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vibration when braking

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Old 09-16-2007, 03:17 PM   #1
hotrod351
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Default vibration when braking

im getting a vibration when braking above 50 mph. i have replaced everything, inner and outer tie rods, idler arm and even the control valve and steering ram. the only thing that made any difference is when i aired up the tires from 32 psi to 44 psi. that felt like it got rid of half of the vibration. took it to the alignment shop and they said the control valve had to much play in it so i changed it and the steering ram out but no difference. the tires are in really good shape and have plenty of tread left on them. any thoughts.
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Old 09-16-2007, 03:25 PM   #2
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Default RE: vibration when braking

Do you have front disc brakes?? if so it may be time to have the rotors turned down and replace the pads
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Old 09-16-2007, 03:40 PM   #3
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Default RE: vibration when braking

yes i have the front disc brakes. i did the calipers and shoes a year or so ago but never touched the rotors. i wounder what the runout should be.
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Old 09-16-2007, 03:56 PM   #4
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Default RE: vibration when braking

rotors are worped check your wheel bearings while your in there.
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Old 09-16-2007, 05:20 PM   #5
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Default RE: vibration when braking

Quote:
rotors are worped check your wheel bearings while your in there.
Warped rotors when you brake will cause more trouble than reentry from space. See if they are salvageable and buy new pads too.
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Old 09-16-2007, 06:16 PM   #6
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Default RE: vibration when braking

Yeah, sounds like warped rotors
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Old 09-16-2007, 06:40 PM   #7
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Default RE: vibration when braking

If the rotors are in good shape, then they should turn down right away. Don't forget that a tire can be bad. You may try to rotate the front to back and see if that helps.
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Old 09-16-2007, 06:44 PM   #8
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Default RE: vibration when braking

well that was my first thought, the tires. but the tire, alignment shop, insisted the tires were good, figures, after all they sell the tires. i checked the run-out and its under 5 thousands. im going to switch the tires rear to back.
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Old 09-16-2007, 06:49 PM   #9
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Default RE: vibration when braking

I would say most definatley rotors as well. Thats the one downside to discs. If they get hot they will warp and cause vibrations.
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Old 09-16-2007, 06:53 PM   #10
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Default RE: vibration when braking

That's why you get good discs and pads, and bed them in properly.
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Old 09-16-2007, 07:03 PM   #11
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Default RE: vibration when braking

Bet you a dollar to a doughnut it's your rotors...
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Old 09-16-2007, 07:10 PM   #12
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Default RE: vibration when braking

Also, do NOT tighten your lug nuts with an impact gun, even with those supposed "torque sticks" or whatever crap they call them now. On most setups that'll warp the hub and along with it, the rotor. That'sone of the biggestcauses of warped rotors on most cars, the wheel jerks zip up the lug nuts instead of torquing them
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Old 09-16-2007, 07:28 PM   #13
67 evil eleanor
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Default RE: vibration when braking

Something else poped in my mind. A loose wheel bearing can cause a vibration at that speed (said by andrew).Earlier when I said bad tire, maybe a broken belt or seperationthat can not be seen but amplified during braking.Let us know what the fix is.
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Old 09-16-2007, 08:18 PM   #14
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Default RE: vibration when braking

i torque them down to 110 lbs with a proto torque wrench. i did a run out with a dial gauge and have under 5 thousands. i did see some imperfections in the spindle castings, could be cracks. ill have to rotate the tires and check it out again. first the mech. said it was my steering stabilizer rubbers, they are squeezed out. then he said it was my pitman arm. i told thats nuts, the pitman arm would have to be cracked, the excess play was in the control valve pivot ball. well thats all new now, not really that bad of a job, but not the problem, i say tires or somehow the master cylinder is pulsing. the power brake booster and master are pretty new. everything ive done has helped but the thing that made the biggest difference is when i aired up the tires from 23-44 psi, that what the max pressure said on the side of them. that cut the vibration in half.
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Old 09-16-2007, 11:25 PM   #15
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Default RE: vibration when braking

Could be the tire itself too. When you brake it increases weight on the front tires, maybe it's got a belt that's failing and the tire flexes when you brake. What's the max runout for your rotors supposed to be?
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Old 09-16-2007, 11:39 PM   #16
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Default RE: vibration when braking

Checking the run out on a COLD rotor will not always show you worpage. Some times the rotors will look fine cold, but as soon as they get warm the runout will increase. My money is still on the rotors especially sense you replaced the pads with out turning the rotors. Pads and rotors ware together and an untrue surface and new pads will make for problems.
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Old 09-17-2007, 12:37 AM   #17
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Default RE: vibration when braking

wheel bearing can do that it would take a while before your tires wear funny. easiest way i found to see if its the rotor or wheel bearing is pull your pads out of one of them is alot thinner its either rotor or wheel bearing.rotors are tricky i had a brand new one act like it was worped i turned it replaced the pads did the same thing i found out it was out of blance it way it did that.yes torqueing the lug nuts is a must i walked out from a ford dealer here over that.shop manager said i was wasting there time torquing them. i told him do not speak to me again tell you read a shop manual go sit in your office and act like you know something.
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Old 09-18-2007, 11:09 AM   #18
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Default RE: vibration when braking

I SAY ROTORS, IF THEY HAVE BEEN TURNED THEY WARP AT THE FIRST PANIC STOP.
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Old 09-18-2007, 01:30 PM   #19
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Default RE: vibration when braking

but i checked the rotors and there under 5 thousands out. and i replaced the brake shoes and calipers over a year ago. i need to swap the rear tires to the front first, if it still does it then ill buy a set of rotors.
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Old 09-18-2007, 01:30 PM
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