Brake bleeding issue Zontes Firefly 125cc 😤&

[Garymcc1]

Hi all, New to the forum and in need of help. My brother in law has one of these Chinese Zontes Fireflys. He had an off a few weeks back and I've since replaced the damaged parts but the rear brake won't hold pressure.

I've pumped fluid through it to no avail. I ordered a rear caliper and piston and the fault is still present. I've notice the servo piston runs a hose to the rear And front caliper for some reason. The front brake is 100% working but it has 2 bleed nipples one for the front and I assume 1 for the servo??

My question is how the hell do. You bleed these brakes I've never had an issue working on any bike I've owned but this little thing is baffling me and I just want it gone and back to him now. 😂 PLEASE SOMEONE help me.

[RhynoCZ]

Is this it?
https://images.medialinksonline.com/imagestream/268450/1934904x1200x800_FFFFFF_E.jpg

If so, it appears the front and rear brakes are joined, not uncommon (Honda used this on various bikes, DCBS), a bit unusual on such low budget 125cc bike though. It could also be the ABS system, but I can't see any ABS ring on the front wheel.

Read here: https://moto.lexp.net/wiki/Bleeding_the_Brakes_%28Dual_Combined_Brake_System_%28DCBS%29%29_on_Honda_CBR1100XX_Super_Blackbird
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Garymcc1]

Yes that's the one it's a 2017 model no Abs on them. How would I go about bleeding that type of system? Thanks so. Uch for getting back to me.

[RhynoCZ]

Read here: https://moto.lexp.net/wiki/Bleeding_the_Brakes_%28Dual_Combined_Brake_System_%28DCBS%29%29_on_Honda_CBR1100XX_Super_Blackbird

There's no other imaginable reason why would they join the brakes, other than a dual combined brake system.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Garymcc1]

Sorry I totally missed the link. Lol. I'll give it a go and hope it does the trick. Failing that I may have to give up or face going insane...... More so.

[RhynoCZ]

No need to be sorry.

If your model does not have such dual combined system, then you have air in the system, bleed it again. If it still doesn't hold ''pressure'' then it must be leaking, check for any moisture.

Could you make a picture of the rear caliper? Maybe the bleeding point is in not the ideal place (not on the top of the caliper), which is common, in which case reverse bleeding is advisable.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Garymcc1]

I'll get some. Pics up ASAP.

[Skudd]

If they are linked you will have a pressure valve at the front that actuates when the front brake is used and pushes the piston in the unit. This then pushes a piston on the rear. You will need to push this back and forth to bleed the rear. My Varadero 1000 had linked brakes and there was a sequence to bleeding them, not a one man job either.
It was a pain in the arse, but once done brilliant.
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Famous last words of Humpty Dumpty. " Stop pushing me "
Petty Anarchists look at "1984".............. The Visionary looks at "Animal Farm".

[Easy-X]

I've got CBS on the Superlight. I expect the Chinese thought "ABS sounds expensive, CBS sounds almost as good and it don't cost feck all!"
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter