Measuring Rotors & Brakes
Simply remove the bottom sliding pin on the calliper, The calliper will then move up just like the pic above. Once the calliper is out of the way then the brake pads should slide out, sometimes they might need a tap.
The calliper - Is what the brake line runs to, to the front brakes & pumps the fluid behind the the piston.
The piston is what pushes against the inside pad.
The calliper moves on sliding pins & pulls against the outside pad.
The sliding pin helps the calliper move, It will most all ways be the bottom sliding pin that is removed to get the pads off.
Once the sliding pin has been removed then the calliper will slide up.
Remember if the pads need replacing the piston will need to pushed back. A G-clamp can do this with a piece of small timber.
When the calliper might need a bit of a nudge to get out.
Once everything has been removed & we can see the rotors, then we can start our visual inspection.
The pads removed!
With the shims.
With the shims.
The three pics below are showing how to measure the thickness of the pads using an Vernier Calliper
When checking the pads we need to check for even wear, Check the shims for cracks or even rust.
These rotors are vented rotors which means the holes/vents on the side are there to help cool down the rotors when there is braking applied & begin to get hot.
When measuring the rotors we are using a Micro Meter to check the thickness of the rotor.
We are also looking for Cracks, rust & deep scratches. If the rotor is within specs then we can make a decision if it needs to be machined or replaced.
The pic on the left is showing the back right drum & disk. Not every vehicle will have these, Some will just have a drum. When servicing the back brakes we needed to remove the calliper completely.
How this one works is when the piston winds on to the back brake pad.
The pic on the right is showing the back drum & disk
Another thing to measure is the run out of the rotor, by doing this we use the DTI Gauge. Unfortunately I didn't get any photos of this.
We are also looking for Cracks, rust & deep scratches. If the rotor is within specs then we can make a decision if it needs to be machined or replaced.
The pic on the left is showing the back right drum & disk. Not every vehicle will have these, Some will just have a drum. When servicing the back brakes we needed to remove the calliper completely.
How this one works is when the piston winds on to the back brake pad.
The pic on the right is showing the back drum & diskAnother thing to measure is the run out of the rotor, by doing this we use the DTI Gauge. Unfortunately I didn't get any photos of this.
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