Quote:
Originally Posted by 1976gmc20
Thanks for the tip! I will go out and try that shortly.
The 89 pickup isn't a square, but it looks to be the same setup as my 91 suburban (which is "newer" but yet "older"  ). Only difference is the 91 has steel MC reservoir while the pickup is plastic. The suburban brakes are fine; I'm not sure if I've even replaced the pads in 18 years. |
Okay, I tried the quick stomp as per the video several times and no success.
I finally got the wire pulled off, and the light is still flashing so it's apparently something else. Otherwise brakes work fine and fluid level is staying steady. The parking brake is disconnected because the arm in the LR was destroyed and I haven't yet gotten to a junkyard to try to find another one. The part isn't available new so the shop put it back together without either one. I have the RR parking brake arm in my glovebox.
I compared these two trucks again, the 1989 GMT400 and the 1991 squarebody. The brakes are basically the same and both apparently have the RWAL as there is another device that the
rear brake line runs through that upon closer inspection has wires that connect to the flat module. Only difference other than the steel MC reservoir is that the 91 has the PV and RWAL devices mounted crossways under the MC and the 89 has them fore and aft.
If the RWAL works on either truck, it is undetectable when driving. Maybe I just never tried to stop that fast?