A Power Stop complete Sport kit, from rockauto.com, to here is $1222.85 ($951.00 American). Add to that 4 hours of labor max at $150.00 = $600.00 for a total of $1822.85. Now if that were Mopar parts, new versus remanufactured calipers, plus a rebuild of the "drum in hat" e-brakes, the price could get to the $2600.00, estimate wise.
We don't know the OP's details, but I can see it happening. Seems to me that around $700.00
used to be an estimate from Dealerships for replacing pads and rotors, per end, i.e. around $1400 plus tax total for all 4 brakes. Calipers, upsell hoses, and shop supplies would need to be added to that. Maybe even a wheel sensor or two.
RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.
www.rockauto.com
ABS stuff, by Mopar especially, isn't cheap either, and could add another $1000.00 easily. I was recently quoted $900.00 for a sliding door latch I didn't need. The "Rest of the Story" is in another Thread and it involves warranty work (lock actuator).
RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.
www.rockauto.com
Giving a Shop free rein to make a profit off of parts, and upsells, can get the price up there. With auto repairs, one can get caught between a rock and a hard place. Rockauto.com, for example, can be too expensive for freight for heavy items. Partsavatar.ca is mostly where I look for price comparisons for say brake rotors. Feight is free if order is over a certain amount.
Front Disc Brake Upgrade Kit by CENTRIC PARTS 909.67003
partsavatar.ca
Speaking of being between a rock and a hard place, selling an old vehicle with non functioning brakes isn't a money maker either. It's pretty much a give-a-way. The price to replace the vehicle may be an even worse scenario. Hopefully the $3600 will keep the OP's van working for another couple years, versus buying someone elses problems, or losing thousands in depreciation on a new vehicle.
Being a DIYer, or using a Shop that's qualified and trustworthy, is so important to keep vehicle maintenance costs down. Should be interesting with an EV down the road. Watch out cash register! Material prices will sky rocket (lithium, copper, nicket, graphite, etc.). That's already happening and environment restrictions on mining are/will be getting stricter. What happens to auto Mechanics, do they become Electricians?

Fossil fuel generated electricity is cheap now compared to what unsubsidized windmill generated electricity will be down the road. The hidden cost of subsidies - I won't go there.
High repair costs, even with newer vehicles, especially when it comes to brakes, flushes, oil changes, electronics, etc. are fairly normal to the unsavvy eye. Take a peek:
The video: