Tech II Brake Bleed
10-14-2012, 02:29 PM
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Tech II Brake Bleed After trying to bleed unsuccessfully both manually and with a power bleeder I was able to borrow a Tech II to bleed the brakes. Now I have read online that there is an brake bleed procedure that the Tech II walks you through but I am unable to find it in any of the menus. In the Special Functions menu (where I have read it should be) there is only Automated Test and Solenoid Tests, and neither go through the bleeding procedure.
Does anyone have experience with a Tech II and know the procedure for bleeding brakes on a 98? I looked through the service manual and it doesn't mention the brake bleed procedure either.
Does anyone have experience with a Tech II and know the procedure for bleeding brakes on a 98? I looked through the service manual and it doesn't mention the brake bleed procedure either.
10-15-2012, 12:03 PM
#3
I've done it on Escalade's(I'm a GM tech), never on an F-Body though. I'll bring the Tech 2 home tonight and see if I can find it on my 2001. It should be where you're looking though; Chassis-Special Functions.
10-15-2012, 07:34 PM
#4
im also a gm tech, and if i remember correctly, your gonna
wanna run the automated test, this way, it will run/cycle the
pump motor, essentially working all the air bubbles out, and
after this test, you will need to go to each wheel and bleed them
like normal..obviously keeping an eye on brake fluid level, with
the cap ON!..g.l.
wanna run the automated test, this way, it will run/cycle the
pump motor, essentially working all the air bubbles out, and
after this test, you will need to go to each wheel and bleed them
like normal..obviously keeping an eye on brake fluid level, with
the cap ON!..g.l.
10-15-2012, 08:57 PM
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Ok, after doing a bit of research this is what I have come up with...
The reason the brake bleed procedure isn't available for me is because my car is a '98. In '98, the Bosch 5.3 ABS unit was used then for '99+ the Delphi DBC-7 unit was used. The newer DBC-7 uses stepper motors to actuate the ABS pistons which is why it is able to cycle the solenoids and bleed the air out.
The bleeding procedure for a 1998 Fbody is outlined on page 5-38 in volume 2 of the service manual. It calls for pressurizing the master cylinder (to 35 psi! yikes!) and opening the rearward and forward ABS hydraulic modulator bleeder valve.
The reason the brake bleed procedure isn't available for me is because my car is a '98. In '98, the Bosch 5.3 ABS unit was used then for '99+ the Delphi DBC-7 unit was used. The newer DBC-7 uses stepper motors to actuate the ABS pistons which is why it is able to cycle the solenoids and bleed the air out.
The bleeding procedure for a 1998 Fbody is outlined on page 5-38 in volume 2 of the service manual. It calls for pressurizing the master cylinder (to 35 psi! yikes!) and opening the rearward and forward ABS hydraulic modulator bleeder valve.
