OPPO Help: Bad Vibrations

"Agrajag" (Agrajag) 05/20/2015 at 21:55 • Filed to: w123, 240d

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Question for OPPO. Is there anything else besides uneven pad transfer fuckit im calling it warped rotor a warped rotor that would cause a significant pulsing of the brake pedal? No vibration is felt in the vehicle , only through the pedal. Thanks in advance.

This is for my 240D. I sure hope it’s not the front rotors. I’m not looking forward to replacing them.

dogisbadob > Agrajag 05/20/2015 at 21:58

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slotted and drilled rotors aren’t as good as blanks. Since the surface isn’t flat, it’s inherently uneven.

If only EssExTee could be so grossly incandescent > Agrajag 05/20/2015 at 21:59

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...That sounds an awful lot like ABS.

Joking aside, I had a warped rotor once and it induced pretty nasty vibrations in the steering wheel when braking from highway speeds. If your wheel feels fine, it’s probably either not a warped rotor or barely warped at all.

bhardoin > Agrajag 05/20/2015 at 22:05

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Only through the pedal? that’s weird. I’d guess brake booster has a leak or something. when idling, hit the brake, and carefully note if it changes engine RPM at all, if so that’s a vaccuum leak that could be giving you weird brake feel while your booster goes. I guess it could also be the rear (drums, on your 240?) mildly warped/uneven, and its just not severe enough for your to feel through the car’s suspension.

Agrajag > dogisbadob 05/20/2015 at 22:10

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Yeah, I have no desire to put cheese graters on.

Zipppy, Mazdurp builder, Probeski owner and former ricerboy > Agrajag 05/20/2015 at 22:10

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I’ve driven a car with a warped rotor, thankfully it wasn’t mine. There was shimmy in everything connected to the front wheels every time I braked. I have a feeling it could also be buildup of sorts if its not warped.

gmporschenut also a fan of hondas > Agrajag 05/20/2015 at 22:12

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http://www.popularmechanics.com/cars/how-to/a4…

Agrajag > If only EssExTee could be so grossly incandescent 05/20/2015 at 22:13

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I’ve never driven a car with the issue before, but had always heard you feel it in the steering wheel as well.

iSureWilll > Agrajag 05/20/2015 at 22:17

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Does the tempo of the pulse slow with vehicle speed or is it more impacted my engine speed? This should narrow it down to either beaker master cyl/booster like Bhardoin said OR a warped rotor or possibly a wheel bearing.

Agrajag > bhardoin 05/20/2015 at 22:17

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I’ll try that, thanks.

This car does have discs on the rear. ABS was even an option in 1982.

Agrajag > iSureWilll 05/20/2015 at 22:21

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I would say vehicle speed.

iSureWilll > Agrajag 05/20/2015 at 22:25

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Well I would check the wheel bearings and the rotors. A bend in a rim I would think would be felt in the wheel too even when not on the brakes so I doubt that is it. The only other thing that rotates with vehicle speed would be the wheel bearings and rotors. I've had a couple beers tonight so forgive my typing skills.

If only EssExTee could be so grossly incandescent > Agrajag 05/20/2015 at 22:26

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Do you have drum rears?

Big Bubba Ray > Agrajag 05/20/2015 at 22:27

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Get your rotors turned it you can. I don’t think it’s warped because you would be feeling it in the steering wheels under braking as well as in the brake pedal. If turning them doesn’t do the trick, you could have some other problems.

Agrajag > iSureWilll 05/20/2015 at 22:35

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Well since the rotor and bearing have to come off together, they will both get changed.

Agrajag > If only EssExTee could be so grossly incandescent 05/20/2015 at 22:36

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Discs on all corners.

If only EssExTee could be so grossly incandescent > Agrajag 05/20/2015 at 22:39

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If there’s no steering feedback it could be the rears maybe.

Agrajag > Big Bubba Ray 05/20/2015 at 22:39

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you could have some other problems.

cries

Agrajag > If only EssExTee could be so grossly incandescent 05/20/2015 at 22:40

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Good thinking.

greenagain > Agrajag 05/20/2015 at 22:49

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That’s probably your problem. If you don’t want to turn the rotors you can try a block and emery paper to re-scuff them.

Mechaniac > Agrajag 05/20/2015 at 22:54

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Warped rear rotors will induce a pedal only vibration in a car, trucks usually have leaf spring twisting that will shake the chassis. Here’s a way to check if you have a rear parking brake that uses the calipers. Get them hot because they will be more warped then accelerate just past a speed where it’s really bad and apply the parking brake only. If the rear rotors have an issue you feel it in the park brake pedal or handle also. If one doesn't have this type of parking brake but RWD one can jack the rear axle off the ground and alternate the throttle and brakes to see if can be duplicated or observed to be rotating erratically at a low speed. Also you can just stop on level ground and try to push the car, warped rotors will make this exceedingly difficult.

Agrajag > greenagain 05/20/2015 at 22:56

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I’ll just replace the rotors. God knows how long they’ve been on there.

brianbrannon > Agrajag 05/21/2015 at 10:19

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f

You can tell a Finn but you can't tell him much > Agrajag 05/21/2015 at 10:58

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Depends on if its the front or rear giving you issues. Rears you will feel through the pedal and your butt. Fronts you feel through the pedal and steering wheel.

Agrajag > You can tell a Finn but you can't tell him much 05/21/2015 at 11:40

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Hmm. There is no other indication other than through the pedal. Passengers have no idea. Thanks.