Join Date: 03-22-2008
Location: dominican republic/Oslo, Norway
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Front brake calipers locking up
This did not happen to my CBR 954RR. i still have my 954 and it now has over 75,000km on it and runs flawless...except for some electrical gremlins. No, this happened to another bike i have. it's the most bizarre thing i've ever experienced and was wondering if anyone has ever heard of this before?
Well, it only took 5 months to finally figure it out, but, I found out the problem to my brembo brakes locking up. i was taking my bike to a mechanic here on the island to change the brake fluid, because i thought, incorrectly, they were locking up as a result of having old brake fluid. but before i even got 100 meters out of the parking lot, the front brakes locked up.
let me stop here and say that, when the front brakes lock up, it comes to such an abrupt stop that, you are nearly catapulted over the front handle bars. If it were to happen while going around a corner on wet pavement, it would cause the front tire to lock up immediately and the bike would immediately nose dive and you would run directly into the next lane. this could ruin your whole day, if, for example, there happened to be another car or truck coming in the opposite direction around the corner. it's one of the most bizarre things i've ever experienced ever on a motorcycle before. it made it scary and exciting at the same time.
When it happened this time, i was prepared! When they locked up yesterday, the bike came to an immediate stop. i immediately jumped off the bike and touched the front brake calipers; the left front brake caliper was steaming hot...like on fire hot! the left one was as cold as ice. Perfect...now i knew where the problem was, it was just a matter of finding out why this was happening. i kept on driving to puerto plata in order to get it to the mechanic's shop. the front brake, however, kept on locking up. this went on for about 15 minutes before it finally stopped and i could continue on.
When i got to the mechanic's shop, he took the front brake caliper apart and it turns out that, as a result of the bike being parked next to the ocean, the salt air has gotten into the brake caliper pistons and oxidized and corroded the pistons--blocking their ability to smoothly push out the brake shoes in and out, and returning back to their original position.
Further more, when they would heat up, they would begin pushing the pistons out on their own--this part i did not understand, nor do i understand it now? Why would they push the brake calipers out when i'm not engaging the front brakes? Bizarre.
Anyway, the mechanic, took them apart as best as possible and sprayed WD40 or some kind of brake cleaner and this seems to have worked. i drove it back without any problems.
Has anyone ever experienced this or know what the correct remedy to this is?