Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Anti-lock brake system (ABS) Bosch 5.7: Notes
A traction control system (ASR) may also be installed as an optional extra on front wheel drive vehicles.
The ABS is split diagonally. The brake servo assistance is provided pneumatically by the vacuum brake servo unit.
Hydraulic unit -a- and control unit -b- form a single unit. It is therefore termed the hydraulic control unit.
The direct connection between these components reduces possible sources of malfunctions. There is no provision for repairing the hydraulic control unit - it must be replaced if faulty.
The bolts that connect the individual components of the hydraulic unit must not be slackened.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.