How to disconnect the vacuum pump from the cylinder head on Audi 90?

Disconnect the spark plug HT leads and the crankcase ventilation hose as necessary for access to the vacuum pump, located on the left-hand side of the cylinder head. Unscrew the union bolt and detach the vacuum hose union from the pump, recovering the sealing washers. Unscrew the two nuts and withdraw the vacuum pump from the cylinder head, recovering the seal. Remove the plunger from the vacuum pump and clean the contact faces of the pump and cylinder head. Refitting is a reversal of removal, ensuring to fit a new seal and union washers.

Genuine Audi 90 Vacuum Pump

Vacuum Pressure Pump

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4 Vacuum Pumps found

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Audi 90 Vacuum Pump Part Number: 4B0-907-325
$185.64 MSRP: $260.00
You Save: $74.36 (29%)
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Product Specifications
- Replaces: 811-907-325
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1993-1995 Audi 90 | Base, CS, S, Sport | 6 Cyl 2.8 L GAS
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Audi 90 Vacuum Pump Part Number: 4A0-862-257-H
$238.00 MSRP: $333.33
You Save: $95.33 (29%)
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Product Specifications
- Other Name: Pump; Vacuum Pump
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1993-1995 Audi 90 | Base, CS, S, Sport | 6 Cyl 2.8 L GAS
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Audi 90 Control Module Part Number: 4A0-862-257-J
$912.73 MSRP: $1180.00
You Save: $267.27 (23%)
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Product Specifications
- Other Name: Pump; Control Module
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1995 Audi 90 | Base, Sport | 6 Cyl 2.8 L GAS
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Audi 90 Vacuum Pump Part Number: 8L0-862-257-N
$921.86 MSRP: $1191.80
You Save: $269.94 (23%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Pump; Vacuum Pump
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1988-1991 Audi 90 | Base | 4 Cyl 2.0 L GAS, 5 Cyl 2.3 L GAS

Audi 90 Vacuum Pump

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Audi 90 Vacuum Pump Parts and Q&A

Vacuum Pump
4B0-907-325
Q: How to disconnect the vacuum pump from the cylinder head on Audi 90?
A:
Disconnect the spark plug HT leads and the crankcase ventilation hose as necessary for access to the vacuum pump, located on the left-hand side of the cylinder head. Unscrew the union bolt and detach the vacuum hose union from the pump, recovering the sealing washers. Unscrew the two nuts and withdraw the vacuum pump from the cylinder head, recovering the seal. Remove the plunger from the vacuum pump and clean the contact faces of the pump and cylinder head. Refitting is a reversal of removal, ensuring to fit a new seal and union washers.