Michigan State Brakes Certification Practice Exam

Which of the following is true about bleeding brake lines on most ABS equipped vehicles?

1. They require special tools to bleed

2. They can be bled like conventional systems

3. They do not require caution due to pressure

4. They cannot be bled at all

The correct answer is: They can be bled like conventional systems

When bleeding brake lines on most ABS equipped vehicles, it's essential to understand that they can be bled similarly to conventional systems, although there are some nuances to consider. The fundamental process of removing air from the brake lines by applying pressure to the brake pedal while opening and closing the bleed screws is consistent with the method used for traditional brake systems. However, technicians must be aware that ABS systems may involve additional steps to ensure that all air is purged from the hydraulic circuits, particularly if the ABS module is involved. The procedure typically includes the possibility of activating the ABS pump or using a diagnostic tool to cycle the ABS valves when air is suspected in the ABS unit, which is a consideration that is more complex than with non-ABS systems. It's critical to refer to a specific vehicle's service manual for complete procedures, yet the basic nature of bleeding—pressurizing the lines and allowing fluid to flow out while minimizing air—remains similar across both system types. This understanding helps differentiate it from the other options which imply limitations or special requirements that don’t align with this core principle of brake fluid bleeding.