OK - I installed a radial master cylinder on my DRZ. RJ gave it to me because it was busted as delivered from an ebay auction and wouldn't draw in any fluid. I replaced the piston and it works.
Kind of.
As I use it, and not entirely predictably, more and more pressure will build up in the brake line, causing the brakes to apply themselves. This seems to be associated with use of the front brake, but can build up without being used. This is bad.
I didn't do a full flush when I changed the master because I wasn't worried about building up so much heat as to get a spongy lever at the moment. Is it possible that the air in the line is expanding and causing the brakes to apply? Alternatively, I wonder if the master cylinder is allowing extra fluid in the line?
Has anybody experienced a problem like this before? I'd rather not order a new master, as I'm looking a little bit of a bill for that, but I don't want to ride it around to "test" unlikely solutions.
And to preempt the obvious - I'll be doing a full flush tonight.
When it comes to Ryan Jenkins, the story ends with me putting him in the wall.
2009 Speed Triple | 2006 DR-Z400SM | 1999 CBR600F4 | 1998 Jeep Cherokee
-Ginger
full flush and then come back... air in the lines is the only thing i could guess.
I Am Mike
4 wheels: '01 RAV4 (Formerly '93 Civic CX, '01 S2000, '10 GTI, '09 A4 Avant)
2 wheels: '12 Surly Cross-Check Custom | '14 Trek Madone 2.1 105 | '17 Norco Threshold SL Force 1 | '17 Norco Revolver 9.2 FS | '18 BMC Roadmachine 02 Two | '19 Norco Search XR Steel (Formerly '97 Honda VFR750F, '05 Giant TCR 2, '15 WeThePeople Atlas 24, '10 Scott Scale 29er XT, '11 Cervelo R3 Rival, '12 Ridley X-Fire Red)
No longer onyachin.
Full flush done. I'll probably ride around the block in an hour... or report back at the end of tomorrow. Work's only 3 miles away, so it's not a terrible test, and it's evoked the problem twice now. A few things seem different this time, maybe something worked.
:knock on wood:
When it comes to Ryan Jenkins, the story ends with me putting him in the wall.
2009 Speed Triple | 2006 DR-Z400SM | 1999 CBR600F4 | 1998 Jeep Cherokee
-Ginger
Alison had this exact problem on her Nighthawk 650. It was a while ago but I think I finally determined that it was a blocked hole somewhere in the MC. Her's would get so bad that it'd eventually stop her in the middle of the road. I completely dismantled and rebuilt the MC using lots of brakeclean and compressed air, then dismantled/cleaned the calipers, flushed the lines, and it solved the problem. There are some very small/tight spots in there so any little particle can cause a problem.
http://www.85xr.com
1985 Merkur XR4Ti Track Car
2013 Ford F-150 FX4 Ecoboost
E46 BMW 330Ci Sport 5spd
1973 Honda CL125S
1985 Honda CX500
2013 Arctic Cat 700 ATV
2017 Onewheel +
Cool, thanks, Pete. That's exactly what I'm experiencing... like, to a T. The master was sitting around in RJ's garage for a while, after sitting around in some ebay'ers parts box for a while... then went to me, where it sat in my house for a while before I installed it, so it's quite likely that some kind of contaminant could have gotten in there.
I rode it to work today after the full flush, but it's too soon to tell anything. It normally manifests itself after two to three shorts rides. It'd be great if whatever was causing it unproblemed itself, but I'm not holding my breath.
-Andrew, keeping his 8mm handy.
When it comes to Ryan Jenkins, the story ends with me putting him in the wall.
2009 Speed Triple | 2006 DR-Z400SM | 1999 CBR600F4 | 1998 Jeep Cherokee
-Ginger
Ginger Wrote:-Andrew, keeping his 8mm handy.
isn't it always? muahahahaha :lol:
I Am Mike
4 wheels: '01 RAV4 (Formerly '93 Civic CX, '01 S2000, '10 GTI, '09 A4 Avant)
2 wheels: '12 Surly Cross-Check Custom | '14 Trek Madone 2.1 105 | '17 Norco Threshold SL Force 1 | '17 Norco Revolver 9.2 FS | '18 BMC Roadmachine 02 Two | '19 Norco Search XR Steel (Formerly '97 Honda VFR750F, '05 Giant TCR 2, '15 WeThePeople Atlas 24, '10 Scott Scale 29er XT, '11 Cervelo R3 Rival, '12 Ridley X-Fire Red)
No longer onyachin.
Happened to my roommate's old DSM - master cylinder issue (although we didn't tear it apart to find out what part of the MC failed / was clogged.)
Why do people just post what they are thinking? Without thinking.
2012 Ford Mustang
1995 BMW 540i/A
1990 Eagle Talon TSI AWD
ViPER1313 Wrote:Happened to my roommate's old DSM - master cylinder issue (although we didn't tear it apart to find out what part of the MC failed / was clogged.)
Wuz UR bffs dsm mc fubar? omg.
1987 Oldsmobile Cutlass 442
I'm still lost - because I was too lazy to write "I don't know" and used an Internet acronym I now have a "bff" named Jill?? :dunno:
Why do people just post what they are thinking? Without thinking.
2012 Ford Mustang
1995 BMW 540i/A
1990 Eagle Talon TSI AWD
Wait, I just got it - you were trying to be funny and make fun of the fact that I said "IDK"
It was so unfunny I just got it.
ZOMG go figure.
Why do people just post what they are thinking? Without thinking.
2012 Ford Mustang
1995 BMW 540i/A
1990 Eagle Talon TSI AWD
Well, that was a small waste of money. I did a full flush, and it tried to kill me again. I totally disassembled it, cleaned it out with brakleen and compressed air, put it back together all lubed up and right-like (according to the FSM, even), did another full flush, and it still tried to kill me. I give up.
I took the original master off because one of the reservoir screws was seized in to the body... there's still fluid in it, though, and I'll be reinstalling it later today. Hopefully I can get the seized screw out so that I can order a replacement... I don't want to buy another master.
When it comes to Ryan Jenkins, the story ends with me putting him in the wall.
2009 Speed Triple | 2006 DR-Z400SM | 1999 CBR600F4 | 1998 Jeep Cherokee
-Ginger
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