Rear Brake Problem - Randomly Locks Up

[Rdodds033]

i was out riding about a month ago on my 08 DS450 and my rear brake starts building up pressure until my motor almost stalls. i park it and touch the disk and it melts a hole in my glove. i pried apart the pads with a key and after that it was a little better. it happed about a week ago and then it happened today again. i tried bleeding my brakes but that didnt help. i think it might have something to do with the weather. 35F in the day and -10 at night. i try to leave my ds in the garage but somethimes i cant so it sits outside.

any ideas. its kinda urgent because i have to drive it to school in the mornings.

thanks in advance

[TNT]

Check the caliber piston for rust, scratches, leaks, check o-ring inside caliber holes. its probably sticking open and wont retract. Retract it to install pads after bleeding firmly depress pedal a few times to bring pad in contact w/the disc, check rear reservoir level and piston operation before driving. Check the rear master cylinder for proper operation, theres a retraction spring inside under the boot and two orings. Check the peddle for binding, theres a screw, washer, shim. Check the rotor for straightness....Dot 4 fluid, temp range is good.

Hope you find the prob....

[Mr. Big Time]

take the cap off the resovoir, and poke a little hole in the rubber.

[Rdodds033]

Originally posted by Mr. Big Time
take the cap off the resovoir, and poke a little hole in the rubber.

i already did that but thanks anyway

[Mr. Big Time]

that is weird, i've never heard of that happening before. I wonder why its doig that. Sorry I wasnt of any help

[Rdodds033]

do you think water or something could have gotten in the brake fluid and caused pressure to build up?

[nvrpmx]

If it gets over filled it can cause it also.

[bwkcobra03]

I am having the oppisit problem. My rear brake stops working intermittantly.

[railroader77]

same here my rear break is all but gone just one day it went all the way down with hardly any ride time.

[mebcop]

put a slit in the diaphram. for the guys with the rears that dont work.(no pedal). happened to both of mine within a week of eachother.