rear master cylinder

Message

scottyni · #1 Post by **scottyni** » Thu Jun 18, 2009 9:21 pm

looking one of these.

it's dead!!

offers on a postcard

minime · #2 Post by **minime** » Fri Jun 19, 2009 8:15 am

on Ebay regularly. Search for Brembo and Aprilia (or ducati).

FlyingKiwi · #3 Post by **FlyingKiwi** » Fri Jun 19, 2009 8:58 am

make an offer to beckh

https://www.ridersite.com/viewtopic.php?t=4934

beckh · #4 Post by **beckh** » Fri Jun 19, 2009 7:20 pm

har,har,har,har !! Wait till the wreck arrives though

scottyni · #5 Post by **scottyni** » Fri Jun 19, 2009 10:13 pm

the sizes can differ 11mm 13mm what does that refer too?? the dia of the fluid chamber?? i think

HowardQ · #6 Post by **HowardQ** » Mon Jun 22, 2009 12:02 pm

There were some larger bore units available as an upgrade, but can't remember who made them. Allegedly they actually made the rear brake work, a novelty for Aprilia. Can't remember the size of either the standard units or the upgraded.
Did spend most of Saturday fitting new rear pads and trying to bleed mine, to try and improve it.
Fitted new sintered pads, cleaned it all up thoroughly and decided I would change the fluid and run all the old stuff though.
I was on my own, so fitted the calipers back on loosely started bleeding with the calipers on, that way I had one hand for the pedal and one for the bleed nipple. As has been mentioned on here before, there is no real chance this way as the bleed nipple is at the bottom and all the air stays at the top.
Took it off and held the caliper in hand number one, (complete with a piece of metal held between the pads, to stop the pistopns pushing out), hand number two worked the ring spanner on the nipple, hand number three worked the brake pedal and hand number four made sure the bleed pipe stayed in the jar and did not spray brake fluid over the bike.
It took me three hours to work out that I was never going to do this with just two hands, most time was spent trying the hold tha caliper in my left hand so the nipple was at the highest point, plus operating the spanner and holding the pipe, leaving my right hand to work the pedal.
My mates were all out and the wife and daughter were out shopping, so just kept trying on my own .
Did it in about 10 mins when the wife got home! Doh!

Only finally got all the air out, when I could make sure that the bleed nipple was at the highest point and the wife gave the pedal a few hard shoves (?) to get the air out.

It's a pain if you've never done it before and is a two man job, unless you have specialist bleeding kit.

The good news is that I can now feel some retardation when I use the brake, mainly down to the sintered pads I think. You would never get near locking a rear wheel, but it's the best it has been over the last 5 years!

Fausto · #7 Post by **Fausto** » Mon Jun 22, 2009 2:37 pm

I'm undecided as to whether a strong rear brake is all that desirable. After all the harder you need to brake the less you need the rear anyway and if you do lock it then that could just get you into more trouble.

At MOT time I watch the fella place the rear wheel on the rollers and apply the rear brake and it passes the test so presumably offers an acceptable level of braking power.

I use the rear as well as the front brakes most of the time and presumably it is helping me keep things balanced but it's nice to know I don't need to worry about it locking up. It certainly works well enough for those tricky foot up u turns.

wavey · #8 Post by **wavey** » Mon Jun 22, 2009 3:58 pm

France, Vosges mountains, heavy rain, downhiil, hairpin, COBBLES!.... Yes a rear brake comes in handy

Dave

HowardQ · #9 Post by **HowardQ** » Mon Jun 22, 2009 4:14 pm

Never use my rear brake all that much with the Falco, (use it all the time on my old CBR1000 with combined brakes), but it is nice to have an option. I have to go down a very steep hill to my house at the bottom and all the surface gravel they put on the road, when the re-surfaced a few years ago, is now all loose at the bottom of the Cul-de-sac outside my house, so you don't want to be relying on just the front!
Also sometimes nice to have it if you come into a corner a bit quick and want to trail the rear brake a bit to knock some speed off.

Fausto · #10 Post by **Fausto** » Mon Jun 22, 2009 4:38 pm

Agreed on both the above comments.

I'm not advocating removal of the rear brake. More that we don't want it too powerful.