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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2007 cobalt LS 2.2L 4 lug wheels no ABS 1. front rotors &

Customer Question

2007 cobalt LS 2.2L 4 lug wheels no ABS
1. front rotors & pads replaced in Sept 16 due to low fluid light
(101,000).
2. master cyl & power booster replaced after running it out of fluid
Feb 17 (106,000). leaking into booster.
3. car not driven til June 17 because of legal problems. After driving for 5 miles or more, front wheels get very hot and steering begins to shake above 40 mph. Replaced rotors & pads again due to high heat. Also calipers, front brake hose & front wheel bearing hubs. Rotated tires & bleed brakes. Still does the same thing. Brake pedal is low. Do I have a proportioning valve problem, master cyl, booster issue. Thanks, Jeff
Submitted: 2 months ago.
Category: Chevy
Expert:  david craig replied 2 months ago.

Hi Im David, thanks for visiting the site.Does it feel like the brakes are grabbing?

Customer: replied 2 months ago.
no, brakes are great
Expert:  david craig replied 2 months ago.

so are you concerned about the steering or the low pedal. they are unrelated.

Customer: replied 2 months ago.
It seems like after driving at speed (50+) for 5 min or more that the front brakes are dragging creating all this heat in the front wheels. That is when the steering starts to shake. I think it is a brake issue.
Expert:  david craig replied 2 months ago.

ok, that sounds like you ave deteriorated hoses, that are breaking down under thermal conditions and the inside of the hoses are flaking, and acting like a check valve. but I see you replaced the hoses?

Customer: replied 2 months ago.
Thought the same thing after all that new fluid was introduced into the system.
Expert:  david craig replied 2 months ago.

is the brake pedal sinking by itself at all?

Customer: replied 2 months ago.
Very little if any
Expert:  david craig replied 2 months ago.

sinking to the point of maybe slightly applying the brakes?

Expert:  david craig replied 2 months ago.

let me look into to the history of this issue

Customer: replied 2 months ago.
ok
Expert:  david craig replied 2 months ago.

ok, this is always a concern, especially if the lugnuts are put on without a proper rated torque stick. mechanics love using their 650 pneumatic impacts without torques stick making the lugnuts extremely over torqued.

Customer: replied 2 months ago.
no. I use a Craftsman torque wrench, 100 ft lb
Expert:  david craig replied 2 months ago.

ok. good.

Expert:  david craig replied 2 months ago.

Here some more things to look at

Customer: replied 2 months ago.
Cobalt is not here now. I will be looking into master cyl/booster issues. I had a shop about 30 miles from here do that work.
Expert:  david craig replied 2 months ago.

ok, please let me know if you need further help with this

Customer: replied 2 months ago.
I will David
Expert:  david craig replied 2 months ago.

ok. cool

Expert:  david craig replied 2 months ago.

hows it going?