VBT Front 321X30 Brake Discs (Pair) – Audi A8 – 5432344157

A best practice guide is available on request and supplied with all direct replacement brake discs and big brake kits.

Braking components are serviceable items and must be subject to regular inspections. Due to the nature of performance brakes, it is highly recommended that they are fitted and serviced by qualified technicians. DIY fitting is not advised.  VBT warranty is valid with the original purchaser only and is not transferable. 

Race/Track Use

No Warranty is offered or implied on any product purchased from Vagbremtechnic (VBT) for race Use, competition use, track day use or use on any race circuit or drag strip. 

Racing Brakes

Racing brakes supplied by VBT are not covered by any warranty due to the nature of their intended use. Racing brake pads are not covered by ECE-90 and is down to the purchaser to ascertain the suitability of the brake pads for their intended use. Contact VBT if require further information.

Brake Fitting Guide

Fitting Instructions for Brake Discs (Rotors) and Brake Pads    

Important General Information:

-           Brakes are safety critical and must be fitted by qualified persons only.

-           Special instructions issued by the vehicle and brake manufacturer must be observed.

-           Brake discs (rotors) should be replaced as axle sets.

-           In general, brake pads must be replaced at the same time to avoid poor brake operation and performance.

-           Ensure suitable PPE is worn

-           Ensure correct tools and equipment are used

Fitting:

-           Once the vehicle is in a safe position (on a suitable lift or axles stands with wheels chocked )

-           Remove the wheels in accordance with manufacturer’s instructions.

-          Clean off brake dust from the brake system using a suitable brake cleaner or vacuum. Compressed air must not be used. If inhaled, brake dust can be harmful to health.

-           Remove brake caliper and secure to the vehicle with appropriate means. It is advisable to complete one side at a time as components can be handed.

-          Calipers must not be left to hang on the brake hose, as this can damage the hose leading to complete brake failure.

-           Crack bleed nipple and attached a suitable bleed bottle then push piston back with a suitable wind back tool or pad spreader.

-           Remove caliper carrier (bracket)

-           Clean brake pad contact points on the caliper carrier and caliper to ensure correct brake pad alignment.

Failure to do this can lead to poor brake performance, brake noise and brake judder.   

-           It is advised that any brake pad fittings, springs, shims, bolts etc. are replaced.

-           Once the disc is removed, clean the hub face meticulously so it is free from corrosion, dirt and contamination. Hub faces should exhibit a bright metallic finish.

-           Measure hub run out with a suitable DTI kit. Run out should be no more than 0.03mm

-           Refit new disc, observing rotation orientation, using fixing screw torqued to manufacturers specification.

-           Measure disc run out. Disc run out should be no more than 0.07mm unless stated otherwise by vehicle manufacturer. (A guide to run out and problem solving is available from VBT).

Brake judder caused by incorrect installation will void any warranty.

-           Refit brake caliper and carrier, observing specified torque settings, along with new brake pads. Lightly grease pad contact points at each end of the pad (do not grease pad backplate unless specified by the brake or vehicle manufacturer). Use only authorised or non-metallic brake grease.

Copper grease must not be used on any part of the brake system and will void any warranty.

-           Clean wheel mounting face from any contamination before refitting and check for any damage of the wheel or tyre.

-           Tighten bolts crosswise and torque wheel fixing in accordance with the manufacturer’s specification.

Functional test:

-           Once the vehicle is back on the ground, repeatedly actuate the brake pedal to ensure correct travel and feel.

-           Top up brake fluid in line with manufacturers specification.

Caution: If mishandled, brake fluid can cause serious damage or injury. Observe the brake fluid manufacturer’s instructions.

-           Check for leaks on and around the full brake system.

Bed new pads and discs in for 200-300 miles, avoiding harsh or heavy braking unless otherwise stated by the vehicle or brake manufacturer.