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Pulsating front brake level

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Pulsating front brake level

PostAuthor: Marko Sharko » Sat Jan 13, 2018 7:53 pm

My 81 750 is on the road after 18 months, has new break pads.
The front lever pulsates when braking.
When I push the Nike the rotor scraps the pad in one spot during the revolution of the wheel .
Could this be the issue? Can the disk be machined or does it need replacing?
Thanks

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Re: Pulsating front brake level

PostAuthor: bstig60 » Sat Jan 13, 2018 8:44 pm

The disk is warped. It will cost less to replace it. Used ones are available on Ebay. Here is the part number and the list of bikes that use the same disk.
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Re: Pulsating front brake level

PostAuthor: mark75 » Sat Jan 13, 2018 8:59 pm

you could have the disc turned by a machinist - minimum thickness is 4.5 mm (0.2")

if the disc is warped --- max deflection is 0.15 mm (0.006")

this info should be in your service manual. [downloadable (pdf) ones are available on site]
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Re: Pulsating front brake level

PostAuthor: Marko Sharko » Sun Jan 14, 2018 6:45 pm

bstig60 wrote:The disk is warped. It will cost less to replace it. Used ones are available on Ebay. Here is the part number and the list of bikes that use the same disk.

Can you please attach the list.

Thanks

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Re: Pulsating front brake level

PostAuthor: Hellgate » Sun Jan 14, 2018 7:22 pm

My guess is the rotor is glazed. Scrub it with Scotch Brite before you replace them.

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Re: Pulsating front brake level

PostAuthor: Flyingdog » Mon Jan 15, 2018 12:34 am

:yup:

Good idea before turning/or replacing rotors. Should also look at the flatness and cleanliness of your pads. But be aware.. oem pads are angled, don't do what some have and try to flatten the material parallel to the backing plate. Ruins your day real fast. Just because their fairly new, they're probly organic and will ball up with chunks of brake material and road debri. Making pads cock off just enough to make em feel squishy and wobbly. Specially since oem rotors are solid and don't do much clean/scraping the pads when applied. Not much you can do bout it unless you switch to slotted rotors and/or sintered pads. Which is kinda pricey since you should "only" use sintered pads with pure stainless steel rotors. Which Virago 'oem' rotors are not.
Oh yea, as you probly have noticed, be mindful of the mounting of those (Type I) single pin caliper systems.
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