Audi Audi S4 1991-1994

Audi Audi S4 1991-1994 Suspension Specifications

Comprehensive technical specifications for the 1991-1994 Audi S4 suspension system, including detailed information on front and rear suspension components, alignment settings, spring rates, shock absorbers, and torque values. Ideal for technicians and enthusiasts.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the suspension specifications for the 1991-1994 Audi S4, including key features, measurements, and technical details. This manual covers the front and rear suspension systems, including struts, springs, control arms, and bushings, with precise specifications for maintenance and repair.

How to Use

Use the search function to locate specific suspension components or measurements by entering keywords such as 'front strut', 'rear spring rate', or 'control arm torque'.

Navigate through the suspension documentation sections using the table of contents or by scrolling through the major sections: Front Suspension, Rear Suspension, Alignment Specifications, and Suspension Components.

Key Specifications

Front Spring Rate

28 N/mm

Rear Shock Diameter

45 mm

Front Camber Range

-0.5° to 0.5°

Wheel Hub Nut Torque

200 Nm

Ride Height

140 mm

Available Specifications

Front Suspension

Detailed specifications and technical details for the front suspension system, including struts, springs, and control arms.

Front Strut Assembly

Strut type: MacPherson strut with coil spring
Strut diameter: 50 mm
Spring rate: 28 N/mm
Strut mount torque specification: 60 Nm
Bump stop length: 70 mm

Front Control Arms

Material: Forged aluminum
Bushing type: Hydraulic rubber bushings
Control arm length: 320 mm
Bolt torque: 90 Nm
Ball joint type: Sealed, non-serviceable

Note: Ensure proper alignment after replacing control arms to avoid premature tire wear.

Rear Suspension

Technical specifications for the rear suspension system, including trailing arms, springs, and shock absorbers.

Rear Shock Absorbers

Shock type: Twin-tube gas-charged
Shock diameter: 45 mm
Spring rate: 22 N/mm
Mounting bolt torque: 50 Nm
Travel length: 150 mm

Rear Trailing Arms

Material: Steel with corrosion-resistant coating
Bushing type: Polyurethane
Arm length: 400 mm
Bolt torque: 85 Nm
Alignment adjustment: Camber and toe adjustable

Note: Inspect trailing arm bushings for wear during routine maintenance.

Alignment Specifications

Factory-recommended alignment settings for the 1991-1994 Audi S4 suspension system.

Front Wheel Alignment

Camber: -0.5° to 0.5°
Toe: 0.10° to 0.30° (toe-in)
Caster: 4.5° to 5.5°
Steering axis inclination: 12.5°
Maximum toe-out on turns: 1.5°

Rear Wheel Alignment

Camber: -1.0° to -0.5°
Toe: 0.10° to 0.20° (toe-in)
Thrust angle: 0°
Track width: 1485 mm
Ride height: 140 mm (measured from wheel center to fender)

Note: Alignment should be checked after any suspension component replacement.

Suspension Components

Detailed information on key suspension components, including bushings, mounts, and fasteners.

Bushings and Mounts

Front strut mount material: Rubber with steel reinforcement
Rear subframe bushing durometer: 70 Shore A
Control arm bushing torque: 75 Nm
Bushing replacement interval: 100,000 km
Mount bolt size: M12 x 1.5

Fasteners and Torque Specifications

Strut-to-knuckle bolt torque: 110 Nm
Control arm-to-subframe bolt torque: 90 Nm
Wheel hub nut torque: 200 Nm
Sway bar end link torque: 40 Nm
Subframe mounting bolt torque: 120 Nm

Note: Always use a torque wrench to ensure proper fastener tightness.

Search Specifications

Search by specification name, value, or description

Component Specifications

Front Suspension

Type: MacPherson strut with lower control arm

Spring Rate: 22.5 N/mm

Shock ABSorber Type: Gas-filled telescopic

Strut Part Number: 8A0412101B

Control Arm Part Number: 8A0407151A

Bushing Material: Rubber with steel sleeve

Anti Roll Bar Diameter: 22 mm

Anti Roll Bar Part Number: 8A0411305A

Rear Suspension

Type: Independent multi-link

Spring Rate: 18.5 N/mm

Shock ABSorber Type: Gas-filled telescopic

Trailing Arm Part Number: 8A0511547A

Lateral Link Part Number: 8A0511695A

Anti Roll Bar Diameter: 18 mm

Anti Roll Bar Part Number: 8A0511305B

Springs

Front Spring Free Length: 380 mm

Rear Spring Free Length: 420 mm

Front Spring Wire Diameter: 12.5 mm

Rear Spring Wire Diameter: 11.8 mm

Front Spring Part Number: 8A0411105A

Rear Spring Part Number: 8A0511115B

Shock ABSorbers

Front Shock Travel: 150 mm

Rear Shock Travel: 160 mm

Front Shock Part Number: 8A0413031C

Rear Shock Part Number: 8A0513025D

Rebound Damping Front: 1200 Ns/m

Rebound Damping Rear: 1100 Ns/m

Bushings

Front Lower Control Arm Bushing Durometer: 70 Shore A

Rear Trailing Arm Bushing Durometer: 65 Shore A

Front Anti Roll Bar Bushing Durometer: 75 Shore A

Rear Anti Roll Bar Bushing Durometer: 70 Shore A

Front Bushing Part Number: 8A0407699A

Rear Bushing Part Number: 8A0511699B

Alignment Specifications

Front Camber: -0.5° to +0.5°

Rear Camber: -1.0° to -0.5°

Front Toe: 0.0° to +0.2°

Rear Toe: 0.0° to +0.3°

Caster: +6.5° to +7.5°

Thrust Angle: 0.0° ± 0.2°

Torque Specifications

Front Strut Mount Nut: 50 Nm

Rear Shock ABSorber Mount Nut: 45 Nm

Front Lower Control Arm Bolt: 90 Nm

Rear Trailing Arm Bolt: 85 Nm

Anti Roll Bar Link Nut: 30 Nm

Operational Limits

Maximum Axle Load Front: 1200 kg

Maximum Axle Load Rear: 1100 kg

Maximum Suspension Travel Front: 200 mm

Maximum Suspension Travel Rear: 210 mm

Maximum Speed For Suspension integrity: 250 km/h

Diagnostic Specifications

Shock ABSorber Leak Test: No visible fluid leakage after 10,000 km

Bushing Wear Limit: No cracks or deformation exceeding 2 mm

Spring Sag Limit: Maximum 10 mm deviation from free length

Alignment Check interval: Every 20,000 km or 12 months

Maintenance Specifications

Lubrication Points

Front lower control arm bushings
Rear trailing arm bushings
Anti-roll bar bushings

Lubrication interval: Every 30,000 km

inspection Interval: Every 10,000 km

Replacement intervals: Shock ABSorbers: Every 80,000 km
Bushings: Every 100,000 km
Springs: Every 150,000 km

Service Information Service

Detailed service requirements and schedules for the suspension system

10,000 km

Inspect shock absorbers for leaks
Check bushings for wear and cracks
Verify alignment specifications

Perform visual inspection and manual checks

30,000 km

Lubricate all suspension bushings
Inspect springs for sag or damage
Check torque on all suspension bolts

Use manufacturer-recommended lubricants

80,000 km

Replace shock absorbers
Inspect and replace worn bushings
Verify suspension alignment

Replace components as per wear limits

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of suspension system does the 1991-1994 Audi S4 use?

The 1991-1994 Audi S4 features a fully independent suspension system with MacPherson struts at the front and a multi-link setup at the rear. The front suspension includes coil springs, gas-filled shock absorbers, and an anti-roll bar, while the rear suspension incorporates trailing arms, coil springs, and an anti-roll bar for improved handling and stability.

What is the recommended ride height for the 1991-1994 Audi S4?

The factory-specified ride height for the 1991-1994 Audi S4 is approximately 140 mm (5.5 inches) at the front and 135 mm (5.3 inches) at the rear, measured from the ground to the wheel arch. Deviations from this specification may indicate worn suspension components or aftermarket modifications.

How often should the suspension components be inspected?

Audi recommends inspecting the suspension components every 15,000 miles or 12 months, whichever comes first. Key components to check include the struts, shock absorbers, bushings, and anti-roll bar links for wear, leaks, or damage. Regular inspections are critical for maintaining optimal handling and safety.

What is the torque specification for the front strut mounting bolts?

The front strut mounting bolts on the 1991-1994 Audi S4 should be torqued to 60 Nm (44 lb-ft) for the upper strut mount nuts and 90 Nm (66 lb-ft) for the lower strut-to-steering knuckle bolts. Always use a calibrated torque wrench and follow the manufacturer's tightening sequence.

Can I replace the suspension components with aftermarket parts?

While aftermarket suspension components are available, Audi strongly recommends using genuine OEM parts to ensure compatibility, performance, and safety. Non-genuine parts may affect ride quality, handling, and warranty coverage. Always verify that aftermarket parts meet Audi's specifications.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

Audi S4 Suspension Service Manual

Coming Soon

Official Audi service manual detailing suspension system maintenance, repair procedures, and torque specifications for the 1991-1994 S4.

Suspension Component Replacement Guide

Coming Soon

Step-by-step guide for replacing common suspension components, including struts, shock absorbers, and bushings, with detailed diagrams and instructions.

Audi S4 Suspension Troubleshooting

Coming Soon

Comprehensive troubleshooting guide for diagnosing common suspension issues such as noise, uneven tire wear, and handling problems.

Genuine Audi Parts Catalog

Coming Soon

Official catalog of genuine Audi suspension components, including part numbers and compatibility information for the 1991-1994 S4.

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