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Mike S.
Mike S., ASE Certified Technician
Category: GMC
Satisfied Customers: 6925
Experience:  GMC N.A.I.S.E. Certified Auto-Mechanic
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How do you bleed the Kelsey 4WAL unit on a 1998 SONOMA 2WD

Customer Question

How do you bleed the Kelsey Hayes 4WAL unit on a 1998 SONOMA 2WD pickup
Submitted: 1 year ago.
Category: GMC
Expert:  Mike S. replied 1 year ago.

What method of bleeding were you using, a vacuum pump, a pressure bleeder or the foot on the brake pedal (manual) method?

Customer: replied 1 year ago.
Tried all three. Even tried opening right side rear bleeder hooked to catch can, for gravity to move fluid. Nothing is working so far.
Customer: replied 1 year ago.
Correction! I do not have a pressure bleeder. I did the vacuum and brake pedal method plus that gravity feed over nite.
Expert:  Mike S. replied 1 year ago.

Ok, it's been from my experience that using a vacuum pump cannot be done when there is a line replaced or something like that. It's just too much air I suppose. I brake pedal method is the best. Do you have someone else pumping the brake pedal? Here is a method I found works the best, ***** ***** the person pumping the brake pedal cannot make a mistake when you are yelling out, down, hold, up or whatever. Just loosen the bleeder and then hold your finger or thumb over the hole and have them slowly press the brake pedal up and down. Quickly might cause bubbles.

Or if you are by yourself, the ole method of attaching a hose to the bleeder and setting the end of the hose in a container or jar with brake fluid already in it so when you let up on the pedal it won't suck in air but brake fluid.

Other than that, if you still cannot bleed, check for a leak.