My personal favorite happened with a local chain store almost 30 years ago. I bought an aftermarket brake master cylinder for a customer with a’75 Landcruiser. I gave the customer the option of OE, but not only was the aftermarket cheaper, it had a lifetime warranty.
I installed it and had the customer stop by to pump the pedal while I bled the brakes. He and his wife were on their way to a nice dinner and were dressed up. I said it would only be a few minutes. 15 minutes later I’ve got no pedal, and have more than used up their patience. I’m also a little worried about losing my credibility over something that should be so simple. I said“Give me 5 more minutes, I want to try something.”
One of my friends had just converted his ‘75 to disc brakes, had bought a new master cylinder, and had given me his old one. I pulled it off the shelf and bolted it into my customers truck.
I had pedal in two minutes.
I returned the aftermarket cylinder to the store the next day but before I could explain the process I went through, the store manager got on a proverbial soapbox and told me how tired he was of dealing with stupid mechanics that don’t know how to work on brakes! He literally spent 3 minutes on this tirade.
Once he was finally winded, I just politely said “If I’m so stupid, how is it that I could put a used master cylinder on and make it work, but not this one.”
Without physically moving an inch, I had managed to kick the soapbox out from under him. I got an apology, a new master cylinder, and some first class treatment from that store after that.
