Spongy brakes... help!
Posted 12 February 2006 - 04:02 PM
I have a 4 months old RM250 2006 bike, I havent done anything to my brakes since I bought it (they were awesome new). Since then she's been on tough hill climbs, riding in the rain, through mud holes you name it!
Anyway, the brakes started getting really spongy. My brother is a mechanic and he bled them using them by using a tube over the hole over the bleed nipple and squeezing the lever etc. I watched him and only brake fluid came out (ie no bubbles).
Anyway, my brakes were still spongy!
I went to the shop I bought it from and felt the brakes on the new RM's (same as mine) and they felt very strong.
And the pads/disc looks fine.
Anyone got any ideas? I nearly crashed on the weekend because I couldnt stop in time - I made friends with some bushes.
Posted 12 February 2006 - 04:42 PM
Also, get rid of those stock pads. Get some nice ones. Stockers are junk. Never liked them.
Posted 12 February 2006 - 04:46 PM
Empty ALL the fluid, get some fresh fluid (dot4), then do a reverse bleed of the system. You might as well take it to the shop they can do it for $30 in an hour. You need a reverse bleed tool. (like a pump).
Because you bleed from the caliper up, all the air MUST leave the system. Should make them as good as new.
Posted 12 February 2006 - 04:54 PM
Posted 13 February 2006 - 01:13 AM
Also, I am using fairly "kmart" variety dot4 fluid. Nothing fancy. And the stock pads worked well when it was new and arent anywhere near worn... so why should i need to replace them?
Is it normal for mud to be in the master cylinder? theres a little pouch thing in there that catches it, but it had a fairly large amount of muddy water up there!
I didnt want to bleed them from dry because it would take me 2 hours to level pump it full again!
Posted 13 February 2006 - 08:37 AM
Reverse bleed will make a difference. As for muddy water, sounds like the fluid broke down or something in the lines or caliper started to desolve a little. If the fluid broke down then you must bleed from dry. Or the broke down fluid will still keep the line squishy.
I'm guessing the fluid looked really nasty?
Posted 13 February 2006 - 02:22 PM
It just pisses me off because I like to go fast and then STOP hard before the corners. and its quiet dangerous having spongy front... But the stockers were good on the 06! As good as my brothers CR. But the CR lasts longer.
Posted 14 February 2006 - 04:36 AM
Posted 15 February 2006 - 07:21 PM
Posted 19 February 2006 - 01:03 AM