When starting out from a stopped position it sounds and feels like the rear end is going to fall apart very loud.
Have you raised the back of the truck and had someone run the truck in place to verify the source of the noise ?
SOURCE: 2005 GMC Sierra 1500 rear noise
you need to check you universal joints usualy the one on the rear axel is the first to go. i recomend to put bolth in at the same time. the new ones will be greasable so dont forget to give them a little every oil change
SOURCE: GMC Sierra rear brake pads
make sure piston is pushed all the way into caliper. if it is install without shims
SOURCE: 2003 sierra rear brake rotors
there is many kind of brake system of ur truck here i will send u everything about the brake and i hope its help
Rear Brakes JC3
Rotor Discard Thickness*
18.50 mm/0.728 in
Rotor Minimum Allowable Thickness After Refinish
19.0 mm/0.748 in
Rotor Thickness (new)
20.0 mm/0.787 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in
Rear Brakes JC4
Rotor Discard Thickness*
28.50 mm/1.122 in
Rotor Minimum Allowable Thickness After Refinish
29.0 mm/1.142 in
Rotor Thickness (new)
30.0 mm/1.181 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring1
.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in
Rear Brakes JH2
Rotor Discard Thickness*
28.50 mm/1.122 in
Rotor Minimum Allowable Thickness After Refinish
29.0 mm/1.142 in
Rotor Thickness (new)
30.0 mm/1.181 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in
Rear Brakes JH6
Rotor Discard Thickness*
27.50 mm/1.082 in
Rotor Minimum Allowable Thickness After Refinish
28.0 mm/1.102 in
Rotor Thickness (new)
29.0 mm/1.141 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in
Rear Brakes JH7
Rotor Discard Thickness*
28.5 mm/1.122 in
Rotor Minimum Allowable Thickness After Refinish
29.0 mm/1.142 in
Rotor Thickness (new)
30.0 mm/1.181 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in
* All brake rotors have a discard dimension cast into them. Replace any rotor that does not meet this Specification. After refinishing the rotor, replace any rotor that does not meet the minimum or discard thickness specifications.
SOURCE: Grinding and rattleing sound on the brakes of a 99 Gmc Sierra
If the brake peddle went to the floor it is indicating either a faulty master cylider or there is a breach in one of the brake lines. check the brake fliud for a low level and look for any leaks around the complete area of the ground under the truck for a stained road surface this will point you in the right direction inregards to where the rusted brake line or broken rubber brake hose is located, as for a grinding sound when applying brakes sometimes the inner pad and rotor surface is hard to inspect because the veiw is obstructed by the splash guard on the inner side of the rotor and brake caliper/pad assembly, the only effective way to check the rotors and pads is to remove the calipers and inspect, some guys use a small flashlight to peer through the small gap in between the caliper an spash shield to try to see the condition of the back surface of the rotor I don't prefer this method I like to be thourough. By the way a simple test to check the master cylider is as follows, with truck in park and engine running slowly agently push the brake pedal down if it goes nearly to the floor the master cylinder needs replacing especially if the brake fluid reservoir has not lost any fliud.
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