A very common problem that leads many drivers to look for the workshops is the vibration of the pedal, which, in most cases, is caused by a bent component. But how do you know if the brake disc is warped or if the cause is the wheel hub? Repairman Fernando Neves, from Auto Mecânica Neves, from Mauá-SP, awarded in the Feras da Oficina Nakata promotion, gives tips to solve this diagnostic issue before changing the part.
The mechanical professional proceeds as follows to solve these obstacles: mount the disk on the hub, place two wheel screws and leave everything tight; with the dial indicator and the magnetic base, measure the warpage and mark with chalk the points where the zero and maximum are; then disassemble, rotate the disk in half a turn and repeat the procedure.
According to Neves, with this test, it's easy to see what's wrong.
If only the disk is warped, the two values (zero and maximum) always appear in the same positions. When the measurements do not change, but switch places after turning, be suspicious of the cube. In vehicles where both parts are broken, each measurement gives a different value.
To solve these problems of vibration in the brake pedal, the mechanic chooses to make a very technical diagnosis, based on the measuring instruments.
Fernando Neves reports that this is what he did when the owner of a 2008 Chevrolet Corsa arrived at his workshop with this complaint. He says that during the repair the customer preferred that the disks be rectified, rather than replaced. “As the fault did not disappear, it was necessary to ask whether the hubs were in good condition. In this case, the disks had been rectified, but they didn't look good. It is also common to find new hubs that have been damaged by incorrect assembly.”
The Feras da Oficina Nakata promotion highlights the technical knowledge of repairmen, the best tips are awarded every month. To participate, simply access the official portal.