Question about Mercury Mariner
Replaced rotors around 4000 miles ago, just turned drums today and it still pulsates. there is no pulsation in the steering wheel. I can feel it when lightly pressing on brake pedal going any speed over 5 mph
Posted by Anonymous on
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Posted on Jan 02, 2017
What happens is if you have a bad front wheel bearing when you brake that wheel will turn in or out,when this happens it throws the four wheel alignment out and since this is a solid rear axle,it's forcing it to flex on the suspension,wich could cause the rear tires to bite on the outside edge of one tire and the inside edge of the other,thats one possible the other would be that the rear brakes are are not slowing the wheels evenly causing the same issue.I saw this problem with a bad front wheel bearing on a Nissan Pathfinder but not as pronouced due to the independent rear suspension. Check the front wheel bearings,which of course will mean getting the calipers off the rotors,and then check for any movement in the rotor,if there is check the hub nut,if it's loose tighten it and check for play in the rotor if there is still play that's going to be caused by a bad bearing.You can check the braking in the rear with a simple spring scale(like the ones used for fishing),with the wheels removed have someone apply enough pedal pressure to just engage the brakes but still allow movement attach the scale hook to a wheel stud and pull until it starts to move and note how many pounds of pressure it takes to move the hub.If it's uneven chech your adjusters and even them if needed and then retest,if still uneven you'll need to bleed them again.As far as the dark black substance in the fluid I would say you may gotten a contaminent in the fluid.Brake fluid gets kind of a rusty reddish residue when it breaks down.If I missed anything or you need clarification don't hesitate to ask I'm home all day.Hope this helps solve your problem.
Posted on May 05, 2009
SOURCE: brakes are pulsating in pedal.
Your rear drums are out of round (warped). Eventhough you turned them the problem will not go away because they have hot spots in them that turning can't remove. You need to replace them with new ones to solve this problem. Pulsing pedal is rear brakes and a shimmy in the steering wheel while braking is in the front brakes.. Good luck I hope this helps you out.
Posted on Jul 14, 2011
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