I sold my old beloved Omni GLH Turbo to my older brother, but I still take care of it (warranty haha).
He recently told me that the brakes need to be bled. He described the problem and it sounds to me like he was having a problem with braking on icy roads on the way home on the highway with premature brake lockup.
I've driven the car recently, and it has a nice firm pedal. It's just fine when it's dry, but gets a little hairy with bad weather.
The brake system consists of:
Fronts: SLH III package front brakes from an '89 Caravan. 10" plain vented disc (similar to stock), Single pin KH calipers with 60mm piston and Raybestos PG+ pads.
Rears: Vented rear discs from a Spirit R/T. Plain 11" vented rotors with Raybestos SuperStop pads.
Hydraulics: 24mm MC, braided steel line set from FWDP. Proportioning valve is from a 4-wheel disc car. DOT 4 fluid.
My gut feeling is that there is simply too much rear brake bias. I have thought of a few options to correct this:
1. Reinstall stock drum brakes. I would have to locate all the parts because I no longer have them.
2. Install smaller 10" solid rear discs. I have the parts.
3. Install even larger front brakes to induce more balance. I have the parts for this as well, from a Spirit R/T.
4. Buy two adjustable prop valves and all the work plumbing them in and dialing them in.
5. Install the cheapest non-aggressive rear brake pads ever.
What would you do? Personally I like option #3 but...maybe a very non-aggressive rear pad could be the easiest fix here? Back when I delivered pizza in the car, I was aware of the brake bias and had lots of fun initiating a drift down Foothills Blvd 'corkscrew' by just jabbing the rear brake. It was fun as hell and the car never got away from me......but now my brother owns the car and it is mostly highway driven to/from work.