Audi RS4 Anti-Lock Brake Computer for Sale | OEM Used ABS

Description

About the Audi RS4 Anti-Lock Brake Computer

Looking for a replacement Audi RS4 anti-lock brake computer or ABS / ESP module? Part Nests sources OEM used ABS / ESP hydraulic control units for Audi RS4 high-performance applications. The Audi RS4 is Audi Sport GmbH’s high-performance variant of the A4 sedan / Avant wagon platform, produced across multiple generations: B7 (2006-2008 US-market sedan and Avant with 4.2 FSI V8), B8 Avant (2013-2015 – Avant only, not US-market for road use), and B9 (2018 plus sedan and Avant with 2.9T TFSI V6 – in some markets). The ABS / ESP module is a safety-critical electronic-hydraulic component that integrates both the antilock braking system electronic control and the hydraulic block that modulates brake pressure at each wheel during ABS / ESP activation. Replacement is a service that requires a qualified shop with proper diagnostic equipment, brake system bleed procedure capability, and VIN-specific coding tools. Call (855) 634-4447 to verify RS4 generation.

Audi RS4 Anti-Lock Brake Computer Specifications

• Type: OEM ABS / ESP hydraulic control unit (also called ABS Module, ESP Module, Anti-Lock Brake Computer, Brake Modulator)
• Function: Safety-critical electronic-hydraulic module integrating antilock braking system (ABS) electronic control, electronic stability program (ESP) function, and hydraulic block for brake pressure modulation at each wheel
• Construction: Combined unit with electronic module mounted to hydraulic block; multiple brake line ports for inlet (master cylinder side) and outlet (to each wheel caliper)
• Brake line interfaces: Inlet ports from master cylinder; outlet ports to each wheel caliper (front left, front right, rear left, rear right)
• Electrical interface: Multi-pin connector with multiple wires for power, ground, CAN bus communication, wheel speed sensor inputs, and other vehicle module communication
• Wheel speed sensor inputs: Receives input from wheel speed sensors at all four corners
• Communication: CAN bus communication with engine ECU, transmission control, instrument cluster, and other vehicle modules
• VIN coding requirement: Required after installation using OEM-level diagnostic equipment (Audi VAS / VCDS or equivalent dealer-level scan tool)
• Application: Audi RS4 B7 (2006-2008 US-market sedan and Avant 4.2 FSI V8), B8 Avant (2013-2015 European 4.2 FSI V8 Avant only, not US road-market), B9 (2018 plus sedan and Avant 2.9T TFSI V6); specify generation when ordering

Audi RS4 Platform Context

• Audi RS4 B7 (2006-2008 US-market): Sedan and Avant variants; powered by 4.2L FSI naturally-aspirated V8 producing 420 horsepower; 6-speed manual transmission; quattro all-wheel-drive standard; built on the B7 A4 platform – shares architecture with our Audi A4 ABS Pump from (same B7 era)
• Audi RS4 B8 Avant (2013-2015): Avant (wagon) only, not sold in US road market; 4.2L FSI V8 producing 450 horsepower; 7-speed S tronic dual-clutch transmission; quattro all-wheel-drive
• Audi RS4 B9 (2018 plus): Sedan and Avant variants; 2.9L turbocharged TFSI V6 (smaller engine than predecessors due to downsizing trend, but turbocharged for similar power output) producing 444-470 horsepower; 8-speed Tiptronic automatic; quattro all-wheel-drive
• Audi RS lineup context: The RS4 is part of Audi Sport GmbH’s RS-line lineup which includes RS3 (compact sedan – per our Audi RS3 Antenna listing), RS4 (this listing), RS5, RS6, RS7, and higher-performance R8 supercar
• Audi RS4 / RS5 relationship: The RS4 (sedan / Avant on A4 platform) and RS5 (coupe / Sportback on A5 platform) share platforms with their non-RS counterparts; the RS4 and RS5 share substantial engineering including brake systems – the Audi RS5 ABS Pump from is closely related to this RS4 ABS module
• Audi RS4 vs A4 brake systems: The RS4 uses substantially upgraded brake systems compared to the standard A4 – larger rotors, multi-piston calipers, performance-tuned ABS / ESP calibration – the RS4 ABS module is calibrated specifically for the RS4 brake system and is NOT interchangeable with standard A4 ABS modules

ABS / ESP Module Function and Safety Context

• Antilock braking system (ABS): Prevents wheel lockup during heavy braking by modulating brake pressure at individual wheels based on wheel speed sensor inputs
• Electronic stability program (ESP): Detects vehicle slip during cornering or evasive maneuvers and applies brake pressure to individual wheels to help maintain vehicle stability
• Traction control: Reduces wheel spin during acceleration on low-friction surfaces by applying brake pressure to spinning wheels
• Hydraulic modulation: Internal valves and pump modulate brake fluid pressure at each wheel independently – this requires extensive hydraulic infrastructure within the module
• Safety-critical operation: ABS / ESP module function is critical to vehicle braking safety; failure can result in loss of antilock braking capability, loss of stability control, or complete brake system compromise
• Common failure modes: Electronic module failure (capacitor failures, internal short circuits, ESD damage), hydraulic pump motor failure, hydraulic valve failures (sticking, internal leakage), pressure sensor failures, communication failures (CAN bus issues), wheel speed sensor input failures (sensor-side or module-side), connector terminal corrosion
• Symptoms of failure: ABS warning light on dashboard, ESP / stability control warning light, brake warning light, vehicle pulls during braking, ABS doesn’t activate during emergency braking, stability control doesn’t intervene during loss of grip, brake pedal feel changes
• Service required after installation: Complete brake fluid bleed using OEM-specified procedure (typically requires diagnostic tool to activate ABS pump during bleed for proper module internal bleed), VIN coding via Audi VAS / VCDS, wheel speed sensor calibration (where required), steering angle sensor calibration (where required), longitudinal / lateral acceleration sensor calibration (where required)

SAFETY-CRITICAL Service Requirements (CRITICAL Buyer Note)

• Qualified service shop REQUIRED: Audi RS4 ABS / ESP module replacement is a safety-critical service that should be performed only at a qualified Audi specialist or dealer service shop
• Complete brake fluid bleed REQUIRED: Brake fluid must be completely bled from the entire brake system using OEM-specified bleed procedure (typically requires diagnostic tool activation of ABS pump during bleed to properly purge internal module passages)
• VIN coding REQUIRED: Module requires VIN-specific coding after installation using Audi VAS / VCDS or equivalent dealer-level diagnostic equipment
• Sensor calibration REQUIRED: Wheel speed sensor, steering angle sensor, and longitudinal / lateral acceleration sensor calibration may be required after installation
• Brake fluid specification: Use only DOT 4 LV (or per Audi RS4 production year specification) brake fluid – never use silicone-based or other incompatible fluids
• Post-installation verification: Verify ABS, ESP, traction control all function properly; verify no warning lights; consider road test in safe area to verify proper braking response

Audi RS Cluster Context (and)

The Audi RS4 Anti-Lock Brake Computer (this listing) is part of our Audi RS-line parts cluster across batches:

• from : Audi RS7 Ashtray (interior trim for Audi RS7 sportback)
• from : Audi RS6 Armrest (interior component for Audi RS6 Avant / sedan)
• from : Audi RS5 ABS Pump (related safety-critical brake system component for Audi RS5 – closely related to this RS4 ABS module)
• from (this listing): Audi RS4 Anti-Lock Brake Computer (ABS / ESP hydraulic control unit for Audi RS4)
• from (this batch): Audi RS3 Antenna (roof shark fin antenna for Audi RS3 compact sport sedan)

These Audi RS parts span the modern Audi Sport GmbH RS-line lineup. The RS4 (this listing) and RS5 share substantial engineering including brake systems – they are companion sedan / coupe variants of the same A4 / A5 platform generation. For Audi A4 platform context, Audi A4 ABS Pump from covers the related A4 ABS pump (note RS4 brake system is upgraded over standard A4). Call (855) 634-4447 for application verification.

Vehicle Compatibility

Why Buy From Part Nests

• Part verified as ABS / ESP hydraulic control unit for Audi RS4 high-performance applications
• Application confirmed (Audi RS4 B7 sedan/Avant 2006-2008 4.2 FSI V8, B8 Avant 2013-2015 4.2 FSI V8, B9 sedan/Avant 2018 plus 2.9T TFSI V6 – specify generation when ordering)
• Electronic function verified at module level (no obvious failure indicators)
• Hydraulic block condition documented (no external leak indicators, no impact damage)
• Brake line port threads inspected (no thread damage, no cross-threading)
• Electrical connector terminals inspected (no corrosion, no bent pins, no terminal pushback)
• Mounting features verified (Audi RS4 specific engine bay / firewall position)
• Brake fluid ports capped during shipping to prevent contamination
• SAFETY CRITICAL component: Brake system installation requires qualified shop, complete brake fluid bleed using OEM-specified procedure, and VIN-specific coding after installation
• Specialty shipping to all 50 states (electronic-hydraulic safety component requires careful packaging)
• 15 day replacement warranty on component defects
• Audi RS4 experience and B7 / B8 / B9 generation distinction knowledge from our support team
• Call (855) 634-4447 to confirm your application before we ship.