ABS Pump issues

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Tom Danger Collins

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Oct 3, 2011
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Location
Houston TX
98 Z71 Tahoe Sport 2 Door here with 5.7 L

(This is my first post) The parking brake/brake problem light is on. The brake pedal is very spongy. When I try to put it into 4 HI or Low the tires bark every second or so but in 2 WD its fine other than the brake pedal. The guy at the brake place cannot bleed the air out, and we have been through 3 master cylinders. The last master cylinder is GM manuf. The brake repair guy said it needed an ABS pump. My questions are.....are the 4x4 issues related to the ABS system in the truck, or is it more likely to be an issue with the transfer case? How much trouble/cost in replacing an abs pump? :wtf2:

PS so far there are zero leaks from the tahoe on the garage floor and the brake fluid level is fine.
 
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