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The rotor runout dial indicator is used primarily to measure rotor runout. Likewise, it may be used to measure arbor runout on the bench lathe, wheel bearing play, and hub runout. Even so, the tool must be used to correctly in order to get an accurate reading.
For every brake job, you should always use a micrometer or dial indicator to measure for runout (rotor and flange) and the dimensions of the rotor before brake service is performed.
Run out needs to be measured with a dial indicator with the rotor mounted on the vehicle however, DTV can be measured using a precision micrometer off the vehicle. This is done by measuring the thickness of the rotor 25mm in front of the outer edge.
Run-out or runout is an inaccuracy of rotating mechanical systems, specifically that the tool or shaft does not rotate exactly in line with the main axis. … Radial run-out will measure the same all along the main axis. Axial run-out is caused by the tool or component being at an angle to the axis.
If it is excessive, use an outside micrometer to measure the thickness of the rotor and compare it to the minimum thickness stamped on the rotor.
The maximum allowable runout at the rotor friction surface is 0.002 inch (0.050 mm) as stated by most manufacturers.
Hold the straight edge of your ruler lengthwise against the surface of the brake rotor. Look between the rotor and the ruler. If you see a gap between the two, it’s a good sign the rotor has been warped. A warped rotor must be replaced with a new one.
A depth micrometer is a sensitive tool that is used to measure the depth of small holes and bores. Used by engineers and mechanics, this device has a series of unique pieces that help it dial in an exact measurement. Reading depth micrometers is a precise science that must be performed carefully.
Run out should not exceed 0.07mm, any reading above this can have damaging consequences to the entire braking system and cause vibrations through the steering wheel and brake pedal, something which could result in a returning, unsatisfied customer if they’re experiencing this when driving.
Lateral runout is the amount of side to side movement of the rotor as it rotates. Today’s vehicles have extremely tight lateral runout specifications. Most vehicles have a specification of two-thousandths of an inch or less.
An easy method to check lathe runout: 025″ of the chuck at its center point. Then put a straight edge on the tool rest and against the chuck. Rotate the chuck, observe the motion of the straight edge and gaps between the chuck and straight edge, check it when the largest gap appears, and that is the run-out.
Slowly rotate the shaft to look for runout, and measure the amount. Then move the indicator to the shaft adjoining the coupling hub. Measure the same way. If the hub and shaft travel by approximately the same amount, the runout is probably due to a bent shaft.
Since 2010, the 1.5mm minimum recommended rotor thickness has been printed on Shimano rotors. As for your specific rotors, that’s the least easy information to find.
Call your local OEM dealer and ask for the original rotor sizes or OEM rotor/pads part numbers based on your vehicle’s VIN number (VIN# is referenced in your ownership papers). The dealership may not tell you the rotor size, but they will give you the genuine part numbers for your vehicle.
Rotor Diameter means the cross sectional dimension of the circle swept by the rotating blades of a wind-powered energy generator.
- Cut the straw where you have marked it.
- Place the cut-off end of the straw next to your ruler and mark 5mm from the end.
- Move the mark to 0mm on your ruler and take your final measurement.
- If your brake pads are 4mm and less, consider replacing them.
Tip: While measuring, keep a distance of about 45′ apart and 10mm from the rotor edge as the actual brake pad doesn’t contact those edges. Also, for slotted rotors stay away from measuring the slots, as those will skew the results. Same with dimpled/cross-drilled rotors. Keep clear of measuring the holes.
This micrometer is used for precisely measuring thickness of brake rotor surfaces.
It’s important to measure your brake rotor wear every 10,000 miles or at the very least every time you change your brake pads. … In order to get an accurate measurement for the amount of brake rotor wear we depend on our trusty micrometer. Prepare your car so you can remove the wheel.
Brake Rotors Warp From Heat — Myth Busted. Damaged brake rotors can cause your car to shudder and shake under braking, and that’s often attributed to “warped” brake rotors. … This surface can become uneven and this is most commonly caused by heat from emergency or aggressive braking.
A micrometer is a tool that measures the size of a target by enclosing it. Some models are even able to perform measurements in units of 1 μm. Unlike hand calipers, micrometers adhere to Abbe’s principle, which enables them to perform more accurate measurements.
When measuring the depth of a drilled hole, it is important to measure at the outside wall of the hole to obtain the depth of the full diameter portion of the hole (Figure 6). Hold the measuring rod next to the wall of the drilled hole to assure an accurate full diameter depth measurement.
Uneven wear and excessive runout can be caused by poor manufacturing or quality control, overtightening or uneven tightening of the lug nuts, and dirt or rust between the rotor and the wheel hub.
Brake judder is the vibration felt through the steering wheel and suspension when the brakes are applied at certain speeds and pressures. It can vary from a barely noticeable vibration to a violent judder – experienced either through the brake pedal or steering wheel.