C0136 critical

ABS Base Brake System Pressure Circuit Low

The C0136 code means the vehicle's onboard diagnostic system has detected: ABS Base Brake System Pressure Circuit Low. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $50 - $800 (parts and labor)

Read ABS Codes

BlueDriver Bluetooth Pro Scanner

Basic scanners cannot read ABS codes. BlueDriver reads all systems including ABS, SRS, and transmission through your phone.

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Read ABS Codes

LAUNCH CRP123X (Reads ABS + Chassis)

Basic scanners cannot read ABS codes. This one reads all four systems so you know exactly which sensor failed.

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Common Symptoms

ABS warning light on
Brake warning light on
Low brake pedal
Increased stopping distance
Soft or spongy brake pedal feel

Probable Causes (Ranked by Likelihood)

Low brake fluid level Very High
Brake fluid leak in the system High
Worn brake pads causing caliper overextension Moderate
Master cylinder internal failure Moderate
ABS pressure sensor malfunction Low

Step-by-Step Diagnostic Procedure

Check brake fluid level in the master cylinder reservoir immediately
Inspect all brake lines, hoses, and calipers for fluid leaks
Check brake pad thickness on all four wheels
Test master cylinder by holding firm pedal pressure -- pedal should not sink
Monitor ABS pressure sensor data with a scan tool during brake application

Frequently Asked Questions

Is C0136 dangerous?

Yes. This code indicates low brake pressure, which directly affects your ability to stop the vehicle. Do not drive until the cause is identified and repaired. Have the vehicle towed to a repair shop if necessary.

Can worn brake pads cause low brake pressure?

Indirectly, yes. Severely worn pads cause the caliper pistons to extend further, drawing more fluid from the reservoir. If the fluid drops low enough, air can enter the system, causing low pressure.

How do I check for a brake fluid leak?

Visually inspect each wheel for wet spots around the calipers and hoses. Look under the vehicle along the brake lines for drips. Check the master cylinder area for fluid seepage. A UV dye can be added to the fluid to make small leaks easier to find.