Honda ST1300 Section > Brakes & Clutch ST1300

Spongy Rear Brake

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HONK:
Well circumstances and changing responsibilities have decided for me that its time to part with the mighty 1300.
But I cant honestly hand it on to anyone else with an erratically spongy brake pedal. if I bleed the system the pedal feel will be ok for anything from a few months to a couple of days. Strange thing is if the front brake is activate the pedal is rock hard.
Does anyone have a clue as to the probable cause.my friends think my cologne is DOT4 I have used so much of the stuff.
I have used a vacuum kit in the correct order and also the one man bleeding aid that supercheep sell.
I have put new seels in the rear calliper and fitted a new master cylinder.
Could the problem be in the secondary master cylinder?
Cheers
Honk     

alans1100:
Not sure about the 1300 CBS system as it's a little different to the 1100 version.


The pressure control valve (PCV) needs bleeding where the 1100A doesn't and the secondary master needs to be in certain position when bleeding. It doesn't say in the manual to remount the LH front Calliper after bleeding the PCV but I would think that you need to before doing the rest of the bleeding.

1300 secondary master position when bleeding the PCV and I would suggest placing something in the calliper prevent the pistons from working.

HONK:
Done this so many times that I have a dedicated piece of pink string to tie up the front left calliper that is kept wrapped around the slab of plastic that I use to chock between the brake pads.

Gadget:
Have you put new seals in the front as well?
The combined braking system means some pressure is applied to the front cylinders. Maybe it is leaking air back in through the front seals.

tding:
check the secondary master cylinder

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