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05-20-2012, 05:02 PM | #1 | |
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Rear brakes pulsating after replacement
Recently replaced the rear drum brakes on my 2000 Windstar and they immediately started pulsating (no prior problems). The wheel cylinders were fine (not replaced) and the brakes were bled with no air found in the system and clean brake fluid throughout. Hubs and bearings look good - not bent, loose, or rough.
Thought the new drums were out of round so replaced them with more new ones - same problem. Then figured it was the cheaper aftermarket parts I got, so just replaced everything with brand new Ford Motorcraft parts - same problem. The pulsation happens under all braking conditions. I have isolated it to the rear brakes because it happens when applying the parking brake (which is also how I know it is not the ABS activating). I have also recently had an alignment and wheel balance done, so that cannot be the problem. Anyone else had this problem? What can cause it? I am stumped... Last edited by Topcga; 05-20-2012 at 05:04 PM. Reason: Update information |
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05-20-2012, 05:17 PM | #2 | |
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Re: Rear brakes pulsating after replacement
You have air in the system quite likely.
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05-20-2012, 05:21 PM | #3 |
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Re: Rear brakes pulsating after replacement
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05-20-2012, 05:29 PM | #4 | |
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Re: Rear brakes pulsating after replacement
I am going to try and bleed the brakes again and see if that is the problem. I guess I can see how air in the wheel cylinder could cause the shoe to be able to vibrate on and off the drum surface as the brake is applied, even if the parking brake lever is actually applying the pressure.
Given that I already bled the brakes at the time, I am doubtful this will resolve the issue, but it is a good idea. I will report back what I find. Thanks! |
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05-20-2012, 06:17 PM | #5 | ||
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Re: Rear brakes pulsating after replacement
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05-20-2012, 07:30 PM | #6 | |
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Re: Rear brakes pulsating after replacement
I had a similar problem.....van shook over 45mph.....was the brake drums........but you have already addressed that.
One other thing might be how the drums are secured.......maybe try removing each tire and then see if maybe 1 drum is very slightly crooked.......maybe hung up somehow. Would have to be very slight....otherwise you would feel it just driving. Another thing that comes to mind....at least it was true for my '96 Windstar.....the rear wheel bearings should be cleaned and re-packed now and then. I prefered to have that done for me....but one can do it on their own. They can develop a little extra play when low on grease. Something with the rust ridge that develops on the inside edge of the brake drum could cause this....but that does NOT apply to this particular situation....because new drums have not rusted yet.
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Moderator for Ford Windstar room only Links to my pictures, intended as an aid, not a replacement for, a good repair manual. 1996 3.8L Windstar http://www.flickr.com/photos/4157486...092975/detail/ 2003 Toyota Sienna pictures (not much there yet) http://www.flickr.com/photos/4157486...781661/detail/ |
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05-20-2012, 08:11 PM | #7 | |
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Re: Rear brakes pulsating after replacement
ok, so the first thing I'd do (after all the stuff you have done which would normally be "first") is put a pair of pinch pliers onto one of the brake lines to stop the flow of the brake fluid to that wheel cylinder. Now, carefully, go for a drive and put your foot on the brake. If the pulsation continues, switch sides and try again. Assuming that you can close off the side that the pulsation is coming from you'll at least be able to narrow down where the problem is. Could this problem be on both? Yep. If nothing happens, that's likely the case.
Bleeding brakes does sometimes take a few times so don't be surprised about that. Another thing you can look at is how are the new shoes wearing. I've made it common practice to "arc" the new shoes with a fairly aggressive file that I have knocking off the leading and trailing edge. This will naturally happen with use during the first 50 miles or so and your pulsation may just solve itself. Between the hose clamping diagnosis, extra bleeding and arcing, you should be able to remove the pulse..
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07-17-2013, 08:36 PM | #8 | |
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Re: Rear brakes pulsating after replacement
Hello topcga so did you solve this problem if yes how? Just have the same kind of problem with 01 windstar
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07-17-2013, 08:52 PM | #9 | |
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Re: Rear brakes pulsating after replacement
[quote=Topcga;6979161]Recently replaced the rear drum brakes on my 2000 Windstar and they immediately started pulsating (no prior problems). The wheel cylinders were fine (not replaced) and the brakes were bled with no air found in the system and clean brake fluid throughout. Hubs and bearings look good - not bent, loose, or rough.
Thought the new drums were out of round so replaced them with more new ones - same problem. Then figured it was the cheaper aftermarket parts I got, so just replaced everything with brand new Ford Motorcraft parts - same problem. The pulsation happens under all braking conditions. I have isolated it to the rear brakes because it happens when applying the parking brake (which is also how I know it is not the ABS activating). I have also recently had an alignment and wheel balance done, so that cannot be the problem. Anyone else had this problem? What can cause it? I am stumped...[/QUOTE Hi did u solve this problem? I've same kind of problem on my 01 windstar |
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07-17-2013, 09:58 PM | #10 | ||
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Re: Rear brakes pulsating after replacement
[quote=zra4ok;7050045]
Quote:
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07-17-2013, 10:04 PM | #11 | ||
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Re: Rear brakes pulsating after replacement
[quote=zra4ok;7050045]
Quote:
Sorry I can't give you a solution. Good luck! |
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The Following User Says Thank You to Topcga For This Useful Post: |
zra4ok (07-18-2013)
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07-18-2013, 12:46 AM | #12 | ||
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Re: Rear brakes pulsating after replacement
[quote=Topcga;7050053]
Quote:
So anyway thank you and ill let you know if its the backing plate |
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07-18-2013, 01:23 AM | #13 | ||
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Re: Rear brakes pulsating after replacement
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01-18-2017, 08:10 AM | #14 | |
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Re: Rear brakes pulsating after replacement
I'd bet the new drums were out of round. they needed to be turned. seems like all drums these days do this. I'd guess the plants in China just don't care. I had the same issue on my 2000 windstar. since my old drums weren't that worn I just put them back on and pulsing went completely away so I just took the new ones back. I recently replaced drum on a 2003 focus and it has pulsing, but wasn't real bad plus these are a pain to replace as the bearings are part of the drum, so I'm just putting up with and and it feels like over time they are getting rounded by wear.
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01-21-2017, 03:03 PM | #15 | ||
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Re: Rear brakes pulsating after replacement
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My check? (1)Lift the shoes and all hardware away from backing plate, (2)with cylinder still in place, grasp the pistons with first finger and thumb,...can piston-pair easily be move fore-aft? If not, if stuck, replacement is likely needed. (When replacing cylinders new, I open up and lube thoroughly all internal parts ... filling end seals with grease, also.) Good luck! |
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