A digital multimeter or DMM is a useful instrument for measuring voltage, current and resistance, and some meters have a facility for testing transistors and capacitors. You can also use it for checking continuity of wires and fuses. If you like to DIY, do car maintenance or troubleshoot electronic or electrical equipment, a multimeter is a handy accessory to have in your home toolkit. Car manufacturers were consolidating or closing throughout the 1920’s and during the depression that followed. Not many of these American car makers have survived to the present day, but even those who have survived are becoming increasingly uncompetitive and are now experiencing major problems that threaten their existence largely due to competition from foreign auto manufacturers.
Hard rock miners, however, actually encouraged rats to inhabit the mine tunnels, by saving crusts and crumbs of bread for them. The rats acted as a low-tech safety system. Being ultra-sensitive to tremors or quakes, they provided early warning of impending collapses or cave-ins. If rats suddenly went running for the exit, the mine workers were right behind them.
And, as for your ripped master cylinder, well, that sounds sadly typical. The master cylinder is under the hood and they probably didn’t even check it until all the hardware etc. that can be seen by pulling off the wheels was already done. That’s not textbook, particularly before contacting a customer, but, frequently, that’s how it goes in reality. A good break tech checks everything before ever giving you a call.
I’m a nature lover. As proof, I’ve sustained injuries chasing the recycling truck down the alley on a slippery winters morning. I’m in a CSA to help support local small farmers and I buy organic milk. Vanning is where I’ll have to take a raincheck on natural resource preservation. At 10-15 mpg, I’m undoing a lot of Prius owners good works… and this was a challenge to overcome.
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Checking the customer’s history is a another opportunity to up sell periodic maintenance services. If a car has 75k miles on it and it never had a major service done like a 30k or 60k mile service, check the car over for the items listed on those services. If it needs service, up sell it.