Brake line, hose or caliper failure on the 2003 GMC Sierra 2500
1 crash 1 fire 1 injury 3 of the 15 reports for this failure mention a crash, a fire, an injury or a death. Those are the owner's words on the complaint form, not a verified finding, and one report can mention more than one.
When brake line, hose or caliper failure gets reported
Owners of the 2003 GMC Sierra 2500 report brake line, hose or caliper failure at a median of 85,000 miles. A quarter of the reports come in before 65,000 miles and a quarter after 110,000 miles, from 15 reports that carried an odometer reading.
A part like this is normally expected to survive 115,000 miles. It is the 5th most-reported problem on this model year.
The mileage distribution
The reported range runs from 50,000 miles at the tenth percentile to 170,000 miles at the ninetieth, a spread of 119,647 miles across the middle 80% of reports.
A spread this wide points at use rather than design. Towing, climate, service history and city mileage all move a failure like this, so the median is a weak guide to any individual car.
0% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 50,353 miles | 67,350 miles | 83,000 miles | 109,228 miles | 170,000 miles |
Read the 10th percentile as “one report in ten arrived this early”. Exact figures are shown in this table because it is the table of record; everywhere else on the site they are rounded to the precision the sample can carry.
What a percentile can and cannot tell you here
These five numbers describe the readings owners gave, in order. The median is the middle one: half the reports arrived below it. The 10th and 90th are the edges of the bulk of the distribution, and the distance between them is the part worth reading. A tight spread — say 70,000 to 95,000 miles — points at something that wears out on a schedule, and the schedule is knowable. A wide one, 20,000 to 190,000, points at a fault that hits some cars and never troubles others, which means the mileage on the listing in front of you tells you very little about your odds.
What these figures are not is a survival curve. Every reading here comes from a car whose owner filed a complaint, so the sample contains only failures: it cannot say what share of the fleet made it past 150,000 miles untouched, because those owners had nothing to report. Nor is the mileage the moment of failure — it is the odometer reading as recalled at the time of filing, which may be weeks later and is sometimes rounded to the nearest ten thousand by the person typing it.
Percentiles are shown at all only once 8 readings exist for the vehicle and mode. Below that the middle of a handful of numbers is noise wearing a decimal point, so the figures are withheld rather than dressed up.
What happens, and what it costs
Of these reports, 1 a crash, 1 a fire and 1 an injury are mentioned. Owners write their own complaints and the agency does not verify them, so read this as what the reports say happened rather than as a confirmed count.
Putting it right typically runs $250–$1,600 at an independent US shop. That range is an editorial estimate held in this site's failure-mode catalogue, not a figure from NHTSA, and it is a repair cost rather than a diagnosis cost.
This mode is classified as critical, which means a failure can leave the car unable to stop, steer, or stay out of the way of traffic. It is weighted accordingly in the risk score.
The same failure on other years
The same failure is reported on 8 model years of this car. It shows up earliest on the 2006, at a median of 40,000 miles, and latest on the 1999 at 170,000 miles.
By volume the 2003 is the worst of them, which makes this a problem of this specific year rather than of the model as a whole.
If one year stands out to the left, that is the year to avoid; if the whole line sits at a similar mileage, this is wear rather than a defect in one production run.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
During an emergency stop on highway from approx. 45mph, due a tractor trailer suddenly stopping, ABS brake system started to fluctuate, but truck did not stop normally. Avoided collision by veering to side of road. Left front brake line, at clip near wheel, leaked brake fluid thereby preventing quick stop. Brake pedal went to floor afterwards, there was seemed to be no secondary hydraulic system pressure for rear brakes. Emergency brake was hardly effective.turns out all brake lines are severely corroded in nearly all areas, even under hood. Truck has 50,000 miles and is 6 years old. Have also previously experienced sudden power steering failure due to power steering line corrosion and fluid loss. Power steering system provides hydraulic boost for brakes, therefore brakes are impacted also. Brake and power steering lines seem to be made of steel with incorrect or poor alloys, thereby acting like a sacrificial anode on the truck, as evidenced by the rust throughout the lines, vs. Localized rust. Brake lines and power steering lines have been replaced. Still have several rusty lines for inspection if needed. *tr
2003 gmc sierra denali with brake line failure problems. *tgw the consumer complained of a very soft pedal and sometimes the pedal would go to the floor before stopping. The dealer claimed nothing was wrong. The consumers wife was driving the vehicle and when she applied the brakes, on an incline, she traveled backwards out of control and struck the neighborhood sign. She experienced neck and back pain. The consumer arrived at the scene to find massive amounts of brake fluid dripping down the frame from one of the brake lines located on the drivers side. The consumer was informed the brake lines had excessive corrosion and failed. The consumer stated when he attempted to stop, the brakes completely failed. The brake lines were rusted with a hole completely through. The consumer stated the right rear brake line was replaced under warranty. The second time the incident happened the dealer replaced the entire brake line system. *jb
I was driving my '03 gmc sierra 2500hd on a highway at approximately 65mph, when I had to slow down, to avoid hitting a vehicle slowing down in front of me. I stepped on the brakes, no harder than I normally would, and the pedal went all the way to the floor, with very little to no stopping action from the brakes. I was able to slow down by downshifting the automatic transmission and using the emergency brake to stop, while pulling onto the shoulder. My truck had to be towed to a repair shop, where it was determined that the rear brake line along the drivers' side frame rail had ruptured due to corrosion. My emergency brake assembly also had to be replaced due to excessive rust on it, as well as defective brake shoes. The total cost to repair the brake line came to approximately $450.00, and the emergency brake replacement came to around $900.00. The rest of the brake lines are also very corroded, and should be replaced. I was quoted a price of $1,450 to replace the remaining brake lines on the truck. *tr
Also reported on the 2003 GMC Sierra 2500
Other brake problem
Loss of braking
Other electrical problem
Instrument cluster or gauge failure
Other fuel system problem
Rust or structural corrosion
How far this goes
Complaints are voluntary, so 15 is a floor and not a count of affected cars. Mileages are typed in by owners and cluster on round numbers. And the mode itself is assigned by software reading the complaint text, which is reliable in bulk and fallible one report at a time.
Questions this page answers
At what mileage does brake line, hose or caliper failure happen on the 2003 GMC Sierra 2500?
Across 15 owner reports that included an odometer reading, half were filed by 85,000 miles. A quarter were filed before 65,000 miles and a quarter after 110,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is brake line, hose or caliper failure on the 2003 GMC Sierra 2500?
15 reports have been filed with NHTSA, about 27 per 1,000 vehicles. Complaints are voluntary, so this is a floor rather than a count of affected cars.
What this is and is not. These are the mileages at which owners chose to complain to a federal agency, which is not the same as the mileage at which the part fails on every car. It skews toward failures that happened outside warranty, cost real money, or frightened someone. It is still the only public dataset that carries failure mileage at all, and the shape of a few hundred readings is informative even when a single one is not. Methodology · JSON · this failure on other cars
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed