i'm late to the thread, but I'll add my 2 cents...
... I am a proficient car guy & noticed that the parking brake had started to not hold the vehicle; I looked at the rear brake rotors/ pads & noted that the rear brakes are probably worn out.
reported to the contractor & he said don't worry about it <shrugs>
a few weeks go by... squealing is now heard at the rear end when the brakes are applied. I know what that means! those brakes are going to be metal-to-metal soon!
reported to the contractor & he said he'll get someone to look at it during the sunday-monday weekend <shrugs>
I returned to the vehicle on tuesday & it's still squealing... he lied to me & said most of the braking takes place in the fronts anyways & it should last another week.... wrong!
as I was coming to a stop sign, I applied the brakes and heard a "pop"
rear brake caliper piston had came out & I lost all brake pressure! almost T-boned a white SUV with her kids in the back seat!
since the emergency/ parking brake works with the rear brakes, that was useless as well; I just shifted to N & turned on my hazards to cross the intersection & slowly go to the curb.
called the contractor to yell at him & send a temp box truck so I can try to salvage the rest of my deliveries (took him an hour to stop by with a budget rental box van) I transferred my packages & said to him that I was lucky that my immaculate record wasn't tarnished by this close call.
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he learned his lesson and now has a mechanic for his fleet of delivery vehicles, similar to bbsam
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I've had other situations but not as severe
like a stuck brake pedal switch that drains the battery down overnight,
mechanic overfilled the crankcase oil by a few quarts (that'll surely kill your engine in a few hundred miles)
bulbs burned out that I can replace by myself and just get reimbursed by him at a later time
I'll clean the vehicles myself & tell him that this particular van will be my own when I work for him
battery cables coming loose from just the constant vibration
alternator not working
etc...
I had another contractor that had a stepvan without abs & it was a monster to drive when the weather is wet or icy (white knuckles) & told him that I don't feel safe driving this vehicle; he knew about it & promptly gave me a rental during those times. To this day, I still see it on the road, driven by a poor sucker who doesn't want to bring it up to him
I'd rather be safe than sorry.