Lateral runout of the brake disc is one of the faults that can occur in the vehicle’s braking system, as a result of the many times the pedal is used while driving. One of the most characteristic symptoms of this problem is steering vibration. REMSA recommends that you have this fault repaired immediately by a reliable workshop, as it can affect the braking system and thus jeopardise safety.
The repair of lateral runout of the brake disc should be started by the workshop professional by measuring the disc thickness to ensure it is within the parameters specified by the manufacturer. In addition, you should check that the lateral runout is within the maximum allowable values, usually between 0.05 and 0.1 millimetres. However, for greater safety we always recommended following the manufacturer’s instructions.
In addition, the professional must check whether the measured runout is caused only by the disc and the hub runout It is important to check both elements because in cases where there is lateral alteration of the measured position it may be due to contamination in the hub. Also, the operation can be used to clean the hub after the disc has been removed, a common but important maintenance operation.
If the cause of the lateral runout is an incorrect tightening of the wheel bolts/nuts with inadequate torque values, it would be necessary both to polish the discs and to replace the brake pads. And, in many cases, rotor replacement would also be required if the repaired rotor did not have the minimum thickness specifications to match the life of the new pads.
When installing new brake discs in the workshop, it is always advisable to do the same with the brake pads. In such cases, the professional at the repair centre should warn the customer to avoid hard braking as much as possible during the first hours of use of the car (roughly 200 kilometre), as well as to apply moderate brake pressure. In this way, the service life of the braking system components can be extended, in addition to better long-term performance.
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