Let me start by saying I’ve spent the past several days digging through nearly 20 years of posts on the AC Delco ABS systems, both here and on TLF. At this point, I feel like I’m fully immersed in the problems and nuances of this setup.
I’m also fortunate enough to have one of Ian’s big brake kits sitting unopened in the box. That will always be my last resort, but before I go down that route, I want to see if I can get the Delco system working properly, or at least working as close to how it was intended as possible.
Where I’m at now:
I’m also fortunate enough to have one of Ian’s big brake kits sitting unopened in the box. That will always be my last resort, but before I go down that route, I want to see if I can get the Delco system working properly, or at least working as close to how it was intended as possible.
Where I’m at now:
- Car is new to me (had it a few months) and I’ve been working through various issues.
- I’ve had an intermittent flashing ABS light since day one. On my last 50-mile drive, the light didn’t come on at all.
- When hooked up to Espritmon, if I pump the brakes I can sometimes trigger the ABS light and get error 62 (low accumulator). I understand this can be caused by the pressure switch or the accumulator itself, and I know how scarce the switches are.
- My plan is to try cleaning the switch first. I’m waiting on a crows foot wrench so I can remove it carefully—I don’t want to risk damaging it since replacements aren’t exactly available at AutoZone.
- After depressurizing the system, the pump runs for ~37 seconds before cutting off. I also get about 2–4 pedal pumps before the pump cycles, which seems to be within the “normal” range.
- Today, I depressurized the system and opened the reservoir for the first time. The rear reservoir looked cloudy (fine air bubbles or maybe contamination?), while the front reservoir looked normal/clear.
- Could bad/contaminated fluid in the rear reservoir cause issues that would trigger error code 62?
- I plan to bleed the brakes. I’ve always used a power bleeder on my other cars, but obviously that won’t work with this system. I’ll be using a check-valve bleeder for the process. The manual states that the rears are bled under pressure. The service manual doesn’t explicitly state that the reservoir cap must be refitted before bleeding the rear brakes, does it matter? Is it okay to pressurize the system with the reservoir cap off, or will that just make a mess?
