A bit of back story first: I bought a second-hand bike in 2020. It has SRAM Level TL installed from the start. It caught my attention that brake lever didn't return to the end and had very little travel. I asked a mechanic that I know and he said to not worry, so I didn't.
Fast forward 2 years I noticed that brakes are not returning and are braking/dragging all the time.
I went to a bike shop (not to the mechanic I asked before) asking for a fix (just an oil change I thought) but they told me there has to be something wrong with the caliper and not the oil and they need to open it and clean and put oil in it.
After 2 days the bike shop told me that cleaning didn't fix anything and I should replace the entire brake system and it is going to cost me around 400€ as each brake kit cost 180€ (big markup as the official SRAM page gives pvp 121 and you can find them far cheaper online)
Also I am checking right now SRAM directly say "Do not lubricate the pistons."
Does anyone have experience with SRAM hydraulic brakes? I have no clue and I am afraid that in the bike shop either.
Is it normal to just trash the entire system or they are just trying to scam me ?