Hyperspeed97z28

Hi all,

I have a 97 Z/28 Six Speed

Today the ABS INOP Light Came on, I scanned it and got " C1242 "

Rear Esb Will Not Hold Motor ???? What the hell does that mean ???

Please help

Thanks in Advance

Mikey97Z

From the F-bod manual:

The Expansion Spring Brake (ESB) is used to hold the piston in the upmost (or home) position. An ESB is a spring that is retained in a housing at a close tolerance. One end of the spring is in contact with the motor drive dog and the other end is in contact with the pinion drive dog. In normal braking, brake pressure is present on the top of the piston, applying downward force. The force applies a counterclockwise torque to the motor pinion which tries to rotate the spring counterclockwise. The counterclockwise torque expands the spring ******d within the housing and prevents gear rotation.

When the motor is turned on and tries to drive the ball screw nut, the end of the ESB in contact with the motor drive dog rotates inward causing the spring to contact in its housing allowing the motor to rotate the modulator gear.


Geez, just when you thought you knew it all, dog.


EDIT: Why the hell is 0utw@rd censored?

Hyperspeed97z28

So in terms I can understand... What is broken ???

Dave89IROC

sound like a purely mechancal problem, internal to the ABS hydrualic unit

Mikey97Z

Does this help? I photographed a couple pages from the manual:

http://z28.reanimator.org/abs_esb.jpg (2Meg image!)

Hyperspeed97z28

That kinda helps, I am still unsure to which piece needs replacing ???

Mikey97Z

It's inside the ABS Brake Modulator / Motor Pack Assembly.

You have to take out the ABS unit and open it up. ewww.

Hyperspeed97z28

Cant I just replace the whole unit ???

Is this the box on the drivers side where the CAI hits during install ??

Mikey97Z

Yes, that's it. It sounds kinda expensive!

Hyperspeed97z28

Thanks for the help man !!

Any clue on what the Actual name of the part is ???

Mikey97Z

Yeah those are the real names.

The "box" with the brake lines and wires is the ABS Brake Modulator / Motor Pack Assembly. There are 3 motors inside and each motor has an ESB and one's broken.

Getsome17

I say take it apart and find out what is wrong with it. The only part that is a pain in the *** taking it apart is having to bleed all of your brakes again.

Hyperspeed97z28

Well if it is easy to do, I rather do that....

Can anyone lead me to which is the rear esb ??

Thanks

Hyperspeed97z28

I ordered a new motor/and abs pack. Got a used unit for $33 to my door !!!

I figure I'll just replace the whole unit !! Seems easy enough !!

Thanks for the help !!!!

My Iroc Z28

hate to bring up a old thread, but i was doing my LS1 brake swap and this code poped up and won't disapper no matter how many times i delete it.. it comes and goes when it's ready what did you do to fix it? and could possibly bleeding the brakes help? also the catch is that the red brake light and the trac light does not come on when this code pops up only the abs light this is something that i don't understand according to alldata and the pic of the book above it says it should but it doesnt im lost