After ~20 miles of stop-and-go driving, braked at ~40 MPH to slow/stop for traffic 5- to 6 car-lengths ahead. Brake pedal sank to floor with little resistance, no slowing of vehicle. During body repairs, shop employee noted "spongy" brake pedal feel, `ineffective during hard braking'. Truck transferred to mechanic, who found brake master cylinder leaking from rear seal & reservoir gaskets - and also found all front pads worn `to the point of needing replacement'. Selling gm dealer replaced pads but denied m/c leakage, but second dealer (dutton gmc in riverside, ca) confirmed leakage and replaced m/c under warranty. 2,100 miles later, on 10/4/99, noted fresh fluid leakage at rear of m/c; when cap removed, new fluid had turned very dark; when replacing cap, noted fluid "squishing" from round seals between reservoir and m/c bore.
The worst 1999 Cobra Sierra problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Brakes1
Problems by type
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- Brakes1
Recalls
No recalls on record for this model year.
What 1999 Cobra Sierra owners say
Most recent owner complaints, unedited.
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Questions about the 1999 Cobra Sierra
Is the 1999 Cobra Sierra reliable?
Owners have filed 1 complaint about the 1999 Cobra Sierra, close to a typical Sierra model year.
What is the most common problem with the 1999 Cobra Sierra?
Brakes, with 1 complaint.
How many recalls does the 1999 Cobra Sierra have?
No recalls on record.
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