So the uncertainty over the brake setup continues:
I have two new servos - one is the smaller type 50 (probably STC2878, which corresponds to NRC4775); this fits onto my original pedal box (probably NRC6058). The other is larger (LR013488 / STC441) and does not fit onto the pedal box, the holes for the servo studs are way off.
I have two new master cylinders - one is the larger pre-rear disk variety (NRC8690), which fits onto the smaller STC2878 servo. The other MC is LR013018 (STC441), which fits onto the larger servo, LR013488 (STC442); it does not fit the smaller servo.
I'm aware there is a pedal box that was fitted to later 110s, which is NRC7933 (LR010403). I'm wondering if I need this, or if I can simply drill new holes into my pedal box.
Confused.
My 1989 90 has disks on the rear. The MC is NRC8690, and the servo is STC2878. It also has a G valve on the bulkhead support bracket, which looks like a 90 thing rather than a 110 requirement.
Google reveals that some people stick with the larger servo, and either remove or retain the PDWA. Those who remove it also put the 300tdi MC cap on the earlier MC and adjust the wiring accordingly.
I see that there are a few options:
1. Retain the smaller servo (STC2878) and larger MC (NRC8690). Fit to 300tdi MC cap and adjust the wiring. Ditch the PDWA. Fit a T piece for the front calipers. Hope for the best.
2. As above but retain the PDWA and don't fit a T piece.
3. Drill the pedal box and fit STC441 and STC442; possibly fitting ANR1415 too.
4. Get a new/second hand pedal box and fit STC441 and STC442; possibly fitting ANR1415 too.
I'll post this elsewhere in the forum to see if I can gain greater visibility