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  #1  
Old 07-04-2017, 07:37 PM
KafkaKaffe KafkaKaffe is offline
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Sensation of pulsing brake when turning in on downward slope

SO Are my pads shot? Tires are in great shape. It does not always happen very disconcerting.
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Old 07-04-2017, 11:00 PM
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Re: Sensation of pulsing brake when turning in on downward slope

Quote:
Originally Posted by KafkaKaffe
SO Are my pads shot? Tires are in great shape. It does not always happen very disconcerting.
Are you applying the brakes when this happens?

Easy enough to check - as your pads wear the fluid level in the brake master cylinder starts to go down.

Visually inspect the pads - remove calipers and pull the pads.

Are the rotors warped or worn?

Also many times if nothing is worn - brake pad material builds up on the rotors causing this - take a scotch brite pad and clean the rotors both sides. May need a little more than a scotch brite pad be careful if using a drill.
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Old 07-04-2017, 11:06 PM
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Re: Sensation of pulsing brake when turning in on downward slope

Use some brake cleaning solvent spray with that scotch bright pad. And if it is brake pad deposit, you probably need new pads too.
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Old 07-05-2017, 03:24 AM
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Re: Sensation of pulsing brake when turning in on downward slope

Sounds like bad wheel bearing or loose wheel, when putting stress on the wheel when turning or leaning the rotors are having side movement and is forcing the rotors to push against the pads and not running true
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Old 07-05-2017, 05:15 AM
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Re: Sensation of pulsing brake when turning in on downward slope

What tires?
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Old 07-05-2017, 05:30 PM
KafkaKaffe KafkaKaffe is offline
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Re: Sensation of pulsing brake when turning in on downward slope

well used my stand to full effect today
gosh darned left side pad worn out but right within specs

so a set of pads and a search for what is likely a very expensive rotor.
is rotor warped we shall see
its not chewed up bad but its certainly compromised

Yah see I asked about this a few weeks back and forgot all about it
the joys of old age and forgetfullness.
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Old 07-05-2017, 06:01 PM
KafkaKaffe KafkaKaffe is offline
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Re: Sensation of pulsing brake when turning in on downward slope

OK can anyone tell me if 34217671881 has been superceded by 34218541388
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Old 07-05-2017, 09:06 PM
KafkaKaffe KafkaKaffe is offline
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Re: Sensation of pulsing brake when turning in on downward slope

Well bloody hell
same POS design as on my truck calipers
damned pins are seized

Dear lord has anyone done a writeup on how to seperate these things. They are a little too delicate to whale on with a hammer
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Old 07-06-2017, 10:13 AM
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Re: Sensation of pulsing brake when turning in on downward slope

Picture please so we are sure what you are talking about?
My "pins" on the K12 were stiff (not frozen hard) and I used a drift punch and hammer after wetting with WD40. Working them back and forth got them out with no damage. But I fully disassembled the calipers figuring if the pins were stiff the brake pistons were stiff too.
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Old 07-06-2017, 10:23 AM
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Re: Sensation of pulsing brake when turning in on downward slope

Same condition as in this write up
http://advrider.com/index.php?thread...enance.795539/

I applied heat gently and penetrating fluid
took quite a while and many whacks with a light hammer to free the damned thing
a little gnarly looking but in the process is pierced the boot on the big pin

oh well live and learn

Its shocking to me that the pins are not available it a damned rip off by the OEM.
400 bucks to fix a slide pin? really!

ANyway its likely cheaper to ebay a used caliper than even to buy the boot which is pretty hillarious,

One thing about the process a small hammer was more effective than a large one.

So what draws in moisture to the cavity when its sealed with a boot? Is it a constant cycling of hot air expanding then contracting thus drawing in a minuscule bit of moisture laden air and schmutz? Meh.
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Old 07-08-2017, 05:52 AM
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Re: Sensation of pulsing brake when turning in on downward slope

Quote:
Originally Posted by KafkaKaffe

So what draws in moisture to the cavity when its sealed with a boot? Is it a constant cycling of hot air expanding then contracting thus drawing in a minuscule bit of moisture laden air and schmutz? Meh.
Its not 100% sealed because in order for it to slide air has to escape and air has to be drawn in if it didn't the pin would not move. some pins have a channel to allow air to escape and drawn in, some have a tiny hole at the end of the pin bore or the bore to pin tolerance is sloppy enough to allow air movement. That boot is really just to keep dirt out and the pin lube is suppose to keep moisture from corroding the bore and pin. Every time you change the pads you "should" clean the pin and bore and use new lube.
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Old 07-08-2017, 06:06 PM
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Re: Sensation of pulsing brake when turning in on downward slope

SO being as I am a cheap bastard Ive been reading.
Point of departure was the assumption that another german bike that brembo supplies brakes for may use the same components

KTM has what look to be identical pins in a different bracket for the 350 EXC
the pins just like BMW are not available but a nice ktm forum shows pics of Honda XR650 pins that the KTM guys use apparently even the boots work

The sticky brembo pins is common across all cars and bikes they have a hand in
and no pins for sale just full calipers

Japanese superiority in customer satisfaction
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Old 07-08-2017, 07:42 PM
KafkaKaffe KafkaKaffe is offline
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Re: Sensation of pulsing brake when turning in on downward slope

damn the threaded bit on the small pin is 2mm or so shorter from the looks of things
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Old 07-08-2017, 08:23 PM
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Re: Sensation of pulsing brake when turning in on downward slope

Quote:
Originally Posted by KafkaKaffe
OK can anyone tell me if 34217671881 has been superceded by 34218541388

yes look here
http://parts.bmwmotorcycles.com/p/BM...217671881.html
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Old 07-20-2017, 07:13 PM
KafkaKaffe KafkaKaffe is offline
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Re: Sensation of pulsing brake when turning in on downward slope

Well tell me folks can rotor induce pulses back to the pedal if its not warped?
If not Im sure the rotor is warped and I have no runout gauge.

Its used OEM for me but what about these chinese rotors so heavily present on ebay?

Oh the swapping of the new parts was easy. It seems nothing freezes up in Texas least not slide pins.
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Old 07-21-2017, 09:54 AM
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Re: Sensation of pulsing brake when turning in on downward slope

If you want a quality non-BMW replacement rotor, I recommend EBC. They aren't cheap, but it beats chasing one's tail trying to figure out if what you bought is worse than what you had. As to pins, a halfway decent machinist could easily make them for you. Just sayin...? Good luck.
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Old 07-22-2017, 09:01 PM
KafkaKaffe KafkaKaffe is offline
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Re: Sensation of pulsing brake when turning in on downward slope

Last time I got a machinist to do work he charged 100 dllars to tap three holes in a cam tower cap that was 30 yrs ago
Machining here is not cheap by any means.
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Old 07-22-2017, 10:48 PM
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Re: Sensation of pulsing brake when turning in on downward slope

Quote:
Originally Posted by KafkaKaffe
Last time I got a machinist to do work he charged 100 dllars to tap three holes in a cam tower cap that was 30 yrs ago
Machining here is not cheap by any means.

You were robbed. Find another machinist and ask the price beforehand.
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Old 07-23-2017, 04:17 PM
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Re: Sensation of pulsing brake when turning in on downward slope

"Well tell me folks can rotor induce pulses back to the pedal if its not warped?
If not Im sure the rotor is warped and I have no runout gauge."

Yes, if there are pad binders deposited on the rotor, (you can not see this) it will pulse. Cleaning with Scotch bright pad and spray brake solvent will get them off, work both sides and seriously work it. You also have to replace the pads with fresh ones. Beemerboneyard sells the Carbone lorraine pads which are good also.
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  #20  
Old 07-27-2017, 11:01 AM
KafkaKaffe KafkaKaffe is offline
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Re: Sensation of pulsing brake when turning in on downward slope

Hmmm food for thought. There does seem to be a bit of buildup near the innermost part of the disc, Ill give it a go after all fedex lost my rotor temporarily.
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