The other the day I noticed some fluid on the driveway were I park my HHR.
The only fluid I found to be low was my brake fluid, my pedal pressure is fine, good solid feel, no low pedal when the brakes are pressed into service.
I did a search here but can't find any directions on how to change the reservoir !
I did find the TSB about the cold weather affecting the brake fluid and the part number for a kit to replace the reservoir GM Part # 15939572.
From what I see I need to remove the fuse panel and then the master cylinder to move it forward to clear the air conditioner plumbing then remove the retainer bolt to pull the plastic tub up and spill brake fluid onto the paper towels I'll place under it
Any I site into this would be a great help! I can't lean over the fender for very long to do this!

 

First be sure it's leaking. The level drops as the pads wear and the caliper pistols extend.

Second you have to remove The fuse box to get to the MC. I think the reservoir just sits on an O-ring. Give me some time to be sure.

 

I checked the pads, they only have approximately 2,600 miles on them. rear brakes are adjusted. I called two GM dealers parts guys I have worked with for over 30 years , they both said they have never had one in inventory or sold the GM Part # 15939572 kit. or put over the counter for warranty

 

There is a pin or screw accessible from the driver side bottom of The tank, then 2 O-rings.

I would think a leak would be from the O-rings not a busted tank.

 

I ordered the tank kit , it provides the orings and low fluid sensor.

 

Steve. Got a part number for that kit ? It might be one we should add to our parts numbers sticky.

 

The part number for the kit is in post #3.