Recently has new whl bearings, brakes, rotors, pads, and callipers. going to try a new push button switch to eliminate that being the problem. my truck has a grinding sound in 2whl drive at 20-30 mph, when i select 4whl hi on the push button selector i can hear it engage but not certain if it is actually engaged same grinding sound as in 2whl also. when 4low is selected it sounds really bad... spline to spline grinding n never engages???
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Hi Danny jack up the car and use axel stands or blocks for safety remove wheels and open the calliper s. if the park brake cable is attached to the back of the calliper you will need a brake wind back tool. If not the pistons on the calliper should push back to make room for the new pads. Next remove the calliper brackets and then the rotors and reassemble in reverse order. Before you let the car back down pump the brake until its hard then turn the wheel by hand to see that it is free. After a road test jack it up again and make sure the wheels are still free. Have fun. Regards Jim...
if it is a disc brake then the callipers would have had to be removed to get the hub off to replace the bearings
This would have possible dislodged the brake pad and it may have fallen out from being put in properly.
When putting the calliper back over the disc rotor it is easier to move the piston back if the bleeder nipple is opened so it is possible that the nipple was not tightened properly after assembly
remove the wheel and check that there is a pad either side of the disc rotor and that the nipple is tight
A broken engine or tranny mount should not cause a front wheel to wobble. If this is happening with a grinding noise I'd expect more of a failing bearing or such. The grinding noise may also be a rotor of the brakes with poor pads. Yes, if a axel, or CV joint, is failing this can make noise too, often times a "clicking" type of noise. Best get the front of the van up on jack stands, remove the tires and inspect all of the front-end components; pay special attention CV joints, rotors and front axel area, loose movement in the axels?
I hope this may have helped,
the problem will be in the master cylinder compensating port blocked
disc brakes do not have return valves or residual line pressure like drum brakes
if at any time the heated brake fluid is not allowed to expand back into the reservoir it expands and pushes the disc brakes harder on
catch 22 situation
dragging pads generate heat , fluid expands and presses the pads on harder = more heat =more pressure
the rotors have to be running true ( no wobbles) wheel bearings have to be correctly adjusted or replaced and the calliper body has to move freely on the mounting pins to allow for self centering action
instead of the mechanic go to an accredited brake professional shop and have a proper diagnosis and quote done