The correct procedure of a vehicle’s braking system depends on miscellaneous factors.During maintenance work, a the majority of attention is payment to brake pad wear but often neglecting to examine the thickness that the rotors. Although completely incorrect, that is common id that the brake rotor is not subjected to wear. In really fact, the same phenomenon responsible because that brake pad wear leader to wear come the brake rotor together well.

You are watching: What is the minimum thickness of a brake rotor


The rotor wear limit is specified, as thickness below this specification will not guarantee the exactly braking efficiency. This is a basic parameter and should be maintained in mind during routine checks.
Reduced thickness reduce the heat dissipation volume of the rotor and also its mechanically strength, triggering a collection of an important faults and also failures, together as:
the formation of thermal cracks ~ above the braking surface, because of the climb in temperature and the palliation in the resistance thicknessdeformation the the brake rotor, causing vibrations and noiseincreased pedal travel, led to by palliation of thickness the the braking surface. In too much cases, this can also lead to loss the tightness ~ above the component of the caliper piston, with the risk of the pads themselves coming the end of their seat or seizing.
In enhancement to the over problems, the use of a worn rotor could lead come the onset of an additional extremely dangerous phenomena, which might be created in details in conditions of heavy-duty auto use. These two concerns are vapour lock and also fading.The high rotor temperature caused by a huge number of braking action - which is typical on a mountain trail - might generate the formation of vapour lock: in other words, the increase to over 200°C in the temperature the the braking fluid.The liquid overheating generates wait bubbles within the circuit, waiting bubbles are compressible, which leads to no deceleration once pressing the brake pedal, in spite of being pressed all the method down.
The phenomenon of fading is also tied come the rise in temperatures, as result of the palliation in the rotor thickness and the heavy-duty use of the vehicle. This climb in temperature reduces the friction coefficient between the brake pad and also the brake rotor, with the following increased braking distance.
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To measure the minimum brake rotor thickness correctly, girlfriend will need to use a gauge. Measurements should it is in taken in at least 4 different points. The shortest value have to be supplied as referral for the entire rotor.This value must be contrasted with the number etched ~ above the rotor and also indicated through the wording MIN TH = (Minimum Thickness), followed by the worth in millimetres. If the measure up taken reflects values listed below the MIN TH, climate you must replace the rotor.Most importantly, it should be listed that rotors need to be replaced on both sides even if only among the pair proves come be listed below the minimum stay level.
To guarantee the security of the driver and also all passengers, the entire braking system should be confirm on a continual basis. This ensures the your brakes room working properly, and also avoids feasible breakages or damage.All faulty materials must be changed at every check.
During the vehicle’s MOT or special servicing, the is crucial that a intuitive inspection that the condition of the brake rotors is done. Together a general rule, brake rotors need to be replaced throughout every other brake pad replacement.
Replacement have to take ar according come the manufacturer’s specifications, utilizing a talk wrench to tighten the screws, applying the correct torque value, and also following the correct tightening sequence.

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