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usually if you cant feel a brake pulsation in the peddel or steering, its the rear brakes that may be out of true (warped) if disk. Also bad shocks will no longer dampen braking in rear.
check brake pads /shoes for lining thickness if drums check for ovality in the drums surface or disc condition
check rear end suspension rubbers and shockys.
check for correct operation of the brake portioning valve as the condition may be from the rear wheels locking up
if it has ABS braking it may be the braking action , a combination of the items to be checked that is causing the problem
wobbling from the rear end can be from worn suspension rubbers in the control arms. Normally it is from belt separation in the tyres and bulges in the side walls
I take it that it is a front wheel drive with no diff action at the rear.
another point may be that the rear brakes are grabbing ( out of round drums or warped discs) that is causing the vehicle to react as if the rear is loose.
sounds like to problems did you actually hit some thing? if not the burnt smell should go away. about the bounce at 45 mph are you sure that it's not a shake and does it go away at 55 mph or different speed? if this is whats happening the front tire is out of balance weight could have fallen off. try this
I believe this has drums on the rear. Do this test: Go 40, then listen for any change in grinding when you put on the brakes lightly then harder (try different things). If it changes, have your brakes looked at.
If no change, you might have a wheel bearing that is just beginning to go out. (At 40, it sets up something called a "sympathetic viberation" which makes the grinding much louder at 40 than any other speed.)
I'm not sure myself but do this test, find a baron stretch of road and drive up to 40 mph, then apply the brakes very firmly to try and lock the front brakes, you will notice 1 of 2 things, if the tires lockup and screech then no ABS, if you get a grinding pulsing action that doesn't sound good, then yes you have ABS, this action allows the wheels to continue to rotate to a certain degree. Good luck
do you feel any vibration when braking at lower speeds like 30? if any vibrations happen only when braking, fix those first. I suspect there is a rear brake problem. also verify that the driveshaft and universal joints are good.
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