OK, got an 88TC and both the brake and antilock lights are lit up in the dash. The pedal is like a rock, although, occasionally it will work properly. I have checked the connectors, but dont know how to troubleshoot the teves system. Is there a test point to see if it is pressurizing? Does anyone have a wiring diagram??
Try this: http://www.turbotbird.com/techinfo/TEVES%20II%20ELECTRO-HYDRAULIC%20BRAKING%20SYSTEM%2087-88%20TCs.htm
Sounds like an accumulator problem.
Make sure the pump is running when you turn the key to run,othwise check your relays.
+2
The relay failure is common... Mine didn't operate 3-4 years ago, smacked it with my tennis shoe, been fine since(I do carry a spare relay in the console)...
Has twice been my experience that a bad accumulator results in normal pedal feel on light braking, but pedal gets hard on heavy braking, at least until the pump kicks on and rebuilds pressure...