Audi Disc Brake Caliper - TRW 4G0615403A

Product Information

Brake calipers are controlled by your vehicle's brake hydraulic system. When the pedal is pressed, brake fluid pressure is pushed through the master cylinder to the caliper, which extends the piston and forces the brake pads against the rotors to slow your vehicle down. Brake calipers are a pretty simple mechanical device that usually consists of a caliper housing, caliper piston, and an internal square-cut seal.

Brake calipers are subjected to extreme heat with constant heating and cooling cycles. The most common brake caliper failure that occurs is the failure of the internal square-cut seal. The seal fails due to a corroded piston that can tear the seal preventing the caliper piston from being able to retract after being pushed outward. This results in dragging brakes and uneven pad wear.

The best preventative maintenance you can do for your braking system is to flush it regularly. Brake fluid is hygroscopic which means it absorbs moisture over time. Moisture in the braking system can cause brake lines and seals to corrode internally resulting in premature failures. FCP Euro recommends flushing your vehicle's brake system yearly for regular use with the interval increasing for heavy or high mileage use.

• Caliper piston is seized or will not push back into bore
• Brake fluid leaks from piston boot
• Broken or seized bleeder screw
• Heavily corroded brake caliper piston

About TRW

TRW Automotive is a business focused on the use of technology and manufacturing skill to make the impossible, possible. In 2014 TRW Automotive was acquired by ZF, a global leader in manufacturing OE (Original Equipment) spare parts for vehicles around the world. They remain as one of the world’s largest automotive suppliers through a combination of aftermarket and OEM (original equipment manufacturer) offerings. Their specialties span from electronics to steering to braking and occupant safety. TRW is OEM to over 40 major vehicle manufacturers, employing over 60,000 worldwide. The result? Chances are TRW parts were used during the manufacture of your car, so why not use TRW replacement parts when they need to be replaced? Stick with an OEM brand you can trust.

TRW Automotive is a global leader in automotive safety, producing one of the largest arrays of active and passive safety technologies. It continues to be at the forefront of developments in vehicle dynamics, driver assist systems, foundation brakes, inflatable restraints, seat belt technologies and the electronics and software advancements that will enhance the safety, convenience and comfort of tomorrow's vehicles.

The TRW brand is part of ZF Aftermarket, leader in the world for Original Manufacturer [OE] quality automotive safety products. Our TRW Braking systems, Steering and Suspension parts, Commercial Vehicle components and Service Tools are legendary for their engineering quality and innovative design. They are also famously well tested, in-house and independently.