Audi Audi A4 2001-2004 Brakes Specifications
Detailed technical specifications and service information for the 2001-2004 Audi A4 brake system. Includes front and rear brake components, ABS system details, torque values, and maintenance procedures.
Brake System Overview Specifications
This document provides detailed specifications and technical information for the brake system of the 2001-2004 Audi A4. It covers key components, dimensions, and operational parameters. Use this guide to understand the braking system's architecture, maintenance requirements, and performance characteristics. Refer to the sections below for specific details and the quick reference section for key specifications.
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Navigate through the document by selecting sections from the table of contents. Each section provides detailed information on specific brake components, with subsections offering technical specifications and operational details.
Key Specifications
Front Rotor Diameter
280 mm
Rear Rotor Diameter
245 mm
Recommended Brake Fluid
DOT 4
ABS System Type
Bosch ABS 5.3
Brake Booster Type
Vacuum-assisted
Available Specifications
Front Brake Specifications
This section details the specifications for the front brake components of the 2001-2004 Audi A4, including rotor dimensions, caliper types, and pad requirements.
Front Brake Specifications
This section details the specifications for the front brake components of the 2001-2004 Audi A4, including rotor dimensions, caliper types, and pad requirements.
Front Brake Disc and Pad Specifications
- Disc rotor diameter: 280 mm
- Disc thickness: 22 mm
- Pad type: Semi-metallic
- Pad wear limit: 2 mm
- Caliper type: Single piston floating caliper
- Disc material: Ventilated steel
Front Brake Caliper Details
- Caliper piston diameter: 54 mm
- Number of pistons: 1
- Caliper finish: Painted
- Bleeder screw location: Top of caliper
- Banjo bolt size: M10 x 1.0
- Caliper mounting bolts: M12 x 1.5
Rear Brake Specifications
This section provides detailed information on the rear brake components, including rotor dimensions, caliper specifications, and pad details.
Rear Brake Specifications
This section provides detailed information on the rear brake components, including rotor dimensions, caliper specifications, and pad details.
Rear Brake Disc and Pad Specifications
- Disc rotor diameter: 245 mm
- Disc thickness: 20 mm
- Pad type: Semi-metallic
- Pad wear limit: 2 mm
- Caliper type: Single piston floating caliper
- Disc material: Solid steel
Rear Brake Caliper Details
- Caliper piston diameter: 38 mm
- Number of pistons: 1
- Caliper finish: Painted
- Bleeder screw location: Top of caliper
- Banjo bolt size: M10 x 1.0
- Caliper mounting bolts: M12 x 1.5
Brake Fluid and Hydraulic System
This section outlines the specifications for the brake fluid and hydraulic components, including fluid type, reservoir capacity, and master cylinder details.
Brake Fluid and Hydraulic System
This section outlines the specifications for the brake fluid and hydraulic components, including fluid type, reservoir capacity, and master cylinder details.
Brake Fluid Specifications
- Recommended fluid type: DOT 4
- Fluid capacity: 0.5 liters
- Reservoir material: Plastic
- Reservoir location: Under hood, driver side
- Fluid change interval: Every 30,000 miles
- Fluid boiling point: 230°C (446°F)
Master Cylinder Details
- Master cylinder type: Dual chamber
- Cylinder bore diameter: 20 mm
- Stroke length: 35 mm
- Reservoir cap type: Screw-on
- Mounting bolts: M8 x 1.25
- Fluid level sensor: Yes
Anti-Lock Braking System (ABS)
This section provides specifications and details for the ABS system, including control module, sensors, and wiring.
Anti-Lock Braking System (ABS)
This section provides specifications and details for the ABS system, including control module, sensors, and wiring.
ABS Control Module
- Module type: Bosch ABS 5.3
- Location: Under hood, passenger side
- Mounting bolts: M6 x 1.0
- Power supply: Direct from battery
- Communication: CAN bus
- Diagnostic port: OBD-II
ABS Sensors
- Sensor type: Active wheel speed sensor
- Front sensor location: Hub assembly
- Rear sensor location: Hub assembly
- Sensor voltage: 12V
- Signal type: Digital
- Connector type: 3-pin
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Brakes Specifications
Overview
- Type
- ventilated disc (front), solid disc (rear)
- Configuration
- front-engine, front-wheel drive (FWD) or quattro all-wheel drive (AWD)
- Platform
- Volkswagen Group B6
- Material
- cast iron (rotors), aluminum alloy (calipers)
- Location
- front and rear axles
Dimensions
- Front Rotor Diameter
- 11.8 in (299 mm)
- Rear Rotor Diameter
- 10.2 in (259 mm)
- Front Rotor Thickness
- 0.86 in (22 mm)
- Rear Rotor Thickness
- 0.79 in (20 mm)
- Front Caliper Piston Diameter
- 2.13 in (54 mm)
- Rear Caliper Piston Diameter
- 1.65 in (42 mm)
- Brake Pad Width Front
- 1.97 in (50 mm)
- Brake Pad Width Rear
- 1.65 in (42 mm)
Materials
- Brake Discs
- cast iron
- Brake Pads
- semi-metallic
- Calipers
- aluminum alloy
- Brake Fluid
- DOT 4
Features
- Braking Systems
-
- Anti-lock Braking System (ABS)
- Electronic Brake Distribution (EBD)
- Anti-Slip Regulation (ASR)
- Traction Control System (TCS)
- Cooling Features
-
- ventilated front brake discs
- rear brake disc cooling ducts
- caliper cooling channels
- Structural Features
-
- two-piece front brake rotors
- sliding rear calipers
- stainless steel brake hoses
- Control Systems
-
- Electronic Stability Program (ESP)
- Brake Assist System (BAS)
- Regenerative braking (on models with automatic transmission)
- Wear indicators
-
- audible wear sensors on brake pads
- visual wear indicators on front pads
- electronic wear monitoring system
Safety Features
- Anti-Lock Braking
-
- four-wheel ABS with electronic control
- emergency brake assistance (EBA)
- Electronic Stability
-
- traction control integration
- vehicle stability enhancement
- Emergency Braking
-
- panic brake assist
- electronic brake force distribution
Comfort Features
- Noise Reduction
-
- damped brake discs
- noise-insulating brake pads
- rubber-mounted calipers
- Pedal Feel
-
- power brake booster
- progressive brake pedal ratio
- adjustable brake pedal position
- Low Dust
-
- low-dust brake pads
- self-cleaning brake rotors
Accessories
- Upgrade Kits
-
- high-performance brake pads
- upgraded brake rotors
- stainless steel brake lines
- performance brake fluid
- Sensors
-
- pad wear sensors
- brake fluid level sensor
- parking brake sensor
- Tools
-
- brake bleeding kit
- brake cleaner spray
- tire pressure gauge
Maintenance
- Service interval
- every 15,000 miles (24,140 km) or 12 months
- Service Items
-
- inspect brake pads and rotors
- check brake fluid level and condition
- bleed brake system if necessary
- clean and lubricate brake components
- inspect brake hoses and lines
- Maintenance Notes
- Use only DOT 4 brake fluid. Replace brake pads when thickness reaches 1/8 inch (3 mm). Inspect rotors for warping or excessive wear.
Warranty
- New Vehicle
- Miles: 50,000 milesYears: 4 yearsCoverage: all brake components
- Wear Items
- Miles: 24,000 milesYears: 2 yearsCoverage: brake pads and rotors
- Replacement Parts
- Miles: unlimitedYears: 2 yearsCoverage: manufacturing defects on replacement parts
- Repair
- Miles: 12,000 milesYears: 1 yearCoverage: labor costs for brake repairs
Production Details
- Manufacturer
- Audi AG
- Manufacturing Process
-
- cast iron rotor casting
- machining and balancing
- aluminum alloy caliper casting
- assembly and testing
- Quality Control
- inspection: dimensional and surface finish inspectionTesting: leak testing and performance validationCertification: ISO 9001:2015 certified
- Sustainability Practices
-
- recycling of scrap materials
- energy-efficient manufacturing processes
- reduction of hazardous waste
- Production Metrics
- Annual Production: 500,000 unitsDefect Rate: <1%Warranty Claim Rate: <2%
Service Information for brakes Service
Maintenance and service requirements specific to this component
- inspect brake pads for wear
- inspect brake rotors for warping or scoring
- check brake fluid level and condition
- clean brake components
- inspect brake hoses and lines for cracks or damage
Recommended for normal driving conditions. Use only DOT 4 brake fluid.
- replace brake pads if worn below 1/8 inch
- inspect and machine brake rotors if necessary
- bleed brake system to remove air
- inspect and replace brake hoses if damaged
- test brake system performance
Special tools required for bleeding the brake system. Ensure proper calibration of ABS system after service.
- replace brake rotors if excessively worn
- replace brake fluid completely
- inspect and clean brake calipers
- inspect and replace parking brake shoes
- perform comprehensive brake system test
Critical service interval. Failure to maintain may lead to reduced braking performance and safety risks.
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the recommended brake pad thickness for a 2001-2004 Audi A4?
What is the recommended brake pad thickness for a 2001-2004 Audi A4?
The recommended minimum brake pad thickness for the 2001-2004 Audi A4 is 3mm. Pads thinner than this should be replaced immediately to ensure optimal braking performance and safety.
Q2 What type of brake fluid should be used in a 2001-2004 Audi A4?
What type of brake fluid should be used in a 2001-2004 Audi A4?
The 2001-2004 Audi A4 requires DOT 4 brake fluid. The system should be flushed and refilled every 2 years or 30,000 miles, whichever comes first, to maintain brake performance and prevent moisture buildup.
Q3 What is the brake rotor thickness specification for the 2001-2004 Audi A4?
What is the brake rotor thickness specification for the 2001-2004 Audi A4?
The minimum allowable brake rotor thickness for the 2001-2004 Audi A4 is 22mm for the front rotors and 10mm for the rear rotors. Rotors should be measured with a micrometer and replaced if they are below these specifications.
Q4 How often should the brake system be inspected on a 2001-2004 Audi A4?
How often should the brake system be inspected on a 2001-2004 Audi A4?
The brake system should be inspected every 10,000 miles or during every routine service. This includes checking pad thickness, rotor condition, brake fluid level, and the integrity of brake lines and hoses.
Q5 What is the torque specification for the brake caliper bolts on a 2001-2004 Audi A4?
What is the torque specification for the brake caliper bolts on a 2001-2004 Audi A4?
The brake caliper bolts on the 2001-2004 Audi A4 should be torqued to 30 Nm (22 ft-lbs) for the front calipers and 35 Nm (26 ft-lbs) for the rear calipers. Always use a calibrated torque wrench to ensure proper tightening.
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 A4 Brake System Service Manual
Coming SoonOfficial Audi service manual detailing brake system maintenance, repair procedures, and specifications for the 2001-2004 A4.
Brake Fluid Flushing Guide
Coming SoonStep-by-step guide on how to properly flush and replace brake fluid in a 2001-2004 Audi A4, including safety precautions and tools required.
Brake Pad and Rotor Replacement Tutorial
Coming SoonDetailed tutorial on replacing brake pads and rotors for the 2001-2004 Audi A4, including torque specifications and alignment tips.
Audi Genuine Brake Parts Catalog
Coming SoonCatalog of genuine Audi brake components, including pads, rotors, and calipers, specifically for the 2001-2004 A4.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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