Date registered: Apr 2014
Vehicle: 1998 MB E300TD, 1997 MB E320
Location: LA, CA
Mentioned: 125 Post(s)
Quoted: 763 Post(s)
It's all in the QA and how much pressure the hose can take before bursting.
Mercedes massively overspecs the brake hoses, they are rated to take up to 200 bar, and then limit the car so the maximum it can output to each corner is maybe 100 bar, 140 if you're stomping on it with two feet and bracing against the seat.
This is to allow plenty of margin in case of decay and rust taking away some of the support, plus for longevity and extreme dependency. I've seen 40 year old MB with original brake hoses.
How much QA do you think they put into that $5 hose? Just slap on a regular hose specced for an aircooled VW beetle, put in the fitting for the MB and done? How would you know? Guess you'll find out at the scene of the next accident if that hose can withstand the pressure or not.
I've seen cheap hoses burst before...usually on cars that were previously in accidents. I've seen more than a few cars come in on a tow truck leaking brake fluid everywhere because a $5 aftermarket hose burst...almost always as a result of the body shop rebuilding the front corner. When they get authorization from insurance company using OEM parts and prices, and then once the check comes in, they start to use aftermarket parts to keep the profits high.
I've been interviewed and retained as an "expert" witness in lawsuits for this exact scenario. But what do I know? I'm just an idiot on the internet bleating useless facts.
Anyway, I've done my part. Please take care, I'm out.
--1998 MB E300TD 291k
--1997 MB E36 Frankenstein'd AMG 199k
--2011 Suzuki DL650 58k
--1997 MB E320 161k. SOLD...loved that stupid car.
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--1997 MB C36 AMG 273k -- stripped and junked