Have changed master cyl. brake booster,rear calipers all four brake hoses.i have tested ALBLconnector resistance to dash unit
U1900
CAN Communication Bus Fault
Vehicle Security Module
REFER to Section 418-00 .
U1900
CAN Communication Bus Fault
4WD Control Module
REFER to Section 418-00 .
U1900
CAN Communication Bus Fault-Recieve Error
Parking Aid Module
REFER to Section 418-00 .
U1900
CAN Communication Bus Fault-Recieve Error
DSM
REFER to Section 418-00 .
U1900
CAN Communication Bus Fault-Recieve Error
Instrument Cluster
If the 4X4 light is not flashing at key ON, REFER to Section 418-00 .
If the 4X4 light is flashing at key ON, REFER to Section 308-07A .
U1900
CAN Communication Bus Fault-Recieve Error
Power Liftgate Module
REFER to Section 418-00 .
U1900
CAN Communication Bus Fault-Recieve Error
Stability Assist Module
REFER to Section 418-00 .
U1900
CAN Communication Bus Fault-Recieve Error
Air Suspension Module
REFER to Section 418-00 .
which module won't communicate ? need a up scale scanner to communicate with all the modules on the vehicle. Do you know what C.A.N - controller area network is ? Serial data bus (network) All the modules on the vehicle share data on the network . U code's indicate a problem with the network .
SOURCE: 96 ford e350, brake pedal goes to the floor when running
Check for fluid leaks, possibly rear brake cylinders. has anything else been replaced prior to this concern?
SOURCE: Rear brakes on 2005 ford 500
On my Chevy, I use a prybar between the rotor and the caliper to retract it a little, once it's off, I use a 6-in. C-clamp to fully retract it.
Make sure the reservoir doesn't overflow!
SOURCE: BRAKE BOOSTER?
A bad brake booster will result in a hard brake pedal, stiff and more effort required to stop the truck. Here are my questions to you, first, you said you replaced the master cylinder, did you bench bleed it before you installed it? If not, there IS still air in it, regardless of how much you bleed the brakes at the wheels. Second, when you bled the brakes, after changing the calipers and master cyl., did you also bleed the proportioning valve? Sometimes air can get trapped in the valve, and its almost impossible to get it out bleeding just the wheels. And lastly, when the brake light comes on, does the abs light also come on with it? Air can also get trapped in the abs control module too.
SOURCE: brakes dont work, changed master cylinder,
check for air in the lines ..bleed the air out in this tire order LR, RF, RR, LF, i hope u bleed the master cylinder ..che if the bacuum to the booster is good
SOURCE: 99 ford explorer brake pedal goes to floor.
Not likely that the booster is an issue. The booster would not be able to overcome the brake fluid compression.
First open and inspect all brakes for leaks, adjustment, etc. Check all brake lines.
So if no leaks, did the fluid go low in the MC? If so, pad consumption would eat more than a MC reservoir of fluid, and not require MC replacement, but rebleeding and top up of fluid. If the pads are worn, and you replace them, often this will expel air back through the MC.
If you determine the MC is faulty, bench bleed the new one before install, or you will have lots of problems getting air out....
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