rear brake rebuild on my mirage

rodbargee

rodbargee

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Location
North Yorkshire
Todays little helper
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Mot fail on back brake so new master cyl repair kit and new pads and caliper seals to go in though the LAverda Guru Neil @ laverda scozia says they were always marginal even when new as the master cyl volume was right on the ragged edge of having enough volume. suggested I FIND A NEW TESTER. He is prob right but happy to rebuild it anyhow. awkward getting the caliper off as its fowled by the swinging arm and the shock which was easier to remove rear wheel loosened and chain off allows just enough room to get the bolts off the calipur mounting CAsting. master cyl removed next, and millions of questions from my grand daughter who knows as much about rear brake discs as is good for a five year old. I have to say Ged Shorten who put this bike back together has done a first rate job everything well screwed together nothing iffy and nice touches like the spacer to keep the battery in place Its been thought about! Neil was really helpful when i ordered the bits for this, the parts arrived super quick and were all correct, makes a refreshing change.

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shock off and calliper and master cyl in this shot, also rear set disconnected from actuator just visible. going to try bleeding it on the bench and replace the piston seals on both wish me luck :geek:
 
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Definitely find another tester ! You need a sympathetic ear with a 30 to 40 year old bike and we should all have the sense to fit good tyres and good brake performance . The mot is there to weed out the unsafe stuff - recently several Formula owners had their brakes failed as the floating discs floated - that’s bonkers !

good luck !
 
The stock set up is marginal, at best. Brake will perform better if the M/C is actuated directly, without the cross-over linkage. M/C needs to be slightly re-positioned though. Will still need a hefty stomp and still won't tear the tyre off, about a 30% inprovement. Not much, but a lot more than nothing... ;)

piet
 
Grandaughter has the right idea, its all about leverage. Longer lever will help, but if you cant make one end longer, go shorter on the other end. Drop the rose joint into the lower hole a see if it makes a difference
 
you only have to loosen the rear wheel and move it slightly so that the rearmost cap screw of the master cylinder then lines up with a deliberate cut out to give it clearance, and then both screws come out a doddle, with long Allen keys and an extension tube.

If you are bleeding the system "off" the bike, remember to loosely bolt both units in place and link up the connecting hose, new or annealed copper washers, and then remove from the bike, if there is a need to even loosen the banjo's when fitting to the bike you will have lost the fluid pressure.

I have been trying to get a good rear brake on TOG for decades and so far failed, on 120's it is a very easy master cylinder swap with something Jap, Keith Nairn at laverda Scozia will advise I am sure, he invented that!, who is Neal? I road tested a Corsa few years ago so equipped, and have ever since been attempting to get TOG right, she is a series 1 Mirage TS, with long brake pedal, I will get there, but not quickly.

CLEM
 
Might be a good idea to move the brake lever above the horizontal , so when the tester applies pressure , maximum pressure will be achieved at the horizontal point or just past. Of course revert back when MOT finished.
 
CLEMTOG said:
you only have to loosen the rear wheel and move it slightly so that the rearmost cap screw of the master cylinder then lines up with a deliberate cut out to give it clearance, and then both screws come out a doddle, with long Allen keys and an extension tube.

If you are bleeding the system "off" the bike, remember to loosely bolt both units in place and link up the connecting hose, new or annealed copper washers, and then remove from the bike, if there is a need to even loosen the banjo's when fitting to the bike you will have lost the fluid pressure.

I have been trying to get a good rear brake on TOG for decades and so far failed, on 120's it is a very easy master cylinder swap with something Jap, Keith Nairn at laverda Scozia will advise I am sure, he invented that!, who is Neal? I road tested a Corsa few years ago so equipped, and have ever since been attempting to get TOG right, she is a series 1 Mirage TS, with long brake pedal, I will get there, but not quickly.

CLEM
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My bad typo I do of course mean Keith at Laverda scozia. I was kind of hoping the full refurb as described would be sufficient, without modification, was also wondering about changing the pin on the actuator lever, seems a bit loose
 
KERMIT1200 said:
Might be a good idea to move the brake lever above the horizontal , so when the tester applies pressure , maximum pressure will be achieved at the horizontal point or just past. Of course revert back when MOT finished.
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I am frankly surprised that he's been so strict on this the numbers on his modern brake tester seem to rule the roost and no discretion allowed he is of the vintage where back brakes were often like this, so what number does it have to hit there's little guidence.
 
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