There is nothing to "check". Look in the owners manual and change the belt according to the service requirements. They never "look" bad until they fail and destroy the engine.
on the firewall passenger side
Fuel Injected? In the fuel tank
just replace the whole caliper.
The B2600i does not have a pickup coil, it uses a hall effect sensor located inside the distributor to trigger spark. K6 Mazdatruckin.com
See if your public library has a Chilton's for your car to replace the clutch.
Mazdatruckin.com has a schematic for the B2600i vacuum lines in their tech section, it includes 4wd and cruise control devices. See the attached links below.
it is a chain driven timing belt...
Very possible. That info could be found in the owners manual also.
Firing order is usually 1-3-4-2. So start from the front of the pickup, going clockwise. (mine is a 1991 Mazda b2600i).
ignition problem
IF ITS A 1.8, THEN ITS NEXT TO THE TIMING COVER
timing BELT ( according to Gates , they make timing belts etc. - it is also an interference engine )