2008 chevrolet trailblazer

DTC C0136: Base Brake System Pressure Circuit
The electronic brake control module (EBCM) monitors an internal input from the master cylinder pressure sensor to enhance antilock brake system (ABS) braking and vehicle stability if equipped.

Conditions for Setting the DTC
• When vehicle speed is more than 7 km/h (4 mph), the master cylinder pressure does not change for 30 seconds with the brake applied.
• When vehicle speed is more than 10 km/h (6 mph), the master cylinder pressure signal is erratic.
• Master cylinder pressure signal is out of range.
• Master cylinder pressure is high for 5 seconds with the stop lamp switch signal OFF.

Action Taken When the DTC Sets
• The EBCM disables traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
• A DIC message and/or a warning indicator may be displayed.

Diagnostic Aids
The master cylinder pressure sensor is located internally in the Master Cylinder and is not serviceable.

Circuit/System Verification
Important: It is recommend that the defective components be replaced, and not the complete brake master cylinder assembly.
Verify that DTCs C0131, P0719, P0724 are not set.
? If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.
Replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM and BPMV replacement, setup, and programming

Your best bet , take it to a qualified repair shop.

Start with checking the brake fluid level in the master cylinder. If you're still having an issue it will need to be diagnosed with a scan tool.

DTC C0131
Antilock Brake System (ABS) Pressure Circuit.

• The braking system is not performing an antilock or traction control event.
• The 2 master cylinder pressure sensors do not correlate.

Chevrolet TrailBlazer - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Chevrolet_TrailBlazer
WikipediaProduction of the Blazer overlapped with the TrailBlazer until 2005, when the 2-door ...2006-2008 Chevrolet TrailBlazer LT ... The Active Fuel Management system on the V8 engine shuts off 4 of the 8 ... 2003-2005 Chevrolet TrailBlazer EXT.

Trailblazer cranks but won't start - first things to check ...

? 3:42
www.youtube.com/watch?v=4O-wplilVV0

Mar 6, 2012 - Uploaded by MAY03LT
These are the first tests that I do when I have a Trailblazer that won't start. ... Car will not start trouble shooting guide, wontcrank, wont turn over, etc. ... Chevy Trailblazer - testing fuel pressure 2002 -2004 4.2 I6 - Duration: 4:34.

Check the flexible brake lines on the front two wheels. The rubber inside can become swollen which will restrict the release of pressure when you let off the brakes. After a few brake applications, enough pressure will build up to keep the brakes applies to the front two wheels. It will also severely wear the front pads .

check the clearance of the brake pedal rod into the master cylinder. Should be about 1" movement before the rod moves the piston .
The master cylinder has a blockage in the compensating ports so replace the master cylinder. As the brake oil is heating from brake application, it is not getting back to the reservoir so it is pressing the pads back onto the rotors which is heating the oil even more.

If the ! symbol you saw is inside a circle enclosed in parentheses like (O), and usually red in color, that's for your brake fluid. Check it out, maybe its low on fluid. If it is, check for fluid leaks or worn brakepads. Usually the ! symbol coincides with the P symbol and also red in color. When the park brake is engaged, both these symbols appear together. If you release the park brake, both indicators should turn off under normal conditions, otherwise either of the two or both will stay on when there is insufficient fluid or there's a parking brake circuit fault. Brakes are very important, so give proper attention and solution if ever these indicators lightb up when they shoud not.
If the ! symbol is very bold and inside a half drawn flat tire, and yellow in color, thats the tire pressure monitor indicator. Check and balance all four tire pressures to the correct specification.
Okay, sir? have a safe trip. : )

A yellow explanation point symbol on the dashboard typically applies to the Tire Pressure Monitoring system. A thick ! inside a half drawn flat tire symbol to be complete and comes in yellow color when lit. Under normal vehicle set-up, if this indicator stays lit after the power-on selftest, you need to check your tires for any uneven pressures and adjust their pressures to correct specifications. Okay? : )

A red exclamation point inside a circle when lit indicates your parking brake is on, or your brake fluid level is low.

sounds like your tire pressure sensors are iffy. just my input...any other sensors come on? like your tire pressure ones? if not, try and add a tiny bit of air in each tire until its dead on the recommended pressure, then check to see if the light has went off...hope im right on this one lol

My 03 trailblazer does the same thing and the service dept. told me that it was normal for this model to do that, it has never failed to stop but if your sitting at a red light you can feel the peddle go down to almost the floor but it stops fine and it has done this since day 1 and they say thats normal on the trailblazer.