Quote:
Originally Posted by j cAT
the power steering pump is the power generator. these gm pumps have a very common defect where the pump pulley shaft breaks internal to the pump. when this occurs you loose braking and steering.
In your case the brake pedal pulses. this would be the ABS. remove the abs fuse and see if this changes. have vehicle ABS codes checked. if any found post here .
normally the ABS will only pulse when the vehicle is moving , not on first starting the engine.
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Maybe I haven't communicated properly. I'm not really getting any pulsations in the pedal, I really don't think it's an ABS problem. I always was in the habit of putting my foot on the brake as I start the vehicle, a carry over of starting procedure from a past vehicle that I owned that required that sequence. So when i would start the engine, with foot on the brake, I would get one quick "stab" in the foot as the pedal got very hard. I always thought this was normal. Also, when driving, if i hit the brake pedal fast and hard, I would also feel that hard resistance kick me back, giving me a wonderful, hard brake pedal and fantastic braking with little pedal effort. Now, it feels like a normal brake pedal without that rock hard feel, and it also requires higher pedal pressure and I have noticed that with repeated pushing, the pedal goes down. I just don't know how the Hydro boost is supposed to work. I took it to a tech yesterday who owns a 2004 Yukon and he thought the pedal felt good to him. What I do know is that something is different. Today looking at it, I noticed some oiliness on the bracket below the master cylinder. There also appears to be an oily mist on the firewall at the rear of the Hydo B unit. I would guess that's significant in some way.