I want to replace the front rotors on my 1987 Chevrolet Silverado 1500 4 wheel drive

Two other things to check: alignment and wheel balance.

Possible brakes are worn out and grinding on brake rotor

2 wheel drive?? remove dust cap cotter pin and remove bearing holding nut , the rotor hub assembly is all one piece

Front (4 Wheel Drive) To Remove:

1. Raise and support the vehicle
2. Remove or disconnect the following:
   • Tire and wheel assembly
   • Rotor (See: Disc Brake Rotor)
   • Wheel speed sensor and brake hose mounting bracket bolt from the steering knuckle
   • Electrical connection for the wheel speed sensor
   • Front drive halfshaft assembly (See: Halfshaft)
   • Hub and bearing assembly mounting bolts 4WD front hub
     
     
   • Hub and bearing assembly

To Install:

1. Clean all corrosion or contaminates from the steering knuckle bore and the hub and bearing assembly
2. Lubricate the steering knuckle bore with wheel bearing grease or the equivalent
3. Install or connect the following:
   • Hub and bearing assembly
   • Hub and bearing assembly mounting bolts and tighten the hub to knuckle bolts; Torque to: 133 ft. lbs. (180 Nm)
   • Front drive halfshaft assembly (See: Halfshaft)
   • Electrical connection for the wheel speed sensor
   • Wheel speed sensor and brake hose mounting bracket bolt to the steering knuckle and tighten the bolt; Torque to: 106 inch. lbs. (12 Nm)
   • Rotor (See: Disc Brake Rotor
   • Tire and wheel assembly
   Wheel lug nut tightening sequence
   
   
4. Torque the lug nuts to specification
5. Test drive the vehicle to confirm the repairs

it probably need a mode selector switch.

I would say that you have a rotor issue. The rotor is the part onto which the brake pads press and apply braking force. You may have front wheel disk brakes or all wheel disk brakes. I would take the vehicle to a reputable brake specialist and have them check the rotors for wear and a condition called "run out". If the rotors are not worn past the manufacturers specs, you can have them machined which will bring them back to true and prevent the shakes. If the rotors are worn, then replace them as worn rotors can shatter causing total loss of braking and control which can be dangerous.. Do this as soon as you can...

2 or 4 four wheel drive?

The rotor and hub assembly are held together by the studs,you must first remove the 4-wheel drive hub assembly,then the wheel bearing nuts,and pull the hub and rotor off as a unit. Next lay it(back down) on a piece of wood, using a drift punch drive the studs out. Turn it over ,lay it(face down) on a block of wood, line the new stud splines up with the grooves in the hub and drive them in with the punch and reassemble. A set of dentist style picks will be helpful with the clip in the 4wd hub and a 4 lug 4wd nut wrench will be needed.

Remove caliper and nut to axle should come of with a little help of a rubber hammer. Knock bolts out from the front and drive new ones in from the back. You can use a lugnut with the flat side down to help pull them in and a hammer to help. Hope this helps.

There are a couple of things to check. Linkage, control arms, idler arms, inner and outer wheel bearings, warped rotors, tire misalignment etc...

anaanymous