can i bypass the brake lines going to the valves under the master cylinder, and hook up direct on a 91 gmc?

Terry Wayne Cooley

Asked by Mar 30, 2013 at 08:12 PM about the GMC Sierra 1500

Question type: Maintenance & Repair

5 Answers


Are you eliminating the ABS?

Terry Wayne Cooley

Yes tenspeed just doing away with both valves and hooking direct to master cylinder.

Michael Tutty

If you are eliminating the ABS, you need to start from scratch including a new proportioning valve. I would go to a place like Stainless Steel Brakes and get a complete tubing set, including flex lines and proportioning valve and a new master cylinder, and start from scratch, since the system components you have are all designed to work with the rear ABS that was standard or the 4 wheel ABS that was optional.

1 out of 1 people think this is helpful.

Why would you want this? fear of high-pressure?

Michael Tutty

If the truck has the rear wheel only ABS and the electronic controls have failed, it may be IMPOSSIBLE to repair. I know someone needed the control box, about 3 years ago, and there were only 3 left then. Chances are a new one is unobtainium, which is the problem with a lot of the electronics in the more modern vehicles. Once the supply is gone, unless some company makes after market replacements, the finite supply runs out, and you have to jerry rig a way around it.

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