What is the control box attached to the master cylinder for?

carzan · Apr 24, 2017

The truck is a 1990 Silverado with a 5.7, automatic, 2wd.
It has two connectors.

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GaryCCR · Apr 24, 2017

I have a 96, mine doesn't have it. I think that's for your ABS.

shamrock246 · Apr 24, 2017

Rear ABS.

carzan · Apr 25, 2017

that's impossible the truck does NOT have ABS

(that is what I thought)

jkeaton · Apr 25, 2017

Yes. Its the ABS module.

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carzan · Apr 25, 2017

After looking very closely, it does have the extra bits. Attached is a pic of what it looks like on my 1990.

So .....how does the darn thing work? where does it get its data from?

If it is working properly would one ever feel a pulsing of the brake pedal when activated?

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Trenton Sauer · Apr 25, 2017

My gmc is a 1991 and it has that same box it is your abs controller mine does not work I just left it hooked up and didn't mess with it. It wont hurt anything. I wouldn't worry about it.

jkeaton · Apr 25, 2017

Same here. I removed the ABS idiot light bulb out of the cluster after replacing both sensors and never getting the light to go out.

Mountianjustice · May 10, 2017

carzan said:
The truck is a 1990 Silverado with a 5.7, automatic, 2wd.
It has two connectors.
You must be registered for see images attach

Remove the black plastic box and the aluminum block with the lines that's bolted to the bracket what your left with is an empty hole in the bottom of the valve on the master cylinder and the single rear brake line sticking up from the bottom.

screw them together and bleed the rear brakes. If done correctly I can promise you the best brake your truck has ever had and you will never see the abs light again except at start up. I'll get some pics tomorrow showing how it works but just rip all that **** out and have amazing brakes like you think your truck should. No more spongy brake pedal

Ruger_556 · May 10, 2017

To the OP, if the ABS goes active the brake pedal will push back at you and "vibrate" but not really like in newer cars.

Mountianjustice said:
Remove the black plastic box and the aluminum block with the lines that's bolted to the bracket what your left with is an empty hole in the bottom of the valve on the master cylinder and the single rear brake line sticking up from the bottom. screw them together and bleed the rear brakes. If done correctly I can promise you the best brake your truck has ever had and you will never see the abs light again except at start up. I'll get some pics tomorrow showing how it works but just rip all that **** out and have amazing brakes like you think your truck should. No more spongy brake pedal

If you have spongy brakes it has nothing to do with the ABS controller. Delete it if it makes you feel better but it makes no difference. This comes up all the time on the forum, delete this, upgrade that, bigger whatever... Might as well light your money on fire doing that stuff. The brakes on these trucks work, if they don't feel right there is something physically wrong with them that needs to be fixed.

Now Fords of this era do have legitimately spongy brakes but that's another discussion... :lol:

What is the control box attached to the master cylinder for?

carzan

Newbie

GaryCCR

OnlyBodyStyle enthusiast

shamrock246

I'm Awesome

carzan

Newbie

jkeaton

It’s been real

carzan

Newbie

Trenton Sauer

OBS Enthusiast

jkeaton

It’s been real

Mountianjustice

Newbie

Ruger_556

I'm Awesome

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