Brake Fluid Loss
WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
| Step |
Action |
Yes |
No |
| DEFINITION: Brake fluid level is low not related to lining wear. |
| 1 |
Were you sent here from the Hydraulic Brake Symptom table? |
Go to Step 2 |
Go to Symptoms - Hydraulic Brakes |
| 2 |
- Inspect the following hydraulic brake system components for brake fluid leaks:
- Flexible brake hose connections; threaded and bolted
- Flexible brake hose crimping joints
- Brake pipe fittings
- Caliper piston seals
- Wheel cylinder piston seals, if equipped
- Master cylinder reservoir
- Master cylinder reservoir low pressure hose, if equipped
- Brake pressure modulator valve (BPMV) assembly, if equipped
- Repair or replace components as necessary. Refer to Hydraulic Brake System Diagnosis .
Did you find and correct a condition? |
Go to Step 5 |
Go to Step 3 |
| 3 |
- Disconnect the vacuum check valve from the booster to relieve vacuum reserve.
- Separate the master cylinder from the vacuum brake booster. Do not disconnect any brake pipes.
- Inspect the rear of the master cylinder for a brake fluid leak.
- Inspect for brake fluid in the vacuum brake booster.
Did you find the brake fluid leak? |
Go to Step 4 |
Go to Symptoms - Hydraulic Brakes |
| 4 |
Replace the brake master cylinder and the vacuum brake booster.
Did you complete the replacement? |
Go to Step 5 |
- |
| 5 |
- Install or connect components that were removed or disconnected during diagnosis.
- Road test the vehicle to confirm proper operation. Refer to Brake System Vehicle Road Test .
Is the condition still present? |
Go to Step 2 |
System OK |