100 Series ABS issues

[wagonwheeler1]

Hey! So I have a 100 series here with some braking issues. I start it up and I get these lights: Brake, VSC off, VSC Trac, traction, diff lock. I also get a very high pitch constant beep and occasionally strange sounds from brake booster/accumalator area. I was in reverse a few days ago and the car almost locked up I could barely go backwards. Thought it could be transmission related but thinking it is all brake system related since I ran the codes and came up with 7 ABS codes. I included the codes below. Any help is greatly appreciated. Thank you!

C1223- Antilock brake system control system malfunction

C1241- Power Source Voltage down

C1249- Stop lamp switch circuit

C1252- Hydraulic brake booster pump motor on abnormally long

C1256 - Accumulator low pressure malfunction

C1268- Transfer L4 position switch malfunction

C1340 - center diff lock

 

[Live to Ski]

Total speculation: sounds like a brake booster failure as a minimum.

"search" & ye shall find.

 

[TahoeZ]

Did all of the lights and codes start at the same time? My first guess would be a voltage issue. A number of these systems are very sensitive to correct voltage. Test voltage at the battery and at main connection terminals for brake booster, etc....

 

[excessive]

your brake master accumulator pump has failed.

hello from Charleston

 

[SteveH]

With that many codes, check for rodent-chewed wiring all around the brake booster area, too.