Audi Audi S4 1997-2002 Brakes Specifications
Detailed technical specifications and service information for the 1997-2002 Audi S4 braking system. Includes brake components, torque specs, maintenance, and troubleshooting.
Overview Specifications
Comprehensive description of the brakes specifications for the 1997-2002 Audi S4, including key features, measurements, and technical details. This section covers the braking system's design, components, and performance specifications to ensure optimal functionality and safety.
How to Use
Use the search function to locate specific brake specifications by entering keywords such as 'rotor diameter', 'pad thickness', or 'brake fluid type'. Use exact terms for precise results.
Navigate through the brakes documentation by selecting the relevant section from the table of contents. Each section is organized by component type and includes detailed subsections for specific measurements and technical details.
Key Specifications
Front Rotor Diameter
321 mm
Rear Rotor Diameter
256 mm
Brake Fluid Type
DOT 4
60-0 mph Stopping Distance
120 ft
Master Cylinder Diameter
22.2 mm
Available Specifications
Front Brake System
Detailed information about the front brake system, including rotor and caliper specifications, pad dimensions, and performance characteristics.
Front Brake System
Detailed information about the front brake system, including rotor and caliper specifications, pad dimensions, and performance characteristics.
Front Brake Rotors
- Rotor diameter: 321 mm
- Rotor thickness: 30 mm
- Material: Ventilated cast iron
- Minimum thickness after wear: 28 mm
Front Brake Calipers
- Type: Dual-piston floating caliper
- Caliper material: Aluminum alloy
- Piston diameter: 57 mm
- Brake pad area: 60.2 cm²
Note: Ensure proper alignment of calipers during installation to avoid uneven pad wear.
Rear Brake System
Technical details of the rear brake system, including rotor and caliper specifications, pad dimensions, and performance metrics.
Rear Brake System
Technical details of the rear brake system, including rotor and caliper specifications, pad dimensions, and performance metrics.
Rear Brake Rotors
- Rotor diameter: 256 mm
- Rotor thickness: 22 mm
- Material: Solid cast iron
- Minimum thickness after wear: 20 mm
Rear Brake Calipers
- Type: Single-piston floating caliper
- Caliper material: Aluminum alloy
- Piston diameter: 38 mm
- Brake pad area: 40.5 cm²
Note: Regularly inspect rear calipers for corrosion, especially in high-moisture environments.
Brake Fluid and Hydraulics
Information about the brake fluid type, hydraulic system specifications, and maintenance requirements.
Brake Fluid and Hydraulics
Information about the brake fluid type, hydraulic system specifications, and maintenance requirements.
Brake Fluid Specifications
- Recommended fluid: DOT 4
- Boiling point (dry): 230°C
- Boiling point (wet): 155°C
- Fluid capacity: 1.0 liter
Hydraulic System
- Master cylinder diameter: 22.2 mm
- Brake line pressure: 120 bar
- ABS system: Bosch 5.3
- Brake pedal ratio: 4.2:1
Note: Always use fresh brake fluid when servicing the system to maintain optimal performance.
Brake Performance
Performance metrics and testing data for the braking system, including stopping distances and fade resistance.
Brake Performance
Performance metrics and testing data for the braking system, including stopping distances and fade resistance.
Stopping Distance
- 60-0 mph stopping distance: 120 ft
- 100-0 km/h stopping distance: 36.5 m
- Deceleration rate: 1.1 g
Fade Resistance
- Fade resistance tested at 10 consecutive 100-0 km/h stops
- Maximum temperature reached: 450°C
- Performance drop: <10%
Note: Fade resistance testing conducted under controlled conditions with OEM components.
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Brakes Specifications
Brake System Type
- System
- Hydraulic dual-circuit with diagonal split
- Brake Assist
- Mechanical brake booster
- ABS
- Bosch 5.3 ABS with electronic brake force distribution (EBD)
Front Brakes
- Type
- Ventilated disc brakes
- Rotor Diameter
- 321 mm
- Rotor Thickness
- 30 mm
- Caliper Type
- Fixed 4-piston aluminum caliper
- Pad Material
- Semi-metallic
- Part Number Rotor
- 8D0615301A
- Part Number Pads
- 8D0698151M
Rear Brakes
- Type
- Solid disc brakes
- Rotor Diameter
- 245 mm
- Rotor Thickness
- 10 mm
- Caliper Type
- Floating single-piston caliper
- Pad Material
- Semi-metallic
- Part Number Rotor
- 8D0615601A
- Part Number Pads
- 8D0698451M
Brake Fluid
- Type
- DOT 4
- Capacity
- 1.0 liter
- Specification
- ISO 4925 Class 6
- Replacement interval
- Every 2 years or 30,000 miles
Brake Lines
- Material
- Steel braided with rubber coating
- Front Line Diameter
- 4.75 mm
- Rear Line Diameter
- 4.75 mm
- Part Number Front
- 8D0611751A
- Part Number Rear
- 8D0611752A
Parking Brake
- Type
- Mechanical cable-operated
- Cable Length
- 1800 mm
- Adjustment Type
- Manual
- Part Number Cable
- 8D0611221A
Brake Pedal
- Pedal Ratio
- 4.2:1
- Pedal Travel
- 50-60 mm
- Force Required
- 40-50 N
Brake Booster
- Type
- Vacuum-assisted
- Diameter
- 230 mm
- Part Number
- 8D0612101A
ABS System
- Control Unit
- Bosch 5.3
- Sensor Type
- Active wheel speed sensors
- Part Number Control Unit
- 8E0907379A
- Part Number Sensor
- 8D0927807A
Brake Wear indicators
- Front Pads Wear Limit
- 2 mm
- Rear Pads Wear Limit
- 2 mm
- Warning Type
- Electrical sensor
- Part Number Sensor
- 8D0927807A
Service Information Service
Detailed service requirements and schedules for the 1997-2002 Audi S4 brakes
- Inspect brake pads and rotors for wear
- Check brake fluid level and condition
- Inspect brake lines for leaks or damage
Replace brake fluid every 2 years regardless of mileage
- Replace brake pads if necessary
- Inspect and clean brake calipers
- Check parking brake adjustment
Rotors should be measured for thickness and replaced if below minimum specification
- Replace brake fluid
- Inspect ABS system for faults
- Check brake booster operation
Perform a full brake system inspection including ABS diagnostics
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the brake rotor diameter and thickness for the 1997-2002 Audi S4?
What is the brake rotor diameter and thickness for the 1997-2002 Audi S4?
The front brake rotors have a diameter of 321 mm and a thickness of 30 mm, while the rear brake rotors have a diameter of 256 mm and a thickness of 22 mm. Always measure rotor thickness during service to ensure it meets the minimum specification of 28 mm (front) and 20 mm (rear).
Q2 What type of brake pads are recommended for the Audi S4?
What type of brake pads are recommended for the Audi S4?
The Audi S4 uses semi-metallic or ceramic brake pads. Genuine Audi brake pads are recommended for optimal performance and compatibility. Front pads have a friction material thickness of 14 mm (new), and rear pads have 12 mm (new). Replace pads when the friction material thickness is less than 3 mm.
Q3 What is the recommended brake fluid for the 1997-2002 Audi S4?
What is the recommended brake fluid for the 1997-2002 Audi S4?
The Audi S4 requires DOT 4 brake fluid with a minimum dry boiling point of 500°F (260°C) and a wet boiling point of 356°F (180°C). Audi recommends using genuine Audi brake fluid or an equivalent high-performance fluid meeting VW/Audi specification 501.14.
Q4 How often should the brake system be inspected on the Audi S4?
How often should the brake system be inspected on the Audi S4?
Audi recommends inspecting the brake system every 10,000 miles or annually, whichever comes first. This includes checking pad thickness, rotor condition, brake fluid level, and brake line integrity. Severe driving conditions may require more frequent inspections.
Q5 What is the proper procedure for bleeding the brake system on the Audi S4?
What is the proper procedure for bleeding the brake system on the Audi S4?
The brake system must be bled using a pressure bleeder to avoid air ingress. Follow the sequence: rear right, rear left, front right, front left. Use only DOT 4 brake fluid and ensure the reservoir is kept full during the process to prevent air from entering the system.
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 Brake System Service Manual
Coming SoonOfficial Audi service manual detailing brake system maintenance, repair procedures, and specifications for the 1997-2002 S4.
Brake Pad Replacement Guide
Coming SoonStep-by-step guide for replacing front and rear brake pads on the Audi S4, including torque specifications and safety precautions.
Brake Fluid Flush Procedure
Coming SoonDetailed instructions for performing a brake fluid flush on the Audi S4, including required tools and fluid specifications.
Brake Rotor Inspection and Replacement
Coming SoonGuide to inspecting and replacing brake rotors on the Audi S4, including minimum thickness specifications and proper installation techniques.
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