ABS Brake Scanning | Why Brake Lines Fail During Winter

The ABS controller/modulator is the heart of any ABS or ESC system. ESC systems add software and sensors like yaw, steering angle and even throttle control to keep the vehicle under control.

Testing the unit with a scan tool with bidirectional control might be the best way to confirm the condition of the ABS. 

Why Brake Lines Fail During Winter

In winter, ABS systems work harder to maintain traction, causing pressure pulses that can rupture weak brake lines.

1. Corrosion from road salt and deicing chemicals

While automakers use coatings and barriers to prevent corrosion, road debris and age still contribute to line wear. When a brake line corrodes, simply splicing it won’t work; the best solution is replacing the entire line, particularly from the wheel well.

2. The Way Brake Lines are Manufacture and Installed

Modern cars often have one-piece brake lines installed on the unibody, making repairs complex and costly. Removing the subframe for full replacement is expensive, so tubing can be formed in place or pre-bent tubing can be cut into sections for easier installation.

3.  An Improperly Cut or Poorly Clamped Flare

For ABS-equipped brakes, it’s crucial to properly flare the brake lines. Poorly cut or clamped flares can cause leaks, even if they look fine. The fitting requires precise geometry to withstand the high pressure (2,000 psi) in the system.

4. Without  bleed Air Bubbles in the Brake

When replacing brake lines on ABS vehicles, a scan tool is needed to bleed the system and remove air bubbles from the modulator, especially if the brake fluid has been drained. This tool helps open the modulator valves to ensure proper brake function.

Autel Maxicheck Pro for ABS Brake Auto Bleeding OBD2 Scan Tool with Airbag, EPB, SAS, BMS, Oil Reset Services for Specific Vehicles

Shop Now