As far as I am aware there are two official makes Bendix and ATE. But I'm sure there are some other brands out there too...

If you replace a caliper you need to have the same makes on the same axle - i.e. same on the front / same on the back because the caliper piston diameters are / might be different so you could get an uneven braking force - that will be unsafe.

The flexible hoses on a W123 are the same length for the front so I guess they'll be the same for a W126. The hard lines are going to be different however.

I have just bought ATE calipers for my W123 and they did not come with pads / retaining clips / wear indicators.

Buy some anti-squeak grease for the SIDES of the pads to stop any weird noises.

Check the condition of your rotor (disc brakes) before fitting your pads - if you are removing calipers - now is the time to change them.

Consdier checking your front wheel bearings whilst you are there - is the grease still good? Is the adjustment still OK?

You are meant to use new caliper bolts when fitting a caliper - apparently because MB doesn't trust anyone to use thread locker!

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!