I am pretty sure it is not the sensor, could it be because I put new shocks and struts? Do you guys now how to recalibrate it on the tech2?
@j91z28d1 So the code was the actual brake modulator, it has a switch right in the middle(between all the pistons) with 3 pins, 2 out of the 3 were stuck and didn't make contact with the metal part. I got a modulator from the junk yard and programmed it, all good now!
@dkad thanks, the actual issue with the bleeding process was that the front caliper bleeding valves were pointing down and not up, I swap the calipers and everything came came to normal.
NOW I have a new code C0455 steering angle sensor, I am pretty sure it is not the sensor, could it be because I put new shocks and struts? Do you guys now how to recalibrate it on the tech2?
