Audi & Volkswagen (VW) Bosch 5.3 ABS Pump & Controller ECU ...
ABS Light On No Communication Wheel Speed Sensor Faults Juddering When Braking Whatever the faults, give us a call today on 0871 2887 666 and let us quote you happy, we even carry many of the most common ABS units in stock ready to be dispatched... 1996 – 2001 Audi A4, A6, S4 1996 – 2001 VW Passat When it fails, the ABS light will appear on the dash and the most common faults with these units is no communication and wheel speed sensor faults. We repair all types of ABS pumps & controller modules but this blog post in particular is about the very common Bosch 5. All BOSCH ABS units start with either 0265 or 0273. If the problem is not caused by the brake light switch or by the link rod sticking, it\’s possible that the link rod or servo push rod have been adjusted incorrectly. If it’s an ATE ABS unit then the part numbers will start with 10 and OEM part numbers do vary. If that’s the problems you’re having then no doubt we can repair it for you, saving you £££’s on what you’d be paying if you had bought a brand new unit & because we’re repairing your own unit, you don’t have to pay to get it recoded or programmed... A very common fault on practically all VW’s & Audi’s is the ABS pump and controller module failing. Whichever unit you’ve got, we always suggest contacting us with the full part numbers first to get an accurate quote for the cost of repairs or to find out if we’ve got a replacement unit in stock. It will be a hydraulic problem and not necessarily the ABS pump itself but it will need to be diagnosed correctly. Solutions: Take a short drive until the brakes begin to bind, once they are binding then take the vehicle into a workshop and follow these steps. Feel each wheel and start with hottest wheel/brake first. The heat will be transferred to the brake fluid and as this temperature increases, the fluid will expand. If the brakes release now, then it\’s highly probable that the master cylinder seals have swollen through contamination and are blocking the compensating/relief ports. (Use a rag to stop fluid squirting everywhere because brake fluid works like paint stripper). If the expanded fluid cannot return to the reservoir, pressure builds up and this will cause the hydraulic brakes to be applied. With the brake pedal released, the master cylinder pistons should be fully home. If the brakes are free after you\’ve done this, the problem lies with the servo or the mechanical links to the pedal. When the brakes release, the problem is a faulty flexible hose attached to that wheel. With the brakes stuck on, slacken, by two to three threads, the nuts that hold the master cylinder to the servo. When the fluid cools down, pressure reduces and the brakes release. Check that an incorrectly adjusted brake light switch is not holding the pedal on slightly. If the brakes do not release, proceed to the next hottest wheel and repeat....