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.
Disconnect connector from hydraulic unit
1999 Audi A8 QuattroSECTION Disconnect connector from hydraulic unit
- Pull connector housing up enough that connector can be removed.
- Connect bleeder bottle to bleeder screw on left front brake caliper and open bleeder screw.
- Insert brake pedal depressor between brake pedal and driver's seat. Depress brake pedal at least 60 mm.NOTE: This prevents the brake fluid reservoir from emptying.
Do not remove brake pedal depressor until all brake lines have been reconnected. - Close front left bleeder screw.
- Protect engine compartment from escaping brake fluid.
- Disconnect brake line connections at hydraulic control unit.
- Seal brake lines and threaded holes using plugs from repair kit, Part No. 1 H0 698 311 A.
- Remove hex-nuts at hydraulic control unit bracket.
- Remove hydraulic control unit.
WARNING:
Brake lines must not be bent.
RENDER: 1.0x
NO RELATED
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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.