Instead of a "service" just ask about packing and adjusting the brakes. If there is an issue to attend they will give you a call. Small shop with some seasoned technicians should have no issues doing the work for less. This just basic old-school mechanical work.
Seen this plenty of times at an auto dealership. Going in for an oil change for maybe $75 and the dealer says it is due for a "60,000 mile service" or something similar just to tack on another $450+. Basically get the same thing and now the oil change is $525 + wipers and air filter (that were unneeded).